| 1 | Horner & Sons Inc. | 343 | 347 | 348 |
| 2 | Bradley & Sons Inc. | 223 | 2,508 | 3,627 |
| 3 | Wellco Drilling Inc. | 211 | 1,137 | 1,375 |
| 4 | Precision Well Drilling Inc. | 124 | 174 | 189 |
| 5 | Valley Well Drilling LP | 123 | 123 | 410 |
| 6 | Strickland Enterprises Inc. | 110 | 154 | 2,026 |
| 7 | Prieto Anthony J Water Well Drilling Inc. | 108 | 108 | 637 |
| 8 | Walt Bannon Drilling Inc. | 92 | 1,560 | 2,498 |
| 9 | H & B Drilling And Sons LLC | 78 | 82 | 414 |
| 10 | Myers Brothers Well Drilling Inc. | 55 | 545 | 2,865 |
| 11 | Oasis FG Drilling | 53 | 53 | 60 |
| 12 | Anthony J Prieto | 52 | 180 | 2,330 |
| 13 | C R Well Drilling | 36 | 36 | 455 |
| 14 | Arthur & Orum Well Drilling Inc. | 35 | 482 | 3,219 |
| 15 | Living Water Well Drilling | 33 | 33 | 441 |
| 16 | Hch Water Wells Inc. | 31 | 31 | 43 |
| 17 | 99 Drilling LLC | 28 | 28 | 265 |
| 18 | Water Resource Heritage Inc. | 27 | 27 | 33 |
| 19 | Drew & Hefner Well Drilling | 25 | 25 | 43 |
| 20 | Five Star Well Drilling Inc. | 21 | 21 | 45 |
| 21 | Big River Drilling LLC | 16 | 16 | 715 |
| 22 | Allison Sierra | 14 | 57 | 127 |
| 23 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | 13 | 44 | 1,716 |
| 24 | Quality Well Drillers Inc. | 11 | 76 | 3,524 |
| 25 | Well Industries Inc. | 10 | 14 | 558 |
| 26 | Arsenal Well Drilling Inc. | 10 | 10 | 234 |
| 27 | Nor - Cal Pump & Well Drilling Inc. | 8 | 10 | 248 |
| 28 | Anderson Brothers Water Well Drilling & Domestic Pumps | 7 | 458 | 492 |
| 29 | Scott Belknap Well Drilling Inc. | 6 | 7 | 1,131 |
| 30 | Johnson Drilling Co. | 5 | 451 | 11,865 |
| 31 | Canepa And Sons Inc. | 5 | 7 | 3,173 |
| 32 | Corrpro Companies Inc. | 5 | 5 | 737 |
| 33 | Stonehouse Well Drilling | 5 | 5 | 157 |
| 34 | Gregg Drilling LLC | 4 | 4 | 558 |
| 35 | A-1 Drilling & Pump | 4 | 4 | 218 |
| 36 | DL Well Drilling | 4 | 4 | 40 |
| 37 | HP Water Systems Inc. | 4 | 4 | 55 |
| 38 | Joey's Well Drilling & Construction | 3 | 6 | 46 |
| 39 | Roadrunner Drilling & Pump Company Inc. | 3 | 4 | 205 |
| 40 | Schrack Drilling Co. | 3 | 4 | 247 |
| 41 | Jensen Kelin Drilling | 3 | 3 | 94 |
| 42 | Matthew Davis Enterprises Inc. | 3 | 3 | 40 |
| 43 | Loverin Pump & Drilling Co. | 3 | 3 | 58 |
| 44 | US Drilling | 3 | 3 | 29 |
| 45 | H & B Drilling | 2 | 1,138 | 1,248 |
| 46 | Faria Welldrilling | 2 | 236 | 250 |
| 47 | Dos Palos Well Drilling | 2 | 28 | 788 |
| 48 | Yosemite Falls Inc. | 2 | 6 | 706 |
| 49 | Boart Longyear Company | 2 | 5 | 172 |
| 50 | Modern Technology Resources Inc. | 2 | 4 | 44 |
| 51 | N A F F C O Pump And Well Inc. | 2 | 4 | 40 |
| 52 | American Technological Drilling Service Inc. | 1 | 1,094 | 1,385 |
| 53 | Bannon Walt Drilling Co. Inc. | 1 | 546 | 978 |
| 54 | Moosios Pump Co. Inc. | 1 | 88 | 127 |
| 55 | Valley Well & Pump Co. Inc. | 1 | 54 | 308 |
| 56 | Grabow Well Drilling Company | 1 | 48 | 2,646 |
| 57 | Van Loon Jack | 1 | 43 | 49 |
| 58 | Blake Hennings | 1 | 26 | 1,362 |
| 59 | B & B Well Drilling Incorporated | 1 | 2 | 390 |
| 60 | Kings River Drilling LLC | 1 | 2 | 194 |
| 61 | Beymer Well Service | 1 | 2 | 2,921 |
| 62 | Weeks Drilling And Pump Co. | 1 | 1 | 14,789 |
| 63 | Best Drilling And Pump Inc. | 1 | 1 | 248 |
| 64 | J & O Well Drilling | 1 | 1 | 159 |
| 65 | Barbour Well Inc. | 1 | 1 | 32 |
| 66 | Gregg Drilling & Testing Inc. | 1 | 1 | 4,828 |
| 67 | Belknap Scott M Well Drilling | 1 | 1 | 272 |
| 68 | Atwater Well Drilling | 1 | 1 | 40 |
| 69 | Roche Drilling Services Inc. | 1 | 1 | 29 |
| 70 | Fox Gary & Co. | — | 928 | 1,185 |
| 71 | Davis & Davis Well Drilling | — | 295 | 315 |
| 72 | Signal Drilling Company | — | 276 | 8,301 |
| 73 | Herb Schwartz & Son Inc. | — | 271 | 875 |
| 74 | Fronk's Mountain Drilling | — | 200 | 2,378 |
| 75 | Anderson Pump Company | — | 184 | 299 |
| 76 | Bill Belknap | — | 146 | 2,758 |
| 77 | Kenneth J Mcavoy | — | 145 | 161 |
| 78 | Myers Brothers Inc. | — | 136 | 796 |
| 79 | Gehrke-Bloomer | — | 122 | 160 |
| 80 | Levnard T Larson | — | 121 | 681 |
| 81 | Richardson Ernest Walker | — | 101 | 129 |
| 82 | B & W Drilling | — | 91 | 132 |
| 83 | Bloomer E | — | 88 | 102 |
| 84 | Sierra Drilling Co. | — | 80 | 99 |
| 85 | Ritchey Bros | — | 77 | 183 |
| 86 | Tezak Pump Co. Inc. | — | 73 | 2,380 |
| 87 | Orin F Gaskin & Edward F Swiecki Drilling | — | 72 | 75 |
| 88 | K F Guernsey | — | 67 | 119 |
| 89 | Myers Reverse, Inc. | — | 66 | 2,389 |
| 90 | Harvey Gehrke | — | 57 | 63 |
| 91 | Gary Fox & Co. | — | 50 | 82 |
| 92 | Aquarius Drilling And Pump Co. | — | 47 | 288 |
| 93 | Jvl Water Well Drilling | — | 46 | 52 |
| 94 | C E Cates Well Drilling | — | 43 | 108 |
| 95 | Herbert Schwartz & Son | — | 38 | 377 |
| 96 | W D C Exploration & Wells | — | 37 | 2,421 |
| 97 | Mariposa Well Drilling Company Inc. | — | 33 | 1,146 |
| 98 | Floyd's Well Drilling | — | 33 | 58 |
| 99 | Andy Noblin | — | 33 | 39 |
| 100 | T C B Well Drilling Co. | — | 33 | 35 |
| 101 | Stroming Machinery | — | 32 | 2,391 |
| 102 | Mel Meyer | — | 30 | 101,127 |
| 103 | Hall Thomas A | — | 30 | 1,789 |
| 104 | Kechichian Well Drilling | — | 30 | 30 |
| 105 | Weldon Francis M | — | 28 | 652 |
| 106 | Layne-Western Co. Inc. | — | 28 | 255 |
| 107 | Crwelldrilling | — | 27 | 266 |
| 108 | Tcb Well Drilling | — | 27 | 32 |
| 109 | A C Waller | — | 23 | 69 |
| 110 | Russ Ervin-Well Drilling | — | 23 | 25 |
| 111 | Diversified Exploration Co. Inc. | — | 22 | 751 |
| 112 | Cates Lloyd Drilling | — | 21 | 56 |
| 113 | Clovis Pump & Water Well | — | 20 | 323 |
| 114 | Bootjack Drilling Inc. | — | 19 | 649 |
| 115 | Verne Guernsey | — | 19 | 137 |
| 116 | Herbert Schwartz | — | 16 | 389 |
| 117 | E & S Water Well Drilling | — | 16 | 58 |
| 118 | M P Burgess | — | 15 | 313 |
| 119 | Curtis Hole Drilling Company | — | 15 | 187 |
| 120 | Seanaco Inc. | — | 14 | 327 |
| 121 | Hennings Bros Drilling Co. Inc. | — | 13 | 6,823 |
| 122 | Yosemite Falls Well Drilling | — | 13 | 464 |
| 123 | Johnson Teddy J | — | 13 | 797 |
| 124 | Hydro Resources - West Inc. | — | 13 | 97 |
| 125 | Westside Drilling & Development Co. | — | 13 | 77 |
| 126 | Calwater Drilling Company Inc. | — | 12 | 5,421 |
| 127 | Henry Kozera | — | 11 | 448 |
| 128 | P H Thurman | — | 11 | 277 |
| 129 | Pearson Well Drilling | — | 11 | 176 |
| 130 | Gateway Drilling | — | 11 | 87 |
| 131 | Myers And Summers | — | 11 | 75 |
| 132 | Winter Abajian Well Drilling | — | 10 | 203 |
| 133 | R R Kemp | — | 10 | 135 |
| 134 | Arthur's Well Drilling | — | 10 | 41 |
| 135 | Martin Pump & Supply Inc. | — | 9 | 2,524 |
| 136 | Eaton Drilling Co. LLC | — | 8 | 3,793 |
| 137 | Rasmussen Well & Pump | — | 8 | 88 |
| 138 | Clovis Well Drilling | — | 8 | 77 |
| 139 | Abajian Seth Well Drilling | — | 8 | 41 |
| 140 | Maggiora Bros Drilling Inc. | — | 7 | 4,674 |
| 141 | H-F Drilling, Inc. | — | 6 | 618 |
| 142 | Wasco Drilling Company, Inc. | — | 6 | 554 |
| 143 | Sears Well Drilling | — | 6 | 376 |
| 144 | Everett A Loewenstein | — | 6 | 357 |
| 145 | Golden Empire Drilling | — | 6 | 168 |
| 146 | C O Brose Well Drilling | — | 5 | 698 |
| 147 | Resonantsonic International Inc. | — | 5 | 397 |
| 148 | Jack C Guernsey | — | 5 | 51 |
| 149 | CR Well Drilling | — | 5 | 48 |
| 150 | Bertram Drilling Inc. | — | 4 | 1,171 |
| 151 | Schramm Drilling & Pump Co. | — | 4 | 762 |
| 152 | Trudell Drilling Co. | — | 4 | 707 |
| 153 | Xxx | — | 4 | 113 |
| 154 | All American Water Supply OF California Inc. | — | 4 | 40 |
| 155 | Ace Drilling & Pump Co. | — | 4 | 27 |
| 156 | Guardino Well Drilling Inc. | — | 3 | 1,736 |
| 157 | Consolidated Testing Laboratories Inc. | — | 3 | 1,405 |
| 158 | Cascade Drilling Inc. - California | — | 3 | 3,167 |
| 159 | Moss Roscoe Company | — | 3 | 1,220 |
| 160 | Simpson Drilling Company | — | 3 | 644 |
| 161 | Osterberg And Stewart | — | 3 | 636 |
| 162 | David And Son Drilling | — | 3 | 318 |
| 163 | Strickland Drilling | — | 3 | 201 |
| 164 | Myers Well Drilling Inc. | — | 2 | 763 |
| 165 | Western Well Drilling Co. Ltd | — | 2 | 842 |
| 166 | C F Dougherty | — | 2 | 685 |
| 167 | Rock Well Drilling | — | 2 | 543 |
| 168 | S A Andresen All Terrain Exploration | — | 2 | 468 |
| 169 | Weimer Stan Enterprises Inc. | — | 2 | 377 |
| 170 | Rockwell Drilling Co. | — | 2 | 244 |
| 171 | Island Drilling | — | 2 | 221 |
| 172 | John A Brandt | — | 2 | 143 |
| 173 | Soilprobe Inc. | — | 2 | 133 |
| 174 | Jack Carrell Drilling Inc. | — | 2 | 123 |
| 175 | ED Severin | — | 2 | 60 |
| 176 | Anderson G C Drilling & Pump | — | 2 | 53 |
| 177 | Joe W Baker | — | 2 | 48 |
| 178 | Moore Twining Associates Inc. | — | 2 | 46 |
| 179 | Hoffman J F Well Driller | — | 2 | 41 |
| 180 | DP Drilling | — | 2 | 30 |
| 181 | Hill Drilling | — | 2 | 26 |
| 182 | Nor-Cal Pump & Well Service | — | 2 | 26 |
| 183 | Masellis Drilling Inc. | — | 1 | 6,081 |
| 184 | Granite Drilling Company | — | 1 | 476 |
| 185 | Pacific Coast Well Drilling Inc. | — | 1 | 337 |
| 186 | Layne Christensen Company | — | 1 | 2,362 |
| 187 | MC Lean & Williams Inc. | — | 1 | 830 |
| 188 | Bryant Pump & Drilling Company | — | 1 | 1,000 |
| 189 | Hearn Drilling Co. | — | 1 | 492 |
| 190 | DE LA Grange & Sons Inc. | — | 1 | 263 |
| 191 | Maranatha Drilling And Pump Service | — | 1 | 307 |
| 192 | Cache Creek Drilling | — | 1 | 247 |
| 193 | Chappell Pump & Supply Inc. | — | 1 | 927 |
| 194 | Cascade Drilling L P | — | 1 | 2,827 |
| 195 | Beylik Drilling & Pump Service | — | 1 | 1,267 |
| 196 | Starr Drilling And Pump Co. | — | 1 | 875 |
| 197 | Whitten Pumps Inc. | — | 1 | 874 |
| 198 | Freedom General Repair & Pump Shop | — | 1 | 690 |
| 199 | Valley Pump & Drilling Co. | — | 1 | 475 |
| 200 | Brown Elvin | — | 1 | 422 |
| 201 | Big Valley Water LLC | — | 1 | 356 |
| 202 | Melvin Slate Water Well Drilling | — | 1 | 310 |
| 203 | Olson's Plbg & Heating | — | 1 | 308 |
| 204 | Bakersfield Pump Co. | — | 1 | 303 |
| 205 | Cullum Systems Incorporated | — | 1 | 277 |
| 206 | Pacific Gas And Electric Company | — | 1 | 264 |
| 207 | Castle Construction & Well Drilling Inc. | — | 1 | 142 |
| 208 | Crisp & Sons Well Drilling | — | 1 | 136 |
| 209 | Dodson Contracting Co. | — | 1 | 113 |
| 210 | L. Wade Inc. | — | 1 | 93 |
| 211 | A & S Pump Service | — | 1 | 88 |
| 212 | Barbour Corporation | — | 1 | 88 |
| 213 | D P Well Drilling | — | 1 | 60 |
| 214 | Terry Well Drilling | — | 1 | 58 |
| 215 | Stang Hydronics Inc. | — | 1 | 56 |
| 216 | Bert Belknap | — | 1 | 50 |
| 217 | George Azevedo | — | 1 | 27 |