California Well Drillers Directory
Every company that appears as the driller of record in the California Department of Water Resources (DWR) Well Completion Reports database, ranked by the number of wells they have drilled. 1,104 California drilling companies account for 563,563 logged wells. Each profile shows the counties a company works, its well characteristics, and links to its original drilling logs — all drawn directly from the state record.
1,104drilling companies
228active since 2022
563,563wells on record
Companies with at least 25 wells on record. "Active" counts wells completed since 2022.
| # | Company | Wells | Since 2022 | Counties | Most recent |
|---|---|---|---|---|---|
| 1 | Peters Drilling And Pump Service | 11,575 | 717 | 13 | 2026-09-17 |
| 2 | Masellis Drilling Inc. | 6,093 | 640 | 10 | 2026-09-14 |
| 3 | J & H Drilling Co. Inc. | 994 | 497 | 17 | 2026-07-24 |
| 4 | Weeks Drilling And Pump Co. | 14,795 | 486 | 16 | 2026-09-02 |
| 5 | Sullivan Drilling Inc. | 1,390 | 483 | 17 | 2026-08-31 |
| 6 | Big River Drilling LLC | 721 | 466 | 6 | 2026-08-12 |
| 7 | Farwest Corrosion Control Company | 2,667 | 431 | 26 | 3003-05-23 |
| 8 | Fisch Brothers Drilling, Inc. | 6,397 | 428 | 10 | 2026-09-14 |
| 9 | Scott Belknap Well Drilling Inc. | 1,141 | 401 | 7 | 2026-07-24 |
| 10 | Cascade Drilling LP | 830 | 400 | 30 | 2026-07-31 |
| 11 | Gregg Drilling LLC | 564 | 381 | 36 | 2026-07-10 |
| 12 | Prieto Anthony J Water Well Drilling Inc. | 645 | 378 | 8 | 2026-09-14 |
| 13 | Strickland Enterprises Inc. | 2,026 | 348 | 8 | 2025-09-29 |
| 14 | Guardino Well Drilling Inc. | 1,756 | 344 | 18 | 2026-09-03 |
| 15 | American Construction And Supply Inc. | 1,697 | 325 | 42 | 2026-09-04 |
| 16 | Stehly Brothers Drilling Inc. | 2,204 | 302 | 4 | 2026-08-26 |
| 17 | Filipponi-Thompson Drilling Inc. | 2,135 | 284 | 6 | 2026-08-20 |
| 18 | Bradley & Sons Inc. | 3,631 | 278 | 18 | 2026-09-15 |
| 19 | Canepa And Sons Inc. | 3,178 | 255 | 40 | 2026-09-03 |
| 20 | Shasta Drilling Inc. | 743 | 255 | 4 | 2026-09-16 |
| 21 | Parks Water Resources | 391 | 247 | 11 | 2026-08-21 |
| 22 | Calwater Drilling Company Inc. | 5,429 | 237 | 13 | 2026-09-04 |
| 23 | Gary C Tanko Well Drilling Inc. | 12,026 | 235 | 12 | 2029-12-19 |
| 24 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | 1,721 | 203 | 35 | 2026-09-01 |
| 25 | W. S. Heitman Drilling & Pumps | 628 | 194 | 7 | 2026-08-07 |
| 26 | L O Lynch Quality Wells & Pumps Inc. | 3,374 | 193 | 6 | 3016-03-30 |
| 27 | Quality Well Drillers Inc. | 3,526 | 192 | 9 | 2026-08-18 |
| 28 | Castle Well Drilling Inc. | 294 | 192 | 6 | 2026-06-17 |
| 29 | A B C Liovin Drilling Inc. | 1,282 | 190 | 25 | 2026-03-06 |
| 30 | American Well Drilling And Pump Service | 440 | 190 | 6 | 2026-09-11 |
| 31 | Valley Well Drilling LP | 421 | 189 | 12 | 2026-09-15 |
| 32 | Living Water Well Drilling | 448 | 187 | 9 | 2026-09-12 |
| 33 | Haynes & Sons Well Drilling | 1,244 | 184 | 4 | 2026-08-28 |
| 34 | Yellow Jacket Drilling Services LLC | 296 | 180 | 15 | 2026-05-20 |
| 35 | Arsenal Well Drilling Inc. | 234 | 180 | 11 | 2026-05-24 |
| 36 | Johnson Drilling Co. | 11,872 | 176 | 38 | 2026-09-11 |
| 37 | Corrpro Companies Inc. | 737 | 176 | 28 | 2026-02-06 |
| 38 | Maggiora Bros Drilling Inc. | 4,676 | 170 | 34 | 2026-07-13 |
| 39 | Rumsey / Lang Well Drilling & Pumps Inc. | 734 | 170 | 2 | 2026-09-16 |
| 40 | 99 Drilling LLC | 265 | 167 | 6 | 2025-11-18 |
| 41 | Diamond Core Drilling Inc. | 480 | 166 | 14 | 2026-07-24 |
| 42 | Les Petersen Drilling & Pump Inc. | 4,098 | 165 | 7 | 2026-08-20 |
| 43 | Huckfeldt Well Drilling Inc. | 1,883 | 164 | 8 | 2026-09-08 |
| 44 | Good Earthkeeping Organization Inc. | 163 | 163 | 1 | 2025-11-11 |
| 45 | Earth Flow Drilling Company | 2,194 | 160 | 5 | 2029-03-14 |
| 46 | Horner & Sons Inc. | 352 | 157 | 2 | 2026-08-31 |
| 47 | Miller Drilling Co. | 1,778 | 156 | 9 | 2026-09-10 |
| 48 | Well Industries Inc. | 559 | 154 | 34 | 2026-08-14 |
| 49 | Irwin Well Drilling | 1,907 | 144 | 7 | 2026-08-24 |
| 50 | Wellco Drilling Inc. | 1,384 | 144 | 4 | 2026-09-03 |
| 51 | Consolidated Testing Laboratories Inc. | 1,406 | 139 | 12 | 2026-09-09 |
| 52 | H & B Drilling And Sons LLC | 414 | 136 | 13 | 2026-07-03 |
| 53 | Rich Well Drilling & Pump Service Inc. | 371 | 135 | 4 | 2026-05-19 |
| 54 | Heritage Well Service | 528 | 129 | 4 | 2025-05-08 |
| 55 | North American Drilling Company | 695 | 128 | 5 | 2026-08-23 |
| 56 | Grabow Well Drilling Company | 2,651 | 121 | 8 | 2028-03-30 |
| 57 | Bar - H Well Drilling Inc. | 202 | 121 | 1 | 2026-09-17 |
| 58 | Yosemite Falls Inc. | 708 | 119 | 11 | 2026-07-08 |
| 59 | Camp S A Pump Company | 498 | 112 | 7 | 2026-08-31 |
| 60 | Superior Pump & Drilling Inc. | 373 | 111 | 2 | 2026-09-11 |
| 61 | Hennings Bros Drilling Co. Inc. | 6,824 | 108 | 14 | 2026-08-10 |
| 62 | Triangle Well Drilling | 2,896 | 106 | 5 | 2026-08-25 |
| 63 | Fisch Drilling And Pump Inc. | 665 | 104 | 9 | 2026-08-19 |
| 64 | Gregory Drilling Incorporated | 143 | 103 | 27 | 2026-04-02 |
| 65 | Central Valley Well Drilling & Pumps LLC | 102 | 102 | 3 | 2026-05-29 |
| 66 | B & B Well Drilling Incorporated | 391 | 101 | 5 | 2026-08-20 |
| 67 | Arthur & Orum Well Drilling Inc. | 3,219 | 99 | 16 | 2025-06-12 |
| 68 | Eagle Well Drilling & Pump Service | 545 | 98 | 4 | 2026-09-14 |
| 69 | Bc2 Environmental LLC | 435 | 97 | 18 | 2026-05-23 |
| 70 | Wildrose Drilling LLC | 102 | 97 | 20 | 2025-10-14 |
| 71 | B L Grant Inc. | 192 | 96 | 3 | 2026-07-29 |
| 72 | Fain Drilling & Pump Co. Inc. | 3,030 | 93 | 8 | 2026-08-27 |
| 73 | Myers Brothers Well Drilling Inc. | 2,865 | 92 | 28 | 2025-09-27 |
| 74 | Environmental Control Associates | 277 | 92 | 9 | 2025-04-17 |
| 75 | C R Well Drilling | 457 | 90 | 6 | 2026-08-19 |
| 76 | Kings River Drilling LLC | 194 | 87 | 3 | 2026-08-03 |
| 77 | Enloe Drilling And Pumps Inc. | 443 | 85 | 8 | 2025-12-30 |
| 78 | Bruce Mackay Pump & Well Service Inc. | 261 | 83 | 10 | 2026-08-13 |
| 79 | A & M Well Drilling Inc. | 147 | 83 | 1 | 2026-09-10 |
| 80 | Wallis Water Systems | 688 | 81 | 4 | 2025-12-08 |
| 81 | A-1 Drilling & Pump | 222 | 81 | 5 | 2026-08-18 |
| 82 | Dechenne Water Well Drilling Inc. | 1,204 | 79 | 5 | 2024-04-24 |
| 83 | Vics Well Drilling Inc. | 337 | 73 | 17 | 2026-06-09 |
| 84 | Geocentric Drilling Inc. | 81 | 73 | 8 | 2026-05-15 |
| 85 | Sebastian Valente | 71 | 71 | 2 | 2026-09-14 |
| 86 | Tanko Well Drilling | 3,311 | 70 | 10 | 2026-04-08 |
| 87 | Granite Drilling Company | 480 | 68 | 6 | 2026-09-11 |
| 88 | M L Well Drilling And Pumps Co. | 411 | 68 | 3 | 2023-03-31 |
| 89 | Maier & Dougherty Pump & Supply Inc. | 241 | 68 | 3 | 2026-04-20 |
| 90 | Briski Well Drilling Co. | 2,751 | 66 | 7 | 2026-08-14 |
| 91 | Walt Bannon Drilling Inc. | 2,500 | 66 | 9 | 2026-09-03 |
| 92 | Conners Well Drilling | 154 | 65 | 4 | 2026-09-04 |
| 93 | Pacific Coast Well Drilling Inc. | 338 | 64 | 19 | 2026-08-15 |
| 94 | Will Peterson Well Drilling | 173 | 59 | 4 | 2024-12-12 |
| 95 | All American Drilling Inc. | 145 | 59 | 4 | 2026-08-15 |
| 96 | T S A Drilling Inc. Dba Penecore Drilling | 582 | 57 | 20 | 2026-07-31 |
| 97 | Your H20 Pro | 58 | 57 | 7 | 2026-07-08 |
| 98 | Business Midstate Drillers | 119 | 56 | 3 | 2026-09-08 |
| 99 | Pitcher Services LLC | 117 | 55 | 17 | 2026-07-02 |
| 100 | Coast Drilling Inc. | 278 | 54 | 4 | 2026-06-01 |
| 101 | Eaton Drilling Co. LLC | 3,792 | 51 | 35 | 2024-06-21 |
| 102 | Mickelson Enterprises Inc. | 175 | 51 | 4 | 2026-09-02 |
| 103 | Stonehouse Well Drilling | 157 | 51 | 24 | 2026-07-26 |
| 104 | Water Well Service Inc. | 146 | 51 | 11 | 2026-07-22 |
| 105 | Jensen Kelin Drilling | 94 | 51 | 12 | 2026-07-02 |
| 106 | Southern California Well Service LLC | 51 | 51 | 6 | 2026-07-07 |
| 107 | Torrent Resources CA Incorporated | 54 | 50 | 2 | 2026-03-10 |
| 108 | King Pump And Well, Inc. | 50 | 50 | 4 | 2026-08-29 |
| 109 | Clear Heart Drilling Inc. | 694 | 49 | 15 | 2025-02-26 |
| 110 | Taylor Drilling And Pump Inc. | 342 | 49 | 3 | 2026-06-15 |
| 111 | Signal Drilling Company | 8,301 | 47 | 37 | 2029-12-26 |
| 112 | Well Tec Services Inc. | 126 | 47 | 4 | 2026-07-24 |
| 113 | Daugherty Pump & Drilling | 122 | 47 | 3 | 2026-07-07 |
| 114 | Rodrigues Pump Company | 63 | 47 | 2 | 2026-07-20 |
| 115 | Chambers D P Drilling | 488 | 46 | 4 | 5302-03-01 |
| 116 | Mazzi Well Drilling | 210 | 46 | 2 | 2026-06-01 |
| 117 | Altamont Water Well And Pump | 90 | 46 | 6 | 2026-03-30 |
| 118 | Chambers Choice Drilling | 75 | 46 | 3 | 2026-08-31 |
| 119 | Big'n & Son Drilling Inc. | 46 | 46 | 3 | 2026-06-05 |
| 120 | Goodell Well & Pump Service | 342 | 45 | 6 | 2026-06-09 |
| 121 | Layne Christensen Company | 2,363 | 44 | 38 | 2026-07-24 |
| 122 | Martell Water Systems Inc. | 1,094 | 44 | 23 | 2026-03-25 |
| 123 | Hch Water Wells Inc. | 44 | 44 | 6 | 2026-07-15 |
| 124 | Kvilhaug Drilling & Pump Inc. | 328 | 43 | 20 | 2026-05-15 |
| 125 | R & M Water Well Drilling & Pumps Inc. | 91 | 43 | 5 | 2025-04-15 |
| 126 | DL Well Drilling | 43 | 43 | 3 | 2026-09-03 |
| 127 | Drew & Hefner Well Drilling | 43 | 43 | 6 | 2026-05-02 |
| 128 | Detray Drilling | 468 | 42 | 2 | 2025-09-19 |
| 129 | Nor - Cal Pump & Well Drilling Inc. | 250 | 42 | 27 | 2026-06-17 |
| 130 | MC Lean & Williams Inc. | 831 | 41 | 4 | 2026-07-21 |
| 131 | Best Drilling And Pump Inc. | 248 | 41 | 13 | 2026-08-10 |
| 132 | South Valley Pump & Drilling | 69 | 41 | 10 | 2026-07-14 |
| 133 | Waters Backhoe & Dozer Service | 112 | 40 | 5 | 2026-08-26 |
| 134 | Keller Drilling And Pump | 51 | 40 | 6 | 2025-12-10 |
| 135 | J & O Well Drilling | 159 | 39 | 8 | 2026-03-27 |
| 136 | Dierkop Paul | 79 | 39 | 1 | 2026-04-29 |
| 137 | Slagle Drilling Corp | 45 | 39 | 2 | 2023-02-27 |
| 138 | Bryant Pump & Drilling Company | 1,000 | 37 | 10 | 2025-11-24 |
| 139 | Cascade Well Co. | 371 | 37 | 3 | 2025-12-16 |
| 140 | Dos Palos Well Drilling | 788 | 34 | 5 | 2025-11-24 |
| 141 | Blaine's Well Drilling | 55 | 33 | 5 | 2026-07-20 |
| 142 | National Corrosion | 33 | 33 | 6 | 2026-09-09 |
| 143 | Mcquoid Well Drilling Inc. | 33 | 33 | 1 | 2026-08-24 |
| 144 | Kurt Lingemann Well Drilling | 540 | 32 | 2 | 2026-06-11 |
| 145 | Pacific Coast Well & Pump Inc. | 183 | 32 | 9 | 2026-06-26 |
| 146 | Top Hat Well Drilling | 32 | 32 | 8 | 2026-09-02 |
| 147 | Bess D Pump & Well Elect | 359 | 31 | 5 | 2025-04-08 |
| 148 | Scotty's Well Drilling | 140 | 31 | 1 | 2026-05-27 |
| 149 | Oasis FG Drilling | 60 | 31 | 4 | 2026-03-20 |
| 150 | HP Water Systems Inc. | 56 | 31 | 3 | 2026-07-07 |
| 151 | Water Resource Heritage Inc. | 33 | 31 | 3 | 2024-04-12 |
| 152 | Precision Well Drilling Inc. | 189 | 30 | 2 | 2025-12-04 |
| 153 | Samuel's Drilling | 39 | 30 | 2 | 2026-01-28 |
| 154 | Trinity Drilling Inc. | 36 | 30 | 4 | 2026-07-17 |
| 155 | D & D Drilling Inc. Dba Valley Drilling Co. | 1,282 | 29 | 9 | 2025-11-12 |
| 156 | Smith's Pumps Inc. | 98 | 29 | 3 | 2026-08-14 |
| 157 | Crisp Well Drilling | 35 | 29 | 3 | 2026-08-21 |
| 158 | Sierra Exploration Drilling Co. Inc. | 803 | 28 | 6 | 2026-06-22 |
| 159 | Fredrick Mark Pump & Supply Co. | 297 | 28 | 8 | 2026-08-26 |
| 160 | Matthew Davis Enterprises Inc. | 40 | 28 | 5 | 2026-07-03 |
| 161 | Hearn Ritchison Drilling LLC | 28 | 28 | 1 | 2026-08-22 |
| 162 | Farm Pump And Irrigation Company Inc. | 451 | 27 | 13 | 2026-07-15 |
| 163 | Crw Drilling | 27 | 27 | 2 | 2026-08-31 |
| 164 | Southwest Pump & Drilling Inc. | 292 | 26 | 8 | 2026-07-02 |
| 165 | A Z C A Drilling & Pump Inc. | 171 | 26 | 5 | 2026-08-04 |
| 166 | Solomon Well Drilling & Pump Service Inc. | 194 | 24 | 1 | 2023-09-14 |
| 167 | Tri County Drilling And Pump | 117 | 24 | 2 | 2026-05-20 |
| 168 | Barba Drilling | 51 | 24 | 2 | 2026-05-25 |
| 169 | Bertram Drilling Inc. | 1,171 | 23 | 33 | 2026-01-20 |
| 170 | Superior Well Service | 327 | 23 | 5 | 2026-02-02 |
| 171 | Valley Pump & Motor Works Inc. | 181 | 23 | 11 | 2025-08-27 |
| 172 | Diversified Drilling | 82 | 23 | 5 | 2023-07-30 |
| 173 | Myers Well Drilling Inc. | 763 | 22 | 9 | 2024-03-22 |
| 174 | Purviance Drillers Inc. | 663 | 22 | 7 | 2025-10-31 |
| 175 | Drill Hog | 75 | 22 | 5 | 2026-08-18 |
| 176 | Garrison Brothers Well Service | 46 | 22 | 4 | 2025-07-23 |
| 177 | Rindahl Drilling | 110 | 21 | 5 | 2025-05-06 |
| 178 | D & D Pumps | 46 | 21 | 3 | 2025-03-28 |
| 179 | C J Logan Pump & Electric Inc. | 35 | 21 | 2 | 2026-07-30 |
| 180 | Jak Drilling And Pump | 62 | 20 | 2 | 2023-12-29 |
| 181 | Landino Drilling Co. | 151 | 19 | 7 | 2026-07-13 |
| 182 | MC Quoid Well Drilling | 137 | 19 | 1 | 2023-02-16 |
| 183 | Confluence Environmental Inc. | 65 | 19 | 7 | 2025-06-02 |
| 184 | Hansen-Welldo-Service Inc. | 138 | 18 | 3 | 2026-04-20 |
| 185 | Mid State Pump And Drilling | 74 | 18 | 9 | 2025-05-29 |
| 186 | Chico Construction Inc. | 67 | 18 | 2 | 2026-06-11 |
| 187 | Abundant Water Wells | 173 | 17 | 6 | 2023-12-06 |
| 188 | Phifer Well Service | 38 | 17 | 5 | 2026-07-20 |
| 189 | Anthony J Prieto | 2,330 | 16 | 8 | 2023-02-24 |
| 190 | Chancellor Drilling & Pump | 41 | 16 | 3 | 2024-10-14 |
| 191 | Roadrunner Drilling & Pump Company Inc. | 205 | 15 | 24 | 2026-05-01 |
| 192 | Krazan & Associates | 30 | 15 | 7 | 2025-10-13 |
| 193 | Koenig Drilling | 39 | 14 | 3 | 2026-06-23 |
| 194 | Barbour Well Inc. | 32 | 14 | 6 | 2025-08-19 |
| 195 | Condon-Johnson & Associates Inc. | 25 | 14 | 3 | 2024-10-10 |
| 196 | Lundigan Drilling | 179 | 13 | 2 | 2025-12-11 |
| 197 | Fred Ash & Sons Lynch Pump Co. | 118 | 13 | 4 | 2026-05-27 |
| 198 | Palm Springs Pump Inc. | 115 | 13 | 6 | 2025-11-11 |
| 199 | Lackey Drilling | 41 | 13 | 2 | 2025-02-14 |
| 200 | Frank's Well Driling | 740 | 12 | 3 | 2024-08-13 |
| 201 | Hearn Drilling Co. | 492 | 12 | 4 | 2022-11-29 |
| 202 | Dougherty Pump & Drilling Inc. | 486 | 12 | 3 | 2024-11-19 |
| 203 | Loverin Pump & Drilling Co. | 62 | 12 | 2 | 2025-09-20 |
| 204 | Sar Construction | 47 | 12 | 4 | 2025-10-28 |
| 205 | Mel Meyer | 101,127 | 11 | 56 | 9999-09-09 |
| 206 | Thomas Murphy Pump & Well | 55 | 10 | 1 | 2025-12-11 |
| 207 | J W Morrison Inc. | 39 | 10 | 2 | 2025-05-23 |
| 208 | Diamond Well & Pump Inc. | 27 | 10 | 4 | 2026-08-10 |
| 209 | DE LA Grange & Sons Inc. | 263 | 9 | 11 | 2024-09-19 |
| 210 | Donald C Vickery Well Drilling | 150 | 9 | 3 | 2024-10-09 |
| 211 | Westervelt Well Drilling | 122 | 9 | 5 | 2024-03-31 |
| 212 | Henry George Farnsworth | 43 | 9 | 1 | 2025-07-11 |
| 213 | Seebeck M E | 568 | 8 | 10 | 2026-07-24 |
| 214 | Taber Drilling | 87 | 8 | 6 | 2025-07-24 |
| 215 | Clouser Drilling Incorporated | 36 | 8 | 2 | 2026-07-06 |
| 216 | Terawatt Construction | 26 | 8 | 1 | 2026-07-29 |
| 217 | Exploration Geoservices Inc. | 956 | 7 | 16 | 2026-07-22 |
| 218 | Enloe Well Drilling | 279 | 7 | 8 | 2026-04-22 |
| 219 | Pacific Coast Drilling | 262 | 7 | 12 | 2023-04-05 |
| 220 | Tanko Bros Inc. | 2,617 | 6 | 13 | 2022-05-11 |
| 221 | Maranatha Drilling And Pump Service | 307 | 6 | 6 | 2025-04-15 |
| 222 | Vannucci Technologies | 66 | 6 | 5 | 2023-01-31 |
| 223 | Sargent Drilling | 442 | 5 | 14 | 2022-07-11 |
| 224 | Michael Scott Lincicum Well Drilling Pump Installation | 304 | 5 | 2 | 2023-07-10 |
| 225 | V T S Drilling LLC | 92 | 5 | 6 | 2022-11-04 |
| 226 | Heuer Well Drilling | 62 | 5 | 2 | 2024-10-21 |
| 227 | Britton Exploration | 36 | 5 | 6 | 2026-05-01 |
| 228 | Petro - Lud Inc. | 26 | 5 | 4 | 2024-01-19 |
| 229 | Fred Ash & Sons | 1,217 | 4 | 5 | 2028-02-24 |
| 230 | National E W P Inc. | 431 | 4 | 28 | 2023-06-12 |
| 231 | Grade Drilling Co. | 43 | 4 | 7 | 2022-09-01 |
| 232 | Pro-H20 Drilling And Pump Company | 39 | 4 | 3 | 2024-06-24 |
| 233 | Lucerne Valley Pump Service | 26 | 4 | 1 | 2026-06-30 |
| 234 | Crum Sam Water Well Drilling Inc. | 591 | 3 | 7 | 2024-04-10 |
| 235 | Gulf Shore Construction Services Inc. | 28 | 3 | 6 | 2022-07-13 |
| 236 | Sixkiller Drilling | 26 | 3 | 2 | 2022-06-30 |
| 237 | Martin Pump & Supply Inc. | 2,524 | 2 | 9 | 2026-01-18 |
| 238 | Kirschenman's Well Drilling | 1,159 | 2 | 5 | 2029-02-20 |
| 239 | Wilkinson Enterprises Inc. | 445 | 2 | 8 | 2022-07-25 |
| 240 | Kruse Drilling Company | 373 | 2 | 3 | 2022-05-31 |
| 241 | Kenneth Roman | 320 | 2 | 5 | 2029-06-18 |
| 242 | Cache Creek Drilling | 247 | 2 | 17 | 2023-01-20 |
| 243 | Boart Longyear Company | 172 | 2 | 23 | 2022-03-26 |
| 244 | Hedman Drilling | 126 | 2 | 5 | 2022-08-31 |
| 245 | Louis P Bouscal | 97 | 2 | 1 | 2025-04-12 |
| 246 | Drilling Services Inc. | 63 | 2 | 9 | 2025-09-04 |
| 247 | Curtis Drilling Co. | 42 | 2 | 2 | 2024-10-14 |
| 248 | Gregg Drilling & Testing Inc. | 4,828 | 1 | 41 | 7012-02-07 |
| 249 | Beymer Well Service | 2,921 | 1 | 15 | 2029-08-25 |
| 250 | Bill Belknap | 2,758 | 1 | 21 | 2025-10-19 |
| 251 | Howard Pump Inc. A California Corporation | 1,650 | 1 | 11 | 2022-02-14 |
| 252 | Kelley Pump & Drilling | 1,515 | 1 | 2 | 2029-11-07 |
| 253 | American Technological Drilling Service Inc. | 1,385 | 1 | 5 | 2029-11-22 |
| 254 | Blake Hennings | 1,362 | 1 | 8 | 2025-04-16 |
| 255 | Bannon Walt Drilling Co. Inc. | 978 | 1 | 5 | 2024-08-27 |
| 256 | Chappell Pump & Supply Inc. | 927 | 1 | 7 | 2028-03-06 |
| 257 | Randall N Wallis | 531 | 1 | 9 | 2022-02-04 |
| 258 | Aguanga Waterwell Services Inc. | 504 | 1 | 2 | 3003-04-03 |
| 259 | Guardino Pump & Well | 482 | 1 | 10 | 2028-09-22 |
| 260 | Yosemite Falls Well Drilling | 464 | 1 | 8 | 2028-10-28 |
| 261 | Fundin Well Drilling | 394 | 1 | 3 | 2029-05-01 |
| 262 | Robert Allen Nix Well Drilling | 373 | 1 | 3 | 2022-09-01 |
| 263 | Baldwin & Son Well Drillers | 319 | 1 | 5 | 2027-08-10 |
| 264 | Valley Well & Pump Co. Inc. | 308 | 1 | 5 | 2028-12-16 |
| 265 | Tanko Gary C Well Drilling | 284 | 1 | 5 | 2029-06-26 |
| 266 | Moosios Pump Co. Inc. | 127 | 1 | 5 | 2026-12-24 |
| 267 | Clifford Pump & Well Company | 117 | 1 | 3 | 2027-03-26 |
| 268 | A A A Drilling Service | 99 | 1 | 6 | 2027-04-18 |
| 269 | Gopher Drilling | 79 | 1 | 6 | 2027-02-25 |
| 270 | Malcolm Drilling Company Inc. | 63 | 1 | 6 | 2024-06-11 |
| 271 | Kleinfelder Inc. | 54 | 1 | 11 | 2023-07-07 |
| 272 | Five Star Well Drilling Inc. | 45 | 1 | 5 | 2022-01-18 |
| 273 | Davis D A Company | 34 | 1 | 2 | 2026-08-10 |
| 274 | West Coast Exploration Inc. | 30 | 1 | 3 | 2022-07-12 |
| 275 | Bfr Associates | 5,621 | — | 22 | 2012-07-24 |
| 276 | Cascade Drilling Inc. - California | 3,167 | — | 36 | 2015-01-24 |
| 277 | Cascade Drilling L P | 2,827 | — | 43 | 2020-06-01 |
| 278 | Vaca Drilling Co. /Del Crew JR | 2,745 | — | 6 | 2007-11-28 |
| 279 | W D C Exploration & Wells | 2,421 | — | 42 | 2012-09-07 |
| 280 | Stroming Machinery | 2,391 | — | 5 | 2008-10-15 |
| 281 | Myers Reverse, Inc. | 2,389 | — | 18 | 2009-06-16 |
| 282 | Tezak Pump Co. Inc. | 2,380 | — | 5 | 2004-12-19 |
| 283 | Fronk's Mountain Drilling | 2,378 | — | 7 | 2009-01-29 |
| 284 | Aufdenkamp Drilling Inc. | 2,330 | — | 4 | 2017-07-10 |
| 285 | Hall Thomas A | 1,789 | — | 5 | 2015-11-18 |
| 286 | Floyd V Wells | 1,771 | — | 4 | 2006-09-26 |
| 287 | West Hazmat Drilling Corp | 1,702 | — | 29 | 2004-12-13 |
| 288 | Ivan D Alexander Water Well Drilling | 1,617 | — | 3 | 1990-10-18 |
| 289 | Woodward Drilling Company Inc. | 1,542 | — | 27 | 2019-11-05 |
| 290 | Rex Anderson Corp | 1,493 | — | 6 | 2007-06-30 |
| 291 | Acme Drilling Company | 1,439 | — | 10 | 2018-07-17 |
| 292 | Dunn Jack Inc. | 1,424 | — | 5 | 1985-04-09 |
| 293 | Robert Dawson Drilling & Pumps | 1,415 | — | 6 | 2007-11-09 |
| 294 | Nutting And Jensen Drilling | 1,410 | — | 5 | 2017-07-16 |
| 295 | MC Dougall's Well Drilling Inc. | 1,345 | — | 5 | 2000-06-14 |
| 296 | Rottman Drilling Co. | 1,331 | — | 16 | 2018-03-16 |
| 297 | D Hedman & Co. | 1,305 | — | 9 | 2009-09-17 |
| 298 | Bill Pulliam | 1,299 | — | 3 | 2019-11-08 |
| 299 | Allen Drilling Co. | 1,295 | — | 5 | 2007-09-28 |
| 300 | Beylik Drilling & Pump Service | 1,267 | — | 29 | 2012-03-12 |
| 301 | Aulman And Aulman Drilling Con | 1,251 | — | 5 | 1976-12-17 |
| 302 | H & B Drilling | 1,248 | — | 7 | 2017-06-29 |
| 303 | Pitcher Drilling Co. | 1,232 | — | 23 | 2019-02-11 |
| 304 | Moss Roscoe Company | 1,220 | — | 25 | 2019-10-16 |
| 305 | Hunt Drilling Company Inc. | 1,213 | — | 13 | 2018-09-05 |
| 306 | Arrow Well Drilling | 1,202 | — | 4 | 2014-11-12 |
| 307 | Redhawk Drilling | 1,197 | — | 4 | 1988-06-26 |
| 308 | Fox Gary & Co. | 1,185 | — | 4 | 2013-06-15 |
| 309 | Crislip Drilling Company | 1,174 | — | 5 | 1993-04-23 |
| 310 | Dejesus Pump & Well Drilling Inc. | 1,157 | — | 8 | 2014-06-21 |
| 311 | Doshier-Gregson Inc. | 1,156 | — | 6 | 2021-06-30 |
| 312 | Diamond Well Drilling Company Inc. | 1,150 | — | 8 | 2021-04-15 |
| 313 | Mariposa Well Drilling Company Inc. | 1,146 | — | 6 | 2019-12-21 |
| 314 | Jack Jones Wells & Pumps | 1,145 | — | 8 | 2016-12-16 |
| 315 | Anderson K Drilling, Inc. | 1,136 | — | 6 | 2017-10-20 |
| 316 | Wayne Drilling Co. | 1,113 | — | 13 | 1984-04-03 |
| 317 | Wilder, R., Drilling Company | 1,089 | — | 6 | 1994-07-18 |
| 318 | Beaman & Son Pump Co. | 990 | — | 3 | 1976-08-14 |
| 319 | D B Drilling Co. | 973 | — | 4 | 2007-07-04 |
| 320 | American Drilling | 970 | — | 8 | 1993-12-07 |
| 321 | Kile's Well Drilling | 943 | — | 16 | 2016-06-15 |
| 322 | Tri-K Drilling | 935 | — | 4 | 2000-12-05 |
| 323 | Aqua Drilling | 923 | — | 4 | 2009-10-02 |
| 324 | Panero Well Drilling Inc. | 921 | — | 5 | 1983-10-31 |
| 325 | Alexander Brothers | 903 | — | 3 | 2016-01-27 |
| 326 | Baldwin & Son Well Drilling | 901 | — | 8 | 2010-04-02 |
| 327 | Larbre Well Drilling And Pumps Inc. | 895 | — | 3 | 2017-09-25 |
| 328 | Herb Schwartz & Son Inc. | 875 | — | 3 | 2005-07-17 |
| 329 | Starr Drilling And Pump Co. | 875 | — | 20 | 1986-09-26 |
| 330 | Whitten Pumps Inc. | 874 | — | 11 | 2010-11-08 |
| 331 | Ballard & Foote | 870 | — | 5 | 1991-05-31 |
| 332 | Hammond Bros | 847 | — | 1 | 1978-07-24 |
| 333 | Western Well Drilling Co. Ltd | 842 | — | 28 | 2021-09-19 |
| 334 | A & A Gross Drilling | 816 | — | 9 | 2020-08-15 |
| 335 | Owens Drilling Co., Inc. | 805 | — | 3 | 2000-06-20 |
| 336 | Johnson Teddy J | 797 | — | 5 | 1972-04-19 |
| 337 | Myers Brothers Inc. | 796 | — | 20 | 1989-05-02 |
| 338 | Roger L. Nation | 796 | — | 4 | 1998-11-10 |
| 339 | H T Ted Herr | 776 | — | 4 | 2007-06-19 |
| 340 | Jim Mcclain Wells | 768 | — | 3 | 2006-12-29 |
| 341 | Mcguffie Well Drilling | 763 | — | 1 | 1992-09-29 |
| 342 | Schramm Drilling & Pump Co. | 762 | — | 2 | 1998-11-20 |
| 343 | R & B Drilling | 761 | — | 4 | 2006-11-08 |
| 344 | Woods Well Drilling | 755 | — | 5 | 1999-09-29 |
| 345 | Midway Drilling & Pump Company | 753 | — | 10 | 2006-01-30 |
| 346 | Diversified Exploration Co. Inc. | 751 | — | 11 | 1970-04-21 |
| 347 | Butler Drilling Company | 714 | — | 4 | 2011-07-27 |
| 348 | Salinas Pump Company | 712 | — | 8 | 2019-04-02 |
| 349 | Trudell Drilling Co. | 707 | — | 7 | 1998-07-11 |
| 350 | Landino Construction And Well Drilling | 703 | — | 5 | 1995-08-22 |
| 351 | C O Brose Well Drilling | 698 | — | 6 | 1987-09-17 |
| 352 | Preston Well Drilling | 698 | — | 6 | 1989-10-09 |
| 353 | C & N Pump & Well Co. | 697 | — | 15 | 1999-04-21 |
| 354 | Peter Garicia | 695 | — | 4 | 2007-09-27 |
| 355 | Freedom General Repair & Pump Shop | 690 | — | 7 | 1985-11-30 |
| 356 | D. W. Slooum | 688 | — | 5 | 1995-09-24 |
| 357 | C F Dougherty | 685 | — | 6 | 1971-02-26 |
| 358 | Levnard T Larson | 681 | — | 7 | 1979-09-21 |
| 359 | H O Krossa | 681 | — | 4 | 1969-04-10 |
| 360 | Water-Tech Well Drilling | 665 | — | 9 | 2010-07-12 |
| 361 | Wayne Environmental Drilling Company Inc. | 664 | — | 11 | 2002-12-13 |
| 362 | Coachella Valley Pump & Supply | 660 | — | 4 | 1994-10-21 |
| 363 | Weldon Francis M | 652 | — | 4 | 1980-07-19 |
| 364 | Vironex, Inc. | 649 | — | 12 | 2014-05-27 |
| 365 | Bootjack Drilling Inc. | 649 | — | 8 | 1997-11-11 |
| 366 | Simpson Drilling Company | 644 | — | 6 | 1987-03-29 |
| 367 | Aqua Engineering | 641 | — | 5 | 2019-11-22 |
| 368 | Osterberg And Stewart | 636 | — | 6 | 2008-11-01 |
| 369 | Wessel, Curtis | 628 | — | 2 | 1979-05-06 |
| 370 | Fisch Bros Pump Service | 620 | — | 5 | 1990-09-29 |
| 371 | H-F Drilling, Inc. | 618 | — | 10 | 2001-06-06 |
| 372 | Ron Engeldinger Well | 616 | — | 3 | 1999-11-08 |
| 373 | Independent Well Drilling Inc. | 615 | — | 3 | 2015-04-01 |
| 374 | Harich Enterprises Company Inc. | 612 | — | 4 | 2020-01-30 |
| 375 | All Well Abandonment | 607 | — | 20 | 2018-01-31 |
| 376 | Knapp & Graham Inc. | 596 | — | 6 | 1968-04-23 |
| 377 | Bartley Pump Inc. | 596 | — | 5 | 2004-05-17 |
| 378 | Norton Drilling | 596 | — | 6 | 2020-08-18 |
| 379 | Crown Drilling & Pump | 596 | — | 3 | 2014-04-04 |
| 380 | Underwood Well Drilling | 586 | — | 2 | 1997-03-08 |
| 381 | Frank Scully/Morrison Drilling Inc. | 582 | — | 6 | 2011-02-11 |
| 382 | Mccalla Brothers | 578 | — | 8 | 1988-05-11 |
| 383 | Osterberg And Carroll | 561 | — | 5 | 1965-01-27 |
| 384 | Wasco Drilling Company, Inc. | 554 | — | 10 | 2009-06-18 |
| 385 | Rock Well Drilling | 543 | — | 5 | 2003-11-03 |
| 386 | Manos Jim Drilling & Pump | 542 | — | 2 | 2015-05-20 |
| 387 | Water Well Supply | 533 | — | 5 | 2000-05-03 |
| 388 | Slate And Skaggs | 522 | — | 3 | 1969-10-14 |
| 389 | Boetsch Well Drilling And Pump Service | 522 | — | 6 | 2019-10-05 |
| 390 | Rauch Drilling Company Inc. | 520 | — | 9 | 1997-10-09 |
| 391 | Ken Gross Pump Service | 507 | — | 6 | 2019-07-07 |
| 392 | Sheela Drilling | 499 | — | 3 | 1984-02-11 |
| 393 | Anderson Brothers Water Well Drilling & Domestic Pumps | 492 | — | 3 | 2018-04-14 |
| 394 | Dicken's Drilling | 490 | — | 7 | 2016-12-21 |
| 395 | Doshier And Gregson Drilling Inc. | 489 | — | 6 | 1981-05-19 |
| 396 | Valley Pump & Drilling Co. | 475 | — | 10 | 1972-10-27 |
| 397 | S A Andresen All Terrain Exploration | 468 | — | 20 | 2002-04-08 |
| 398 | Beks Acquisition Inc. | 465 | — | 8 | 2019-03-26 |
| 399 | Sutter Pump Works | 449 | — | 4 | 1967-11-06 |
| 400 | Henry Kozera | 448 | — | 2 | 1998-07-07 |
| 401 | Burt Drilling Co. | 438 | — | 10 | 2014-11-08 |
| 402 | Batson Drilling Service | 436 | — | 4 | 2003-12-08 |
| 403 | Oscar L Nation | 431 | — | 3 | 1969-09-18 |
| 404 | John Linn Drilling, Co. | 428 | — | 6 | 1997-12-04 |
| 405 | Maranatha Drilling | 423 | — | 3 | 2010-03-17 |
| 406 | Brown Elvin | 422 | — | 5 | 1998-04-19 |
| 407 | Digges & Son | 421 | — | 3 | 1998-02-03 |
| 408 | Patten Well Drilling | 421 | — | 4 | 1989-04-16 |
| 409 | Tom Hunt Drilling Co. | 418 | — | 11 | 1994-08-01 |
| 410 | Harris A J Inc. A California Corporation | 416 | — | 4 | 1983-01-12 |
| 411 | Bob Beeman Drilling Company | 410 | — | 2 | 1995-02-02 |
| 412 | R Wilder Gen Cont | 409 | — | 5 | 1985-08-30 |
| 413 | Pambeau Pump & Well | 405 | — | 3 | 1995-03-31 |
| 414 | Raymond Alsop | 397 | — | 2 | 1987-06-11 |
| 415 | Resonantsonic International Inc. | 397 | — | 23 | 2011-11-08 |
| 416 | Herbert Schwartz | 389 | — | 3 | 2005-07-26 |
| 417 | Walter F Rettela | 389 | — | 3 | 1977-10-18 |
| 418 | Trunnell Wells & Pumps | 384 | — | 7 | 1983-10-03 |
| 419 | Lott Drilling Co. | 378 | — | 3 | 2019-07-15 |
| 420 | Testamerica Drilling Corp | 378 | — | 20 | 2011-04-14 |
| 421 | Weimer Stan Enterprises Inc. | 377 | — | 7 | 1980-06-17 |
| 422 | Herbert Schwartz & Son | 377 | — | 2 | 1973-12-20 |
| 423 | Williams Well Drilling | 376 | — | 12 | 1992-07-08 |
| 424 | Sears Well Drilling | 376 | — | 3 | 1988-07-22 |
| 425 | Pearson Pump And Drillling Company Inc. | 366 | — | 3 | 1994-08-18 |
| 426 | Tahoe Pump & Drilling Inc. | 358 | — | 6 | 1981-06-13 |
| 427 | Everett A Loewenstein | 357 | — | 4 | 2020-09-20 |
| 428 | Big Valley Water LLC | 356 | — | 5 | 2016-01-02 |
| 429 | Clearwater Drilling | 351 | — | 3 | 2004-06-16 |
| 430 | Raymond L Olson | 350 | — | 3 | 2002-05-03 |
| 431 | Roy V Alsop & Son Inc. | 349 | — | 2 | 1992-04-28 |
| 432 | Cruse Drilling Co. | 341 | — | 14 | 1997-09-07 |
| 433 | Belknap Pump Company Inc. | 340 | — | 4 | 2018-11-17 |
| 434 | James E Wright, JR | 328 | — | 4 | 1966-08-10 |
| 435 | Seanaco Inc. | 327 | — | 11 | 2005-11-09 |
| 436 | Mann Brothers | 326 | — | 5 | 1974-10-16 |
| 437 | Clovis Pump & Water Well | 323 | — | 8 | 1999-01-28 |
| 438 | Dane Pike Wells And Pump | 323 | — | 2 | 2002-10-08 |
| 439 | David And Son Drilling | 318 | — | 6 | 2018-12-07 |
| 440 | Bayland Drillers | 317 | — | 8 | 1998-11-09 |
| 441 | Cooper Drilling Co. | 315 | — | 3 | 2010-09-17 |
| 442 | Davis & Davis Well Drilling | 315 | — | 3 | 1989-03-24 |
| 443 | Harold Nutting | 313 | — | 3 | 1977-09-29 |
| 444 | M P Burgess | 313 | — | 4 | 1999-04-16 |
| 445 | Allen Drilling & Equipment Co. | 311 | — | 5 | 1982-08-11 |
| 446 | M A Bryant Drilling | 311 | — | 4 | 1993-05-21 |
| 447 | V & W Drilling | 310 | — | 20 | 2017-01-04 |
| 448 | Melvin Slate Water Well Drilling | 310 | — | 5 | 1969-06-09 |
| 449 | Olson's Plbg & Heating | 308 | — | 6 | 1998-10-30 |
| 450 | Spectrum Exploration Inc. | 307 | — | 23 | 2006-09-27 |
| 451 | American Well Drilling | 307 | — | 5 | 1998-03-25 |
| 452 | Filipponi & Thompson Drilling Company | 303 | — | 5 | 2000-08-09 |
| 453 | Bakersfield Pump Co. | 303 | — | 7 | 2000-07-13 |
| 454 | C. Cruse Drilling | 301 | — | 17 | 2003-03-14 |
| 455 | Ike's Pump & Drilling Inc. | 300 | — | 3 | 2017-09-01 |
| 456 | Anderson Pump Company | 299 | — | 4 | 2003-12-16 |
| 457 | R F Keyt | 299 | — | 5 | 1980-09-15 |
| 458 | Big Valley Drilling | 294 | — | 9 | 2019-06-20 |
| 459 | Kearns-Rivard Well Drilling | 291 | — | 5 | 1968-06-05 |
| 460 | West Coast Drilling | 288 | — | 6 | 2010-06-15 |
| 461 | Aquarius Drilling And Pump Co. | 288 | — | 4 | 1999-01-19 |
| 462 | Bill Rambeau Pump & Well Drilling | 288 | — | 5 | 2015-12-10 |
| 463 | B & J Drilling Company | 282 | — | 2 | 1977-02-25 |
| 464 | Desert Water Drilling Company | 279 | — | 5 | 1980-03-27 |
| 465 | Cullum Systems Incorporated | 277 | — | 9 | 1984-08-22 |
| 466 | P H Thurman | 277 | — | 2 | 2020-06-23 |
| 467 | Active Drilling & Pump Supply | 276 | — | 2 | 2020-07-01 |
| 468 | J Field Drilling Co. | 275 | — | 8 | 2010-03-08 |
| 469 | H A M Drilling Inc. | 273 | — | 9 | 1990-03-09 |
| 470 | Clark Well Inc. | 273 | — | 4 | 2001-04-28 |
| 471 | Belknap Scott M Well Drilling | 272 | — | 4 | 2016-04-20 |
| 472 | Multi Water Systems | 269 | — | 6 | 2001-04-14 |
| 473 | Fred H King | 267 | — | 3 | 1998-06-06 |
| 474 | Crwelldrilling | 266 | — | 2 | 2017-10-31 |
| 475 | Pacific Gas And Electric Company | 264 | — | 22 | 2018-03-27 |
| 476 | Water Well Drilling Cont | 263 | — | 6 | 1981-07-17 |
| 477 | Hudson R Barrow | 262 | — | 3 | 1983-09-22 |
| 478 | Melville L E & Sons Drilling Co. Inc. | 262 | — | 3 | 2018-08-24 |
| 479 | George Chamberlain | 256 | — | 4 | 1970-10-10 |
| 480 | Layne-Western Co. Inc. | 255 | — | 29 | 1991-11-06 |
| 481 | Owen Drilling Co. | 255 | — | 2 | 1978-05-23 |
| 482 | Mcgann Drilling | 254 | — | 5 | 1983-09-06 |
| 483 | American Well & Pump Service | 254 | — | 5 | 1979-05-16 |
| 484 | Flynn Well Drilling | 252 | — | 3 | 1975-11-26 |
| 485 | Faria Welldrilling | 250 | — | 2 | 2018-09-26 |
| 486 | Digges & Son Water Well Drilling | 250 | — | 3 | 1999-04-09 |
| 487 | Schrack Drilling Co. | 247 | — | 4 | 2021-09-17 |
| 488 | Heer Nar S | 245 | — | 12 | 2013-05-01 |
| 489 | Rockwell Drilling Co. | 244 | — | 8 | 1991-07-09 |
| 490 | Arrowhead Group | 244 | — | 6 | 2000-06-28 |
| 491 | Lennys Drilling | 243 | — | 1 | 2020-01-27 |
| 492 | Roman Well Drilling | 242 | — | 5 | 2001-11-20 |
| 493 | Harris A J Co. | 239 | — | 7 | 1979-10-02 |
| 494 | R D Norris & Son | 237 | — | 6 | 1956-06-21 |
| 495 | Wellmaster Drilling Company | 236 | — | 1 | 1991-03-23 |
| 496 | ED Fields Water Well Drilling | 234 | — | 12 | 2010-10-29 |
| 497 | Pulliam Well Exploration Inc. | 234 | — | 3 | 2019-10-22 |
| 498 | Precision Sampling Inc. | 234 | — | 13 | 2011-10-12 |
| 499 | 3-D Drilling Company | 233 | — | 5 | 2017-08-30 |
| 500 | Sage Bros Drilling Co. | 232 | — | 6 | 1983-06-03 |
| 501 | Mccalla Bros Pump And Drilling Co. | 229 | — | 5 | 1960-10-24 |
| 502 | V L Allen | 227 | — | 1 | 1997-02-10 |
| 503 | Tri-County Drilling Inc. | 227 | — | 6 | 2018-09-27 |
| 504 | Fox Loomis Incorporated | 225 | — | 8 | 2018-08-29 |
| 505 | Datum Exploration Inc. | 223 | — | 12 | 1991-07-15 |
| 506 | Island Drilling | 221 | — | 21 | 2019-08-02 |
| 507 | Frank P Conley | 218 | — | 5 | 1960-01-30 |
| 508 | Weeks Drilling Co. | 217 | — | 3 | 1957-07-31 |
| 509 | C. J Longwell | 217 | — | 2 | 1964-09-14 |
| 510 | D W Slocum Water Well Drilling | 217 | — | 7 | 1967-05-27 |
| 511 | Lynch L O Well Drilling And Supply | 213 | — | 3 | 1979-02-20 |
| 512 | Rottman Dick Water Well Drilling | 211 | — | 4 | 2014-12-12 |
| 513 | Fred W Porter & Son | 207 | — | 6 | 1983-07-28 |
| 514 | Rainbow Drilling | 207 | — | 7 | 2016-09-18 |
| 515 | Benny DI Prima | 205 | — | 2 | 1996-01-26 |
| 516 | Eagle Drilling | 205 | — | 1 | 1997-12-10 |
| 517 | Todd Ameteye | 205 | — | 1 | 1997-11-19 |
| 518 | Winter Abajian Well Drilling | 203 | — | 8 | 2003-07-22 |
| 519 | Leonard A Anderson Company | 203 | — | 2 | 1995-09-15 |
| 520 | Randazzo Drilling Services | 202 | — | 2 | 2003-04-10 |
| 521 | Tock-Bishop Well Drilling | 201 | — | 2 | 1981-07-14 |
| 522 | Strickland Drilling | 201 | — | 3 | 2008-11-07 |
| 523 | Turner Explorations Inc. | 200 | — | 5 | 1996-01-13 |
| 524 | Mitchell Drilling Environmental Corp | 199 | — | 13 | 2007-12-05 |
| 525 | Clifford Suffdy | 198 | — | 2 | 1970-04-04 |
| 526 | Motheral Well Drilling | 198 | — | 2 | 1996-04-05 |
| 527 | Forster Pump & Engineering Inc. | 197 | — | 3 | 2016-08-31 |
| 528 | Barstow Pump & Drilling | 197 | — | 1 | 1984-07-30 |
| 529 | Cranmer & Ellis Water Well Drillers | 197 | — | 5 | 1980-07-31 |
| 530 | D-R Water Well Drill | 196 | — | 3 | 1996-06-30 |
| 531 | Pioneer Pump And Well Co. | 195 | — | 8 | 2006-11-21 |
| 532 | Redfeairn R L Drilling | 195 | — | 14 | 2013-08-24 |
| 533 | Van Norman Well Drilling | 194 | — | 2 | 1998-03-05 |
| 534 | Robert Garcia Well & Pump Co. | 192 | — | 9 | 1996-09-17 |
| 535 | Clement D Clubb C-G Drilling | 192 | — | 2 | 1990-07-22 |
| 536 | Baker Lester A Wells & Pumps | 191 | — | 4 | 2008-05-01 |
| 537 | John L Panero JR | 188 | — | 2 | 1977-04-06 |
| 538 | Curtis Hole Drilling Company | 187 | — | 7 | 1992-11-25 |
| 539 | Harrison & Son's | 187 | — | 2 | 1982-06-28 |
| 540 | S/G Testing Laboratories Inc. | 187 | — | 9 | 2021-02-11 |
| 541 | Fisher & Sons Well Drilling Company | 187 | — | 1 | 1984-01-20 |
| 542 | Don Redfeairn Drilling Co. | 186 | — | 12 | 1997-12-06 |
| 543 | Jensen Drilling Company | 186 | — | 10 | 2020-03-17 |
| 544 | Kirkland Well Service | 184 | — | 4 | 1980-01-16 |
| 545 | Ritchey Bros | 183 | — | 5 | 2018-01-10 |
| 546 | Sayatovich J | 183 | — | 1 | 1981-09-22 |
| 547 | Western Well Drilling & Service | 181 | — | 2 | 1985-08-23 |
| 548 | Clark Albert M | 181 | — | 5 | 1996-01-11 |
| 549 | American River Well Drilling | 180 | — | 4 | 2001-03-30 |
| 550 | Dejesus Ernest Pump And Well Drilling Service | 178 | — | 2 | 2011-06-12 |
| 551 | Anderson & Seebeck | 178 | — | 4 | 1972-05-16 |
| 552 | Burnham & Plum Well Drilling Co. Inc. | 177 | — | 3 | 2001-04-27 |
| 553 | Vaca Drilling Co. | 176 | — | 3 | 1986-08-04 |
| 554 | Pearson Well Drilling | 176 | — | 5 | 1967-02-10 |
| 555 | Paul Williams And Sons | 175 | — | 7 | 2000-04-11 |
| 556 | White, Walter N. | 175 | — | 1 | 1992-10-17 |
| 557 | Beylik Drilling Inc. | 174 | — | 13 | 2002-05-01 |
| 558 | Roy Alsop Pump & Drilling | 173 | — | 3 | 2019-03-30 |
| 559 | Ralph E Anderson | 171 | — | 8 | 1975-07-29 |
| 560 | D W Moore Well Drilling | 170 | — | 3 | 1982-05-21 |
| 561 | Corrosion Technology Inc. | 169 | — | 9 | 1985-11-08 |
| 562 | Blain & Imbach Well Drilling | 168 | — | 4 | 1976-05-09 |
| 563 | Golden Empire Drilling | 168 | — | 12 | 1997-09-04 |
| 564 | Badger Drilling Company | 168 | — | 1 | 2000-10-19 |
| 565 | Doshier-Gregson Well Drilling Service | 167 | — | 4 | 1969-12-20 |
| 566 | Duval's Well Drilling | 167 | — | 2 | 1992-05-28 |
| 567 | F H Dengley | 167 | — | 2 | 1955-10-19 |
| 568 | Fain Drilling Company | 167 | — | 3 | 1977-01-10 |
| 569 | Points West Inc. | 165 | — | 4 | 1987-01-14 |
| 570 | Glenn Martell & Son Inc. | 164 | — | 3 | 1987-10-13 |
| 571 | Steve's Pumps & Well Drilling Inc. | 162 | — | 11 | 2021-05-13 |
| 572 | Kenneth J Mcavoy | 161 | — | 3 | 1984-03-04 |
| 573 | Warren Opie Wallis | 161 | — | 1 | 1981-02-13 |
| 574 | San Diego Pump & Well Drillers | 160 | — | 2 | 1979-11-06 |
| 575 | Gehrke-Bloomer | 160 | — | 4 | 1997-01-25 |
| 576 | SO Cal Pump And Well Drilling | 158 | — | 8 | 2010-09-14 |
| 577 | John H Correll | 158 | — | 2 | 1967-06-01 |
| 578 | HI-Desert Drillers | 158 | — | 2 | 2002-11-02 |
| 579 | Jim's Pump & Drilling | 157 | — | 5 | 1981-08-31 |
| 580 | DE Lucchi Well & Pump, Inc. | 157 | — | 5 | 1992-11-17 |
| 581 | E E Luhdorff | 155 | — | 9 | 1978-08-17 |
| 582 | Scott Xxx PC Exploration Inc. | 154 | — | 22 | 2009-11-03 |
| 583 | Bass Drilling | 154 | — | 6 | 2020-04-27 |
| 584 | Council Harold Drilling Co. | 154 | — | 4 | 1996-09-25 |
| 585 | Allmon C T Development Co. | 153 | — | 3 | 1992-04-01 |
| 586 | United Drilling | 152 | — | 2 | 1997-10-30 |
| 587 | Nation Well Drilling | 150 | — | 2 | — |
| 588 | San Joaquin Pump Co. | 150 | — | 1 | 1973-03-26 |
| 589 | R. S. DE Lucohi/ Delucchi Well & Pump | 149 | — | 3 | 2016-06-05 |
| 590 | Watson Well Drilling Inc. | 148 | — | 3 | 2018-12-20 |
| 591 | G Gakin Well Drilling | 147 | — | 5 | 1995-11-03 |
| 592 | Weston E Dawson | 147 | — | 4 | 1980-01-17 |
| 593 | V J Mcgrew | 147 | — | 7 | 1963-12-26 |
| 594 | Midwest Water Well Contracting Inc. | 147 | — | 2 | 2007-08-10 |
| 595 | Aulman & Aulman | 145 | — | 2 | 1973-07-18 |
| 596 | Alexander Dean Water Well Drilling | 145 | — | 3 | 2001-02-09 |
| 597 | Chapman Pump & Drilling Company | 145 | — | 2 | 1985-08-06 |
| 598 | Morrison Drilling | 145 | — | 1 | 2008-02-19 |
| 599 | Reeve Ralph Pump & Well Service | 145 | — | 2 | 2009-09-17 |
| 600 | John A Brandt | 143 | — | 5 | 1967-09-28 |
| 601 | S & S Water Well Drilling | 143 | — | 2 | 1999-09-15 |
| 602 | Castle Construction & Well Drilling Inc. | 142 | — | 22 | 2019-05-18 |
| 603 | Thomas E Mccaw Well Drilling | 141 | — | 2 | 2012-07-27 |
| 604 | Clifford Hudspeth | 140 | — | 1 | 1965-01-25 |
| 605 | County Well Drilling | 140 | — | 1 | 1986-12-20 |
| 606 | Taylor & Taber Drillers | 139 | — | 6 | 2003-07-15 |
| 607 | Larbre Well Driller | 138 | — | 2 | 1974-12-14 |
| 608 | Verne Guernsey | 137 | — | 2 | 1958-11-21 |
| 609 | Trc Solutions Inc. | 137 | — | 4 | 2008-08-21 |
| 610 | Kermit Heise | 136 | — | 1 | 1991-03-25 |
| 611 | Crisp & Sons Well Drilling | 136 | — | 4 | 2003-06-26 |
| 612 | Paiste Bobby Joe | 136 | — | 2 | 2018-04-20 |
| 613 | E Stewart Johnston For Valley Pump | 135 | — | 2 | 1981-06-22 |
| 614 | R R Kemp | 135 | — | 2 | 1966-03-19 |
| 615 | Allen's Drilling & Pump Service | 134 | — | 5 | 1986-10-21 |
| 616 | Soilprobe Inc. | 133 | — | 7 | 2018-12-14 |
| 617 | B & W Drilling | 132 | — | 8 | 1987-11-11 |
| 618 | Coastside Drilling & Pump Company | 131 | — | 3 | 1989-01-03 |
| 619 | Aqua Science Engineers Inc. | 131 | — | 7 | 1996-09-12 |
| 620 | Cowart Well Drilling | 131 | — | 4 | 2006-12-19 |
| 621 | Humboldt Drilling & Pump Co. | 131 | — | 17 | 2010-02-26 |
| 622 | Roscoe Moss Company | 130 | — | 17 | 2019-10-31 |
| 623 | Richardson Ernest Walker | 129 | — | 6 | 2000-08-10 |
| 624 | Rettela & Pulliam | 129 | — | 2 | 1979-02-24 |
| 625 | Capitola Pump & Supply Co. | 129 | — | 2 | 1974-03-06 |
| 626 | Longwell & Taylor | 129 | — | 2 | 1978-11-09 |
| 627 | Turner Drilling | 129 | — | 3 | 2005-09-26 |
| 628 | Tide Tool & Engr. Co. | 128 | — | 5 | 1977-01-10 |
| 629 | Thomas F Madsen | 128 | — | 4 | 1964-12-09 |
| 630 | Ephraim Harris | 127 | — | 2 | 1970-09-23 |
| 631 | Allison Sierra | 127 | — | 6 | 2020-08-03 |
| 632 | B & L Drilling Inc. | 126 | — | 1 | 1982-10-11 |
| 633 | Joseph F. Leisek | 126 | — | 8 | 2006-08-24 |
| 634 | M R Peck & Sons | 125 | — | 8 | 2006-06-07 |
| 635 | Allen, Ken II Drilling | 125 | — | 3 | 2007-08-22 |
| 636 | Thayer Well Drilling | 125 | — | 3 | 2015-08-03 |
| 637 | Modesto Well Drillers | 124 | — | 4 | 1969-03-11 |
| 638 | The Darrah Drilling Corp | 124 | — | 2 | 1980-10-25 |
| 639 | Nelson & Wilcox | 124 | — | 3 | 1969-10-21 |
| 640 | Jack Carrell Drilling Inc. | 123 | — | 5 | 1980-09-20 |
| 641 | Arthur F Loper | 123 | — | 4 | 1981-02-20 |
| 642 | Central Coast Drilling | 122 | — | 3 | 2005-08-23 |
| 643 | Star Well Drilling & Pump Co. | 122 | — | 5 | 1962-01-15 |
| 644 | Harich Construction | 122 | — | 3 | 2010-09-22 |
| 645 | Aquarius Well Drilling Inc. | 121 | — | 3 | 2019-10-25 |
| 646 | K F Guernsey | 119 | — | 4 | 1961-09-14 |
| 647 | Coastal Well Cleaning | 118 | — | 3 | 2003-01-26 |
| 648 | Aqua-Tek | 117 | — | 2 | 1992-03-20 |
| 649 | Stockton Armature & Motor Works | 116 | — | 1 | 1961-04-10 |
| 650 | Mclean & Williams Well Drilling | 116 | — | 2 | 1978-11-14 |
| 651 | Portola Pump & Drilling | 116 | — | 4 | 1996-08-29 |
| 652 | H C Steines | 115 | — | 3 | 1954-05-26 |
| 653 | L Van Winkle | 115 | — | 2 | 1958-07-01 |
| 654 | Dyna Drill International Inc. | 115 | — | 7 | 2010-03-14 |
| 655 | Gibson Well Drilling | 115 | — | 4 | 2016-10-30 |
| 656 | Ray Peterson Well Drilling | 114 | — | 1 | 1984-11-01 |
| 657 | Schroeder Cary Contracting Inc. | 114 | — | 1 | 2000-06-25 |
| 658 | Clarence Woodbury | 113 | — | 2 | 1992-04-08 |
| 659 | Dodson Contracting Co. | 113 | — | 6 | 1980-08-18 |
| 660 | Montalvo Well & Pump Co. | 113 | — | 4 | 1990-10-10 |
| 661 | Xxx | 113 | — | 20 | 2002-08-26 |
| 662 | Hunt Tom Drilling & Construction Co. | 112 | — | 5 | 1999-11-07 |
| 663 | Orsolini Well Drilling | 112 | — | 3 | 1980-04-19 |
| 664 | Carmel Valley Drilling & Engineering | 111 | — | 2 | 1986-05-01 |
| 665 | D L Rinker | 111 | — | 4 | 1961-12-27 |
| 666 | Coe Machine Works | 110 | — | 3 | 1957-02-26 |
| 667 | JC Drilling | 110 | — | 4 | 1992-11-12 |
| 668 | R Glick & Sons Water Wells | 109 | — | 2 | 1983-08-02 |
| 669 | Jeffrey David Harra | 109 | — | 8 | 2019-04-16 |
| 670 | C E Cates Well Drilling | 108 | — | 3 | 1993-04-09 |
| 671 | Evans Bros | 107 | — | 5 | 1970-07-11 |
| 672 | Tex Bassham Drilling | 107 | — | 4 | 1976-04-23 |
| 673 | Gilbert Drilling | 107 | — | 3 | 1991-12-24 |
| 674 | Howard Pump Company | 106 | — | 5 | 1995-02-07 |
| 675 | Fred W Porter & Sons | 105 | — | 5 | 2004-04-23 |
| 676 | Hugh M Harris Drilling Company | 105 | — | 4 | 1996-02-17 |
| 677 | Beale R B Inc. | 105 | — | 2 | 2005-09-06 |
| 678 | Agri-Cal Pump & Supply | 105 | — | 6 | 2003-05-06 |
| 679 | Haddon Drilling | 105 | — | 2 | 2013-11-12 |
| 680 | Layne Environmental Services Inc. | 104 | — | 9 | 1994-02-02 |
| 681 | Ira M Earp Well Drilling | 104 | — | 3 | 2017-05-13 |
| 682 | Jeffrey L Gross | 103 | — | 6 | 2010-06-03 |
| 683 | Bloomer E | 102 | — | 3 | 1978-12-18 |
| 684 | Brown Brothers Drilling | 102 | — | 4 | 2000-12-02 |
| 685 | Warden Drilling Co. | 102 | — | 3 | 1998-12-12 |
| 686 | V F Bassett | 101 | — | 7 | 1999-04-16 |
| 687 | Leroy Tyler | 100 | — | 3 | 1971-06-30 |
| 688 | Midway Drilling Xxx | 100 | — | 4 | 1958-04-01 |
| 689 | Environmental Investigation Services, Inc. | 100 | — | 4 | 2013-11-12 |
| 690 | Well Drilling | 100 | — | 5 | 2008-04-10 |
| 691 | Sierra Drilling Co. | 99 | — | 3 | 1970-08-14 |
| 692 | Conde A B | 99 | — | 1 | 1990-12-31 |
| 693 | W L Kirchgater | 98 | — | 4 | 1958-01-17 |
| 694 | O Hardcastle | 98 | — | 2 | 1963-09-15 |
| 695 | Hidden Valley Pump Systems Inc. | 98 | — | 2 | 2002-06-06 |
| 696 | David Engel | 98 | — | 2 | 1973-02-01 |
| 697 | Hydro Resources - West Inc. | 97 | — | 13 | 2015-10-19 |
| 698 | F P I Well Drilling Inc. | 96 | — | 6 | 2000-02-29 |
| 699 | Kimzey- Lee Well & Pump Co. | 95 | — | 2 | 1997-12-02 |
| 700 | Dail Rhoads Well Drilling | 95 | — | 3 | 1991-08-04 |
| 701 | Nelson Well Drilling | 94 | — | 2 | 1985-11-02 |
| 702 | Old Creek Drilling | 94 | — | 6 | 1994-06-17 |
| 703 | L. Wade Inc. | 93 | — | 9 | 2006-06-30 |
| 704 | Melvin L Lukins | 93 | — | 3 | 1977-08-30 |
| 705 | Howard H. Ley | 92 | — | 1 | 1969-09-13 |
| 706 | Southern Sierra Drilling | 92 | — | 5 | 2013-09-28 |
| 707 | Council Harold Drilling & Pump Service | 91 | — | 3 | 2000-03-25 |
| 708 | Cornerstone Pump & Well Inc. | 90 | — | 11 | 2009-10-27 |
| 709 | Modoc Drilling | 90 | — | 6 | 1998-12-02 |
| 710 | Rasmussen Well & Pump | 88 | — | 3 | 1972-12-15 |
| 711 | A & S Pump Service | 88 | — | 3 | 2016-10-10 |
| 712 | R H Forney | 88 | — | 4 | 1972-12-24 |
| 713 | Barbour Corporation | 88 | — | 4 | 2009-04-14 |
| 714 | Brand & Water Wells | 88 | — | 2 | 1993-09-23 |
| 715 | F Lahorgue | 87 | — | 3 | 1974-10-22 |
| 716 | Gateway Drilling | 87 | — | 2 | 1994-08-30 |
| 717 | Tri State Water Well Drilling & Pumps Inc. | 87 | — | 3 | 2018-07-06 |
| 718 | James P Treadway | 87 | — | 2 | 1952-05-29 |
| 719 | Barnes Core Drlg | 86 | — | 8 | 1981-05-29 |
| 720 | R P Seay | 86 | — | 3 | 2001-08-28 |
| 721 | B R Purviance | 86 | — | 5 | 1957-09-08 |
| 722 | A R S Fracturing And Drilling Service | 86 | — | 3 | 2016-02-18 |
| 723 | James W Imbach Well Drilling | 86 | — | 4 | 1968-03-28 |
| 724 | Pacific Geoscience Inc. | 84 | — | 6 | 2010-05-17 |
| 725 | Pipeline Industries-Drill Line Division | 84 | — | 3 | 1991-05-10 |
| 726 | D & S Well Drilling | 84 | — | 4 | 1996-11-23 |
| 727 | Fortune Drilling | 84 | — | 3 | 2018-06-01 |
| 728 | Olson Well Drilling | 84 | — | 3 | 2009-03-18 |
| 729 | Beeman Well Drilling | 84 | — | 2 | 1994-02-02 |
| 730 | Stump Drilling Corp | 84 | — | 3 | 1991-07-24 |
| 731 | Clark F Wells Corp | 83 | — | 4 | 1956-04-23 |
| 732 | Viking Drillers Inc. | 83 | — | 6 | 2009-09-28 |
| 733 | Koenig Enterprises | 83 | — | 7 | 2018-02-16 |
| 734 | Ase Drilling Inc. | 82 | — | 14 | 2013-08-09 |
| 735 | W E Blain | 82 | — | 7 | 1974-09-03 |
| 736 | Gary Fox & Co. | 82 | — | 3 | 2000-06-25 |
| 737 | L. E. Melville & Son, Inc. | 80 | — | 3 | 1997-09-12 |
| 738 | Murrieta Water Well Drilling Company | 80 | — | 3 | 1981-08-11 |
| 739 | Carrell & Canepa Drilling | 79 | — | 5 | 1979-01-07 |
| 740 | Shoup Burton C Well Drilling And Pumps | 79 | — | 3 | 1997-09-11 |
| 741 | Valley Pump & Dairy Systems Inc. | 79 | — | 4 | 1996-01-10 |
| 742 | Ray Parnell Drilling Contractor | 79 | — | 3 | 1990-09-20 |
| 743 | Oberto's Plumbing & Well Drilling | 78 | — | 3 | 1956-11-07 |
| 744 | Sydney Geels IT Corporation | 78 | — | 6 | 2006-05-08 |
| 745 | Boggs Drilling | 78 | — | 2 | 2007-11-12 |
| 746 | Points West Drilling | 78 | — | 12 | 2019-10-07 |
| 747 | Williams Bros Well Drilling | 77 | — | 2 | 1983-06-07 |
| 748 | Santa Rosa Drilling Co. | 77 | — | 5 | 1973-10-15 |
| 749 | Clovis Well Drilling | 77 | — | 5 | 2014-08-06 |
| 750 | Garcia Well Drilling | 77 | — | 1 | 1984-07-20 |
| 751 | Chino Valley Water Well Supply Inc. | 77 | — | 3 | 1968-03-07 |
| 752 | Hurd, Clarence | 77 | — | 3 | 2000-08-03 |
| 753 | Criswell Drilling Co. | 77 | — | 2 | 1979-04-09 |
| 754 | Westside Drilling & Development Co. | 77 | — | 4 | 1966-10-03 |
| 755 | L & L Well Drilling | 76 | — | 3 | 1995-07-31 |
| 756 | Clark & Sons | 76 | — | 3 | 1984-08-04 |
| 757 | Enprobe Environental Direct Push & Drilling Services | 76 | — | 9 | 2013-11-08 |
| 758 | Myers And Summers | 75 | — | 7 | 1993-10-25 |
| 759 | Morris And Nelson | 75 | — | 2 | 1960-07-12 |
| 760 | Orin F Gaskin & Edward F Swiecki Drilling | 75 | — | 2 | 1980-03-04 |
| 761 | M S Seebeck & Son | 75 | — | 8 | 1993-07-19 |
| 762 | Interstate Soils Sampling Inc. | 75 | — | 6 | 1996-01-13 |
| 763 | C C Scott | 75 | — | 6 | 1974-07-01 |
| 764 | Meridian Drilling & Well Supply | 74 | — | 3 | 1975-12-08 |
| 765 | Julian Pump | 74 | — | 2 | 1982-02-27 |
| 766 | M & M Well Drilling | 74 | — | 13 | 2018-09-18 |
| 767 | Landino Well Drilling | 73 | — | 3 | 2019-08-23 |
| 768 | Canada Pump Sales & Service Inc. | 73 | — | 3 | 1979-10-12 |
| 769 | Miles Mark Well Drilling | 73 | — | 1 | 2019-12-10 |
| 770 | Nuner Well Drilling | 73 | — | 2 | 1979-07-25 |
| 771 | Joe Souza | 72 | — | 4 | 1971-11-23 |
| 772 | Graves & Graves Drilling | 72 | — | 3 | 1971-05-28 |
| 773 | Klein Knight Drlg Co. | 72 | — | 5 | 1967-12-11 |
| 774 | Precision Drilling Co. | 71 | — | 12 | 2011-08-23 |
| 775 | Fisher Well Drilling Company | 70 | — | 1 | 1982-12-03 |
| 776 | Big Dog Drilling Inc. | 70 | — | 4 | 2019-06-25 |
| 777 | Bushnell Enterprises | 70 | — | 3 | 2020-07-24 |
| 778 | Chester A. Hollister | 70 | — | 1 | 1955-02-21 |
| 779 | A C Waller | 69 | — | 2 | 1957-09-11 |
| 780 | T. Carmack | 69 | — | 2 | 1957-09-16 |
| 781 | D C A Drilling And Construction Inc. | 69 | — | 4 | 2020-01-14 |
| 782 | Southern Deep Well Drilling Co. | 69 | — | 2 | 1986-06-25 |
| 783 | Robertson Bros | 68 | — | 8 | 1979-04-03 |
| 784 | J. T. Robinett & Sons | 67 | — | 3 | 2007-10-20 |
| 785 | Radulovich Well Drilling | 67 | — | 3 | 1989-03-04 |
| 786 | Mcdougall's Well Drilling | 67 | — | 1 | 2000-02-23 |
| 787 | Trinity Source Group Inc. | 67 | — | 7 | 2020-12-30 |
| 788 | Tom Seay | 67 | — | 2 | 1956-10-17 |
| 789 | Scoggin Drilling Company | 67 | — | 2 | 1978-09-01 |
| 790 | Valley Home Drilling Co. | 67 | — | 4 | 1979-10-09 |
| 791 | William L Myers | 66 | — | 3 | 1982-02-09 |
| 792 | Sprague Pump Co. | 66 | — | 3 | 1994-05-09 |
| 793 | Graham & Son Drilling Co. | 66 | — | 4 | 1983-04-15 |
| 794 | Goehring Well Drilling | 66 | — | 3 | 1972-07-07 |
| 795 | General Development | 65 | — | 3 | 1981-11-05 |
| 796 | Barber-Bridge Drilling Corp Ltd | 64 | — | 6 | 1958-08-06 |
| 797 | Atec Drilling Co. | 63 | — | 4 | 2006-11-02 |
| 798 | Clark Well Drilling Co. | 63 | — | 2 | 1974-07-26 |
| 799 | Peerless Welding & Machine Shop | 63 | — | 4 | 1977-05-30 |
| 800 | Mazzetti & Company | 63 | — | 2 | 1990-11-15 |
| 801 | Allen's Drilling | 63 | — | 4 | 2017-01-30 |
| 802 | Virgil H Chase | 63 | — | 1 | 1964-09-12 |
| 803 | Agri-Mall Irrigation | 63 | — | 2 | 1977-12-21 |
| 804 | Harvey Gehrke | 63 | — | 3 | 1983-06-30 |
| 805 | A And V Pumps | 62 | — | 1 | 1977-10-21 |
| 806 | Matthew A. Bass | 62 | — | 4 | 2017-09-12 |
| 807 | Reliance Drilling Co. | 62 | — | 2 | 1959-10-01 |
| 808 | Maxwell Drilling | 61 | — | 3 | 1995-10-12 |
| 809 | L R Hood | 61 | — | 2 | 1984-11-21 |
| 810 | Pioneer Drilling Inc. | 61 | — | 6 | 1989-08-22 |
| 811 | Dan MC Mullen Well Drilling | 61 | — | 4 | 2015-11-16 |
| 812 | Robertson Drilling Co. | 61 | — | 3 | 1984-03-04 |
| 813 | A & R Drilling | 60 | — | 8 | 2003-02-26 |
| 814 | Lang Pump & Well Company | 60 | — | 4 | 2009-11-10 |
| 815 | Dell D Beck | 60 | — | 3 | 1956-11-30 |
| 816 | D P Well Drilling | 60 | — | 4 | 1985-05-24 |
| 817 | Santa Ynez Pump & Drilling | 60 | — | 1 | 2007-08-29 |
| 818 | ED Severin | 60 | — | 2 | 1971-04-27 |
| 819 | Valley Water Well Drilling And Pump Co. | 59 | — | 3 | 1972-04-10 |
| 820 | Pierson Drilling | 59 | — | 5 | 1981-06-27 |
| 821 | Geo W Taylor Well Drlg Service | 58 | — | 4 | 1956-02-09 |
| 822 | A J Kessel | 58 | — | 1 | 1969-05-07 |
| 823 | Wahl & Wood Drilling | 58 | — | 2 | 1988-10-23 |
| 824 | Terry Well Drilling | 58 | — | 4 | 1972-12-18 |
| 825 | E & S Water Well Drilling | 58 | — | 2 | 1979-01-30 |
| 826 | Floyd's Well Drilling | 58 | — | 5 | 1981-01-23 |
| 827 | Waldrop Drilling & Pump Co. Inc. | 57 | — | 2 | 1988-01-16 |
| 828 | Patrick O Fortney | 57 | — | 3 | 1966-05-06 |
| 829 | Mogle Brothers | 57 | — | 6 | 1957-01-08 |
| 830 | Everett E. Mcbride Dba | 57 | — | 4 | 1984-08-17 |
| 831 | A & B Water Well Drilling | 57 | — | 1 | 1991-02-09 |
| 832 | Hylton Drilling Co. | 57 | — | 4 | 1977-06-03 |
| 833 | Murray Well Drilling | 56 | — | 1 | 1979-11-30 |
| 834 | Stang Hydronics Inc. | 56 | — | 15 | 1984-08-01 |
| 835 | Carver Pump & Drilling Inc. | 56 | — | 3 | 1986-10-15 |
| 836 | Mason Drilling | 56 | — | 1 | 1995-06-23 |
| 837 | Robie Drilling Company | 56 | — | 1 | 1976-04-26 |
| 838 | H & L Drilling Company | 56 | — | 1 | 1979-04-15 |
| 839 | Cates Lloyd Drilling | 56 | — | 2 | 1996-04-05 |
| 840 | Ost-Air Drilling | 56 | — | 2 | 1983-07-15 |
| 841 | Nero Ostenberg | 55 | — | 3 | 1961-08-19 |
| 842 | Case Pacific Company | 55 | — | 2 | 2008-09-09 |
| 843 | Bill Julian Pump | 55 | — | 2 | 1983-01-13 |
| 844 | R Barrick For Great Sierra | 55 | — | 6 | 2011-08-25 |
| 845 | Charles Nyberg Well Drilling | 55 | — | 3 | 2005-05-10 |
| 846 | Rural Drilling Co. | 55 | — | 3 | 2020-04-01 |
| 847 | C W Drilling | 55 | — | 2 | 1991-04-10 |
| 848 | Jack J Dunn | 54 | — | 3 | 1958-01-21 |
| 849 | Shipps For Water Well | 54 | — | 3 | 1976-09-28 |
| 850 | Errin A Smith Drilling | 54 | — | 3 | 1997-10-25 |
| 851 | Roche Well And Pump Company | 54 | — | 4 | 2016-05-24 |
| 852 | Martin & Son Water Well Drilling | 54 | — | 1 | 1979-07-27 |
| 853 | Delbert Wolfe | 54 | — | 1 | 1957-04-25 |
| 854 | Dexter Machinery | 53 | — | 6 | 1978-08-11 |
| 855 | Silva Bros | 53 | — | 1 | 1963-07-02 |
| 856 | Bailey Drilling & Pump Inc. | 53 | — | 3 | 2009-07-08 |
| 857 | Mogle Drilling & Pump Company | 53 | — | 3 | 1960-04-22 |
| 858 | Moffitt & Wells | 53 | — | 2 | 1963-12-02 |
| 859 | Peterson Drilling & Pump | 53 | — | 1 | 2002-12-30 |
| 860 | Anderson G C Drilling & Pump | 53 | — | 8 | 2015-08-27 |
| 861 | Jvl Water Well Drilling | 52 | — | 3 | 2003-01-30 |
| 862 | Leite Pump Sales | 52 | — | 1 | 1978-09-14 |
| 863 | Welltest Inc. | 52 | — | 5 | 2014-04-21 |
| 864 | J C Water Well Drilling | 52 | — | 5 | 2010-01-10 |
| 865 | Pipe Dreams Inc. | 52 | — | 2 | 1979-12-20 |
| 866 | Day, Sloan | 52 | — | 1 | 1987-09-23 |
| 867 | George Chambers | 51 | — | 2 | 1976-03-28 |
| 868 | Capitola Pump Inc. | 51 | — | 2 | 1988-11-04 |
| 869 | Vaughn Maynard & Sons | 51 | — | 2 | 1961-05-05 |
| 870 | Paul Neville | 51 | — | 4 | 1962-08-10 |
| 871 | Melvin A Mcfadden | 51 | — | 5 | 1970-08-08 |
| 872 | Hacker's Pump Service | 51 | — | 5 | 1988-05-19 |
| 873 | Mcrae K M Inc. | 51 | — | 2 | 2007-06-08 |
| 874 | Great Basin Drilling | 51 | — | 2 | 2018-03-14 |
| 875 | Gene Dyke | 51 | — | 2 | 1985-04-22 |
| 876 | Jack C Guernsey | 51 | — | 2 | 1967-02-17 |
| 877 | Desert Oasis Drilling | 50 | — | 1 | 1989-08-30 |
| 878 | Bert Belknap | 50 | — | 3 | 1953-01-29 |
| 879 | Kennedy, Bryant, Drilling Co. | 50 | — | 2 | 1984-02-29 |
| 880 | Ben Barrow Company | 49 | — | 8 | 1973-04-26 |
| 881 | Harvey Shoup | 49 | — | 1 | 1973-12-10 |
| 882 | Campbell Drilling | 49 | — | 1 | 2003-10-03 |
| 883 | Hall Construction Company | 49 | — | 2 | 1990-06-10 |
| 884 | Janco Pump & Equipment Co. | 49 | — | 1 | 1982-07-29 |
| 885 | Van Loon Jack | 49 | — | 3 | 2018-01-26 |
| 886 | Xxx Soils Exploration SV | 48 | — | 13 | 1997-02-01 |
| 887 | ED Owens & Son Drilling Co. | 48 | — | 5 | 1968-12-11 |
| 888 | CR Well Drilling | 48 | — | 2 | 2010-06-02 |
| 889 | Teredon Company | 48 | — | 4 | 1976-03-08 |
| 890 | Murphys Well Drilling | 48 | — | 1 | 1989-05-03 |
| 891 | Robert Haylock "RH" Well Drilling | 48 | — | 4 | 2017-03-20 |
| 892 | Steven E Foster | 48 | — | 2 | 2018-03-30 |
| 893 | Howk Well & Equipment Co. | 48 | — | 5 | 1977-06-15 |
| 894 | Joe W Baker | 48 | — | 3 | 1968-07-21 |
| 895 | J Lippi & Son | 47 | — | 3 | 1956-08-28 |
| 896 | H W Bence | 47 | — | 4 | 1968-08-20 |
| 897 | E Larsen | 47 | — | 3 | 1978-07-26 |
| 898 | Moerlien's Plumbing & Electric Shop | 47 | — | 2 | 1993-10-06 |
| 899 | A J Oberto | 47 | — | 3 | 1954-03-05 |
| 900 | Claude E Kelley | 47 | — | 2 | 1955-02-11 |
| 901 | Santa Ynez Valley Well Service | 47 | — | 2 | 1988-05-21 |
| 902 | J. R. Greenlee | 47 | — | 1 | 1967-10-19 |
| 903 | Robert Garcia Well Drilling & Pump Co. | 46 | — | 2 | 1963-07-31 |
| 904 | William Porter Well Drilling | 46 | — | 3 | 1977-09-15 |
| 905 | Groundwater Technology | 46 | — | 9 | 1994-04-13 |
| 906 | Nunes Well Service | 46 | — | 2 | 1966-10-08 |
| 907 | Roy V Alsop | 46 | — | 2 | 1995-10-18 |
| 908 | Hiram G Smith | 46 | — | 2 | 1958-02-20 |
| 909 | Patrick O Fortney & Son | 46 | — | 2 | 1966-06-07 |
| 910 | Rea Construction | 46 | — | 5 | 1989-04-11 |
| 911 | Trihydro Corporation | 46 | — | 6 | 2010-01-16 |
| 912 | Moore Twining Associates Inc. | 46 | — | 7 | 2019-10-03 |
| 913 | Joey's Well Drilling & Construction | 46 | — | 3 | 2017-07-05 |
| 914 | Dales Drilling | 46 | — | 2 | 1989-02-10 |
| 915 | Melton Drilling Co. | 46 | — | 5 | 2000-06-03 |
| 916 | Lawand Drilling | 46 | — | 2 | 1985-04-12 |
| 917 | Acton Well Drilling | 45 | — | 2 | 1963-05-28 |
| 918 | Reuben J Boe Water Well Drilling | 45 | — | 2 | 1969-04-15 |
| 919 | H Allen Herr Domestic Well Drilling | 45 | — | 3 | 1998-08-05 |
| 920 | Herzog & Associates | 45 | — | 1 | 2007-04-15 |
| 921 | Alva E Morgan | 45 | — | 4 | 2004-09-30 |
| 922 | L M Quinn | 44 | — | 2 | 1958-06-15 |
| 923 | Baliel Drilling | 44 | — | 1 | 1983-01-02 |
| 924 | J W Evans & Sons | 44 | — | 3 | 2000-07-06 |
| 925 | Saunders Brothers | 44 | — | 4 | 1970-12-09 |
| 926 | Modern Technology Resources Inc. | 44 | — | 12 | 2018-09-11 |
| 927 | George Stamp | 44 | — | 2 | 1960-10-11 |
| 928 | S I Guardino | 43 | — | 9 | 1954-06-23 |
| 929 | Stockton Pump & Machine Co. | 43 | — | 1 | 1986-10-31 |
| 930 | Bishop Electric | 43 | — | 2 | 1989-05-04 |
| 931 | Universal Pump & Supply Inc. | 43 | — | 2 | 1992-02-10 |
| 932 | Ronald L Clark Clark Water Svc | 43 | — | 3 | 1993-05-30 |
| 933 | Premier Drilling Company | 43 | — | 3 | 2021-08-07 |
| 934 | Cobb Well Drilling | 43 | — | 1 | 1981-07-06 |
| 935 | Zeno Strout | 42 | — | 1 | 1967-11-10 |
| 936 | Kelley Mike | 42 | — | 1 | 1977-11-25 |
| 937 | Gullord Arthur Water Well Drilling | 42 | — | 2 | 1992-04-10 |
| 938 | Applied Hydrogeologic Consultants Inc. | 42 | — | 1 | 1992-09-02 |
| 939 | K & D Drilling | 42 | — | 2 | 1983-01-26 |
| 940 | Western Rentals & Sales | 41 | — | 1 | 1969-05-17 |
| 941 | Hoffman J F Well Driller | 41 | — | 3 | 1978-06-23 |
| 942 | C & M Drilling Co. | 41 | — | 6 | 2003-11-14 |
| 943 | Abajian Seth Well Drilling | 41 | — | 5 | 1994-07-28 |
| 944 | Arthur's Well Drilling | 41 | — | 7 | 1976-05-15 |
| 945 | John Panero And Carl Mcleister | 41 | — | 2 | 1965-11-03 |
| 946 | Cullum Drilling & Pump Service | 40 | — | 2 | 1972-10-13 |
| 947 | George Putman | 40 | — | 2 | 1958-11-25 |
| 948 | Suffdy Earl Ramey | 40 | — | 1 | 1960-06-11 |
| 949 | Westex | 40 | — | 6 | 2005-12-04 |
| 950 | All American Water Supply OF California Inc. | 40 | — | 10 | 2012-08-20 |
| 951 | N A F F C O Pump And Well Inc. | 40 | — | 4 | 2020-01-08 |
| 952 | Beckett Drilling & Pump Service | 40 | — | 2 | 2018-02-05 |
| 953 | Gamoian & Reyes Enterprises Dba A & M Well Drilling | 40 | — | 1 | 1978-05-16 |
| 954 | Atwater Well Drilling | 40 | — | 5 | 2021-04-06 |
| 955 | Machado Inc. | 40 | — | 2 | 1980-02-08 |
| 956 | Andy Noblin | 39 | — | 4 | 1967-05-21 |
| 957 | John W. Nairn | 39 | — | 3 | 1979-03-01 |
| 958 | Pollock's Drilling & Pump Service | 39 | — | 6 | 1999-06-15 |
| 959 | C D Thompson | 39 | — | 1 | 1956-09-21 |
| 960 | Furlong Well Drilling | 39 | — | 1 | 1982-06-17 |
| 961 | Cal Drilling | 39 | — | 1 | 2016-10-20 |
| 962 | Dudley Newton JR | 38 | — | 4 | 2007-09-21 |
| 963 | Hew Drilling Co. | 38 | — | 3 | 2010-09-03 |
| 964 | Lovejoy Sherwood JR | 38 | — | 3 | 2011-02-12 |
| 965 | Louis A Wood Co. | 38 | — | 3 | 2009-06-25 |
| 966 | FA Moves | 38 | — | 1 | 1956-08-11 |
| 967 | Environmental West Drilling | 38 | — | 7 | 2008-10-21 |
| 968 | Deer Creek Drilling Inc. | 38 | — | 3 | 2019-04-04 |
| 969 | Tom's Well Drilling And Company | 38 | — | 1 | 2016-11-30 |
| 970 | James And Wilkerson Drilling | 37 | — | 3 | 1974-07-17 |
| 971 | William B Zuver | 37 | — | 2 | 1998-03-23 |
| 972 | California Well Drilling & Pump Co. | 37 | — | 3 | 1978-02-28 |
| 973 | Mclean & Williams Inc. | 37 | — | 1 | 2015-12-09 |
| 974 | Keener Exploration Drilling Co. | 37 | — | 7 | 1973-03-25 |
| 975 | Errol A Smith Drilling | 37 | — | 4 | 1990-03-30 |
| 976 | Collum Drilling Company | 37 | — | 6 | 1965-03-27 |
| 977 | Alberts Pump & Well Service | 37 | — | 1 | 1982-08-16 |
| 978 | Aqua Drilling & Well Service Inc. | 37 | — | 7 | 2002-04-03 |
| 979 | R E S N A | 37 | — | 4 | 2007-11-14 |
| 980 | Dan's Water Well & Pump Service Inc. | 37 | — | 6 | 2017-08-28 |
| 981 | Carmack & Stephenson | 37 | — | 2 | 1951-12-13 |
| 982 | Harry Ross | 37 | — | 2 | 1978-10-06 |
| 983 | Bsk Associates | 37 | — | 8 | 2000-04-19 |
| 984 | Arthur T Ball | 37 | — | 3 | 1958-07-22 |
| 985 | Great Western Company | 37 | — | 1 | 1978-06-19 |
| 986 | Delap & Sons | 37 | — | 2 | 1996-06-03 |
| 987 | Davis Machine Shop Inc. | 37 | — | 5 | 2020-03-03 |
| 988 | L Larson | 36 | — | 4 | 1969-04-18 |
| 989 | Valley Pump & Supply | 36 | — | 1 | 1957-10-14 |
| 990 | Peaker Paul | 36 | — | 3 | 1978-11-10 |
| 991 | Fugro Usa Land Inc. | 36 | — | 4 | 2018-05-23 |
| 992 | Arrowhead Water Well Drilling | 36 | — | 2 | 1992-08-03 |
| 993 | Geo S Bandy | 36 | — | 2 | 1964-10-04 |
| 994 | Jdk Drilling Inc. | 36 | — | 1 | 2013-07-12 |
| 995 | Walter G Noack & Son Inc. | 35 | — | 1 | 1976-04-14 |
| 996 | Roy S Devoe | 35 | — | 1 | 1972-10-13 |
| 997 | B & F Drilling | 35 | — | 10 | 1996-03-27 |
| 998 | William A Duer | 35 | — | 1 | 1974-06-06 |
| 999 | L E Tomson | 35 | — | 3 | 1954-06-26 |
| 1000 | M & W Pumps Inc. | 35 | — | 3 | 2011-06-01 |
| 1001 | E H Bradfield & Son | 35 | — | 1 | 1950-12-20 |
| 1002 | Levy Matthews & Son | 35 | — | 5 | 2007-04-29 |
| 1003 | T C B Well Drilling Co. | 35 | — | 2 | 1993-08-07 |
| 1004 | Ralph A Johnson | 35 | — | 1 | 1967-09-10 |
| 1005 | Gerald Foster | 34 | — | 2 | 1952-05-09 |
| 1006 | Hutton Drilling | 34 | — | 3 | 2015-10-21 |
| 1007 | Larry Herman Drilling | 34 | — | 4 | 2012-01-16 |
| 1008 | Solomon Excavation Inc. | 34 | — | 1 | 2010-08-15 |
| 1009 | Mcgann | 34 | — | 5 | 1990-10-26 |
| 1010 | The Pump Shop Inc. | 33 | — | 2 | 1971-04-14 |
| 1011 | Thomas L Manos | 33 | — | 1 | 1976-01-30 |
| 1012 | Kenn Alexanderson | 33 | — | 1 | 1991-10-15 |
| 1013 | H2o Producers | 33 | — | 2 | 1992-04-21 |
| 1014 | Widner Arthur Grover | 33 | — | 1 | 2001-12-10 |
| 1015 | Shipps For Water Well Drilling | 33 | — | 6 | 2021-04-12 |
| 1016 | Water Well Drilling Ernest E Bartell | 33 | — | 2 | 1974-01-30 |
| 1017 | Baker Scott | 33 | — | 5 | 2010-09-03 |
| 1018 | A A A Pump And Well Drilling | 33 | — | 1 | 2005-05-11 |
| 1019 | Tcb Well Drilling | 32 | — | 3 | 1991-10-09 |
| 1020 | John H. And Jack A. Correll | 32 | — | 3 | 1958-12-21 |
| 1021 | Cofferdam Unwatering Corporation | 32 | — | 13 | 1985-03-14 |
| 1022 | H A Moore Drlng | 32 | — | 4 | 1978-12-08 |
| 1023 | Geoloop Drilling/Tom Moreland | 32 | — | 8 | 2014-04-23 |
| 1024 | Pacific West Services | 32 | — | 1 | 2019-08-23 |
| 1025 | Well Tech | 32 | — | 5 | 1989-02-05 |
| 1026 | E R Young | 32 | — | 1 | 1953-07-18 |
| 1027 | Hail Drlg | 32 | — | 1 | 1992-12-17 |
| 1028 | Lackey Bob Drilling | 32 | — | 2 | 2016-05-05 |
| 1029 | Sam J Lawand | 32 | — | 2 | 1951-07-09 |
| 1030 | Big Valley Drilling & Exploration Co. | 32 | — | 6 | 1980-08-15 |
| 1031 | United Drilling & Exploration Co. | 31 | — | 2 | 2005-03-16 |
| 1032 | Bmt Well Drilling Co. | 31 | — | 1 | 1995-06-01 |
| 1033 | Murphy Pump & Supply | 31 | — | 5 | 1994-03-18 |
| 1034 | Corder Drilling | 31 | — | 2 | 2007-04-26 |
| 1035 | J P Pilkens Water Well Drlg | 31 | — | 2 | 2005-10-10 |
| 1036 | Cliff Steele & Van Norman | 31 | — | 1 | 1953-08-28 |
| 1037 | All Well Drilling And Pump Service | 31 | — | 2 | 2016-01-28 |
| 1038 | Staal, Gardner, & Dunne, Inc. | 31 | — | 3 | 1996-03-02 |
| 1039 | S D Drilling Inc. | 31 | — | 5 | 2011-08-29 |
| 1040 | Cen Cal Drilling Inc. | 31 | — | 2 | 2016-11-22 |
| 1041 | W T Page | 31 | — | 2 | 1956-05-06 |
| 1042 | Morris Drilling | 31 | — | 1 | 1973-05-02 |
| 1043 | Beeler Brothers | 31 | — | 2 | 1961-06-30 |
| 1044 | DP Drilling | 30 | — | 5 | 1978-01-01 |
| 1045 | Bosearello Enterprises | 30 | — | 5 | 1979-11-20 |
| 1046 | Daniel F Anderson | 30 | — | 2 | 1955-12-16 |
| 1047 | Keeler Drlg Co. | 30 | — | 6 | 1977-08-10 |
| 1048 | Mclaren Environmental Engineering | 30 | — | 7 | 2006-06-30 |
| 1049 | North State Well & Pump | 30 | — | 5 | 1993-07-01 |
| 1050 | Whiting Well Drilling | 30 | — | 2 | 2006-11-10 |
| 1051 | Taber Consultants | 30 | — | 5 | 2014-06-04 |
| 1052 | U S Geological Survey | 30 | — | 16 | 2014-08-04 |
| 1053 | Scoggin Drilling & Dev Co. | 30 | — | 2 | 1955-10-01 |
| 1054 | Kechichian Well Drilling | 30 | — | 1 | 2010-06-04 |
| 1055 | Ken Hickman Well Drilling | 29 | — | 3 | 1981-01-06 |
| 1056 | W L Watkins | 29 | — | 2 | 1972-06-15 |
| 1057 | Modern Drilling | 29 | — | 3 | 2010-06-26 |
| 1058 | Morris A Balderman | 29 | — | 3 | 1999-12-27 |
| 1059 | Castlio Drilling Co. | 29 | — | 3 | 1991-10-23 |
| 1060 | Directed Technologies Drilling Inc. | 29 | — | 4 | 2019-12-13 |
| 1061 | Riley W Rummans | 29 | — | 1 | 1969-04-02 |
| 1062 | Roche Drilling Services Inc. | 29 | — | 3 | 2018-02-09 |
| 1063 | US Drilling | 29 | — | 2 | 2017-03-07 |
| 1064 | Vironex Technical Services LLC | 28 | — | 2 | 2017-04-20 |
| 1065 | William W Tarbutton | 28 | — | 2 | 1953-06-15 |
| 1066 | Don's Drilling Company | 28 | — | 2 | 2016-01-08 |
| 1067 | Aaa Pump | 28 | — | 8 | 2009-04-16 |
| 1068 | Cardno Inc. | 28 | — | 2 | 2020-03-26 |
| 1069 | Ace Drilling & Pump Co. | 27 | — | 3 | 1991-08-26 |
| 1070 | George Azevedo | 27 | — | 2 | 1976-09-15 |
| 1071 | W N (Bill) Stout | 27 | — | 3 | 1957-05-31 |
| 1072 | Teg - Northern California Inc. | 27 | — | 2 | 2013-01-16 |
| 1073 | J R Gross Wells & Pumps | 27 | — | 1 | 2016-02-22 |
| 1074 | Garrison Bros | 27 | — | 3 | 1990-10-08 |
| 1075 | Cowart & Dix | 27 | — | 2 | 1951-04-21 |
| 1076 | F M Van Norman | 27 | — | 1 | 1978-08-12 |
| 1077 | Waterwell Plus | 27 | — | 7 | 2015-12-31 |
| 1078 | Webb Drilling Company | 27 | — | 1 | 1984-04-26 |
| 1079 | Gungle Drilling | 27 | — | 3 | 1993-07-17 |
| 1080 | Harrell's | 27 | — | 3 | 1980-12-06 |
| 1081 | Danville Well Drilling Co. | 27 | — | 2 | 1978-01-30 |
| 1082 | Lively, L J, And M | 27 | — | 2 | 1948-07-01 |
| 1083 | Terry Mccormick | 26 | — | 3 | 1979-02-23 |
| 1084 | Foothill Drilling | 26 | — | 6 | 2015-05-23 |
| 1085 | Harry Crinklaw | 26 | — | 1 | 1961-10-30 |
| 1086 | Nor-Cal Pump & Well Service | 26 | — | 10 | 2013-09-27 |
| 1087 | Hill Drilling | 26 | — | 2 | 1975-04-04 |
| 1088 | Kulchin-Condon & Asso | 26 | — | 1 | 2000-02-08 |
| 1089 | Toxicological & Environmental Associates Inc. | 26 | — | 1 | 2014-09-20 |
| 1090 | Quentin Y Thayer | 26 | — | 2 | 1967-06-23 |
| 1091 | Butte Pump Service | 26 | — | 5 | 2003-12-30 |
| 1092 | Canada Bros | 25 | — | 2 | 2006-11-06 |
| 1093 | Miller & Johnson | 25 | — | 2 | 1966-08-13 |
| 1094 | P/D Drilling Co. | 25 | — | 4 | 1984-06-23 |
| 1095 | California Waterwell Serv | 25 | — | 1 | 1984-12-25 |
| 1096 | Runnels E L Well Drilling | 25 | — | 1 | 1986-10-09 |
| 1097 | R Cruse Drilling And Well Service | 25 | — | 3 | 2007-03-07 |
| 1098 | Sixkiller Rufus Henry Drilling | 25 | — | 2 | 2015-07-24 |
| 1099 | Affordable Waterwell Drilling & Pump Maintenance | 25 | — | 3 | 2017-01-19 |
| 1100 | R & M Drilling | 25 | — | 2 | 2018-08-01 |
| 1101 | Livermore Pump | 25 | — | 1 | 1993-03-26 |
| 1102 | Gary D Lowe | 25 | — | 2 | 1985-02-28 |
| 1103 | C Johnson Well Drilling & Pump | 25 | — | 2 | 1967-09-28 |
| 1104 | Russ Ervin-Well Drilling | 25 | — | 2 | 1966-07-14 |
Best well drillers by county
County-level rankings — who actually drills where, by wells on record.
- Alameda County (174)
- Alpine County (28)
- Amador County (78)
- Butte County (41)
- Calaveras County (82)
- Colusa County (30)
- Contra Costa County (148)
- Del Norte County (6)
- El Dorado County (125)
- Fresno County (274)
- Glenn County (28)
- Humboldt County (19)
- Imperial County (49)
- Inyo County (77)
- Kern County (228)
- Kings County (148)
- Lake County (25)
- Lassen County (18)
- Los Angeles County (192)
- Madera County (217)
- Marin County (78)
- Mariposa County (68)
- Mendocino County (104)
- Merced County (179)
- Modoc County (9)
- Mono County (69)
- Monterey County (148)
- Napa County (104)
- Nevada County (99)
- Orange County (108)
- Placer County (155)
- Plumas County (67)
- Riverside County (202)
- Sacramento County (204)
- San Benito County (94)
- San Bernardino County (251)
- San Diego County (151)
- San Francisco County (53)
- San Joaquin County (185)
- San Luis Obispo County (101)
- San Mateo County (116)
- Santa Barbara County (150)
- Santa Clara County (210)
- Santa Cruz County (111)
- Shasta County (30)
- Sierra County (64)
- Siskiyou County (19)
- Solano County (126)
- Sonoma County (152)
- Stanislaus County (134)
- Sutter County (95)
- Tehama County (32)
- Trinity County (16)
- Tulare County (233)
- Tuolumne County (52)
- Ventura County (148)
- Yolo County (133)
- Yuba County (121)
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