| 1 | A B C Liovin Drilling Inc. | 562 | 814 | 1,281 |
| 2 | Cascade Drilling L P | 401 | 652 | 2,827 |
| 3 | Beks Acquisition Inc. | 252 | 333 | 465 |
| 4 | J & H Drilling Co. Inc. | 243 | 274 | 978 |
| 5 | Farwest Corrosion Control Company | 238 | 799 | 2,649 |
| 6 | Yellow Jacket Drilling Services LLC | 165 | 167 | 291 |
| 7 | Bc2 Environmental LLC | 104 | 191 | 416 |
| 8 | Guardino Well Drilling Inc. | 104 | 104 | 1,736 |
| 9 | Abundant Water Wells | 64 | 64 | 173 |
| 10 | Vics Well Drilling Inc. | 63 | 123 | 337 |
| 11 | Gregg Drilling LLC | 61 | 63 | 558 |
| 12 | Lundigan Drilling | 51 | 175 | 179 |
| 13 | Bryant Pump & Drilling Company | 44 | 348 | 1,000 |
| 14 | Cascade Drilling LP | 44 | 53 | 826 |
| 15 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | 32 | 128 | 1,716 |
| 16 | Fugro Usa Land Inc. | 30 | 31 | 36 |
| 17 | Best Drilling And Pump Inc. | 27 | 45 | 248 |
| 18 | Gregg Drilling & Testing Inc. | 24 | 266 | 4,828 |
| 19 | Layne Christensen Company | 21 | 240 | 2,362 |
| 20 | National Corrosion | 20 | 20 | 28 |
| 21 | Water Well Service Inc. | 19 | 22 | 145 |
| 22 | Gregory Drilling Incorporated | 19 | 19 | 143 |
| 23 | Bertram Drilling Inc. | 18 | 60 | 1,171 |
| 24 | Corrpro Companies Inc. | 16 | 17 | 737 |
| 25 | Sierra Exploration Drilling Co. Inc. | 13 | 29 | 802 |
| 26 | Krazan & Associates | 13 | 13 | 30 |
| 27 | D C A Drilling And Construction Inc. | 10 | 20 | 69 |
| 28 | Hansen-Welldo-Service Inc. | 10 | 10 | 138 |
| 29 | Pacific Coast Well Drilling Inc. | 9 | 9 | 337 |
| 30 | American Construction And Supply Inc. | 7 | 27 | 1,685 |
| 31 | Southwest Pump & Drilling Inc. | 6 | 40 | 290 |
| 32 | Mel Meyer | 5 | 7,241 | 101,127 |
| 33 | National E W P Inc. | 4 | 44 | 431 |
| 34 | Fain Drilling & Pump Co. Inc. | 4 | 7 | 3,029 |
| 35 | Drill Hog | 3 | 3 | 74 |
| 36 | M & M Well Drilling | 3 | 3 | 74 |
| 37 | Harich Enterprises Company Inc. | 2 | 10 | 612 |
| 38 | Cascade Well Co. | 2 | 8 | 371 |
| 39 | Daugherty Pump & Drilling | 2 | 5 | 122 |
| 40 | South Valley Pump & Drilling | 2 | 2 | 69 |
| 41 | J & O Well Drilling | 2 | 2 | 159 |
| 42 | Rottman Drilling Co. | 1 | 715 | 1,331 |
| 43 | Ike's Pump & Drilling Inc. | 1 | 75 | 300 |
| 44 | Donald C Vickery Well Drilling | 1 | 11 | 150 |
| 45 | Johnson Drilling Co. | 1 | 5 | 11,865 |
| 46 | Heritage Well Service | 1 | 1 | 528 |
| 47 | Myers Brothers Well Drilling Inc. | 1 | 1 | 2,865 |
| 48 | Southern California Well Service LLC | 1 | 1 | 50 |
| 49 | Directed Technologies Drilling Inc. | 1 | 1 | 29 |
| 50 | Cascade Drilling Inc. - California | — | 905 | 3,167 |
| 51 | Aqua Drilling | — | 896 | 923 |
| 52 | Batson Drilling Service | — | 420 | 436 |
| 53 | Beylik Drilling & Pump Service | — | 311 | 1,267 |
| 54 | Water Well Supply | — | 294 | 533 |
| 55 | H-F Drilling, Inc. | — | 276 | 618 |
| 56 | Moss Roscoe Company | — | 246 | 1,220 |
| 57 | West Hazmat Drilling Corp | — | 201 | 1,702 |
| 58 | Clement D Clubb C-G Drilling | — | 178 | 192 |
| 59 | Rottman Dick Water Well Drilling | — | 177 | 211 |
| 60 | W D C Exploration & Wells | — | 160 | 2,421 |
| 61 | Testamerica Drilling Corp | — | 121 | 378 |
| 62 | Trudell Drilling Co. | — | 116 | 707 |
| 63 | Boetsch Well Drilling And Pump Service | — | 104 | 522 |
| 64 | M R Peck & Sons | — | 102 | 125 |
| 65 | O Hardcastle | — | 97 | 98 |
| 66 | M A Bryant Drilling | — | 86 | 311 |
| 67 | Ray Parnell Drilling Contractor | — | 74 | 79 |
| 68 | Cruse Drilling Co. | — | 71 | 341 |
| 69 | Council Harold Drilling Co. | — | 68 | 154 |
| 70 | Howard Pump Inc. A California Corporation | — | 66 | 1,650 |
| 71 | Beylik Drilling Inc. | — | 64 | 174 |
| 72 | Pipeline Industries-Drill Line Division | — | 62 | 84 |
| 73 | D-R Water Well Drill | — | 58 | 196 |
| 74 | C. Cruse Drilling | — | 56 | 301 |
| 75 | Mccalla Brothers | — | 54 | 578 |
| 76 | Datum Exploration Inc. | — | 51 | 223 |
| 77 | Allen's Drilling | — | 50 | 63 |
| 78 | Midwest Water Well Contracting Inc. | — | 48 | 147 |
| 79 | Diversified Drilling | — | 46 | 82 |
| 80 | Tom Seay | — | 46 | 67 |
| 81 | Shipps For Water Well | — | 44 | 54 |
| 82 | Pipe Dreams Inc. | — | 42 | 52 |
| 83 | Evans Bros | — | 39 | 107 |
| 84 | Corrosion Technology Inc. | — | 36 | 169 |
| 85 | Interstate Soils Sampling Inc. | — | 34 | 75 |
| 86 | Boart Longyear Company | — | 33 | 172 |
| 87 | Layne-Western Co. Inc. | — | 31 | 255 |
| 88 | All Well Drilling And Pump Service | — | 30 | 31 |
| 89 | A & R Drilling | — | 29 | 60 |
| 90 | Paul Neville | — | 28 | 51 |
| 91 | Saunders Brothers | — | 28 | 44 |
| 92 | L E Tomson | — | 28 | 35 |
| 93 | Morris A Balderman | — | 27 | 29 |
| 94 | Barber-Bridge Drilling Corp Ltd | — | 25 | 64 |
| 95 | Graves & Graves Drilling | — | 23 | 72 |
| 96 | Sargent Drilling | — | 21 | 442 |
| 97 | Frank Scully/Morrison Drilling Inc. | — | 21 | 582 |
| 98 | Mccalla Bros Pump And Drilling Co. | — | 21 | 229 |
| 99 | Jensen Drilling Company | — | 21 | 186 |
| 100 | Roscoe Moss Company | — | 21 | 130 |
| 101 | Arrowhead Group | — | 20 | 244 |
| 102 | Melvin A Mcfadden | — | 19 | 51 |
| 103 | Valley Well Drilling LP | — | 15 | 410 |
| 104 | Midway Drilling & Pump Company | — | 15 | 753 |
| 105 | Dales Drilling | — | 15 | 46 |
| 106 | Mclaren Environmental Engineering | — | 15 | 30 |
| 107 | Cowart & Dix | — | 15 | 27 |
| 108 | Bill Belknap | — | 14 | 2,758 |
| 109 | 3-D Drilling Company | — | 14 | 233 |
| 110 | Council Harold Drilling & Pump Service | — | 14 | 91 |
| 111 | Collum Drilling Company | — | 13 | 37 |
| 112 | Barbour Corporation | — | 11 | 88 |
| 113 | SO Cal Pump And Well Drilling | — | 10 | 158 |
| 114 | Agri-Cal Pump & Supply | — | 10 | 105 |
| 115 | Keeler Drlg Co. | — | 10 | 30 |
| 116 | Teredon Company | — | 9 | 48 |
| 117 | Maggiora Bros Drilling Inc. | — | 7 | 4,674 |
| 118 | Crum Sam Water Well Drilling Inc. | — | 7 | 591 |
| 119 | Pitcher Drilling Co. | — | 7 | 1,232 |
| 120 | Midway Drilling Xxx | — | 7 | 100 |
| 121 | Stang Hydronics Inc. | — | 7 | 56 |
| 122 | Shipps For Water Well Drilling | — | 7 | 33 |
| 123 | L O Lynch Quality Wells & Pumps Inc. | — | 6 | 3,373 |
| 124 | Enloe Well Drilling | — | 6 | 279 |
| 125 | Island Drilling | — | 6 | 221 |
| 126 | Don Redfeairn Drilling Co. | — | 6 | 186 |
| 127 | Meridian Drilling & Well Supply | — | 6 | 74 |
| 128 | Trihydro Corporation | — | 6 | 46 |
| 129 | Dechenne Water Well Drilling Inc. | — | 5 | 1,204 |
| 130 | Well Tec Services Inc. | — | 5 | 126 |
| 131 | D. W. Slooum | — | 5 | 688 |
| 132 | Tex Bassham Drilling | — | 5 | 107 |
| 133 | Gilbert Drilling | — | 5 | 107 |
| 134 | Barnes Core Drlg | — | 5 | 86 |
| 135 | Robertson Drilling Co. | — | 5 | 61 |
| 136 | Mogle Drilling & Pump Company | — | 5 | 53 |
| 137 | Wallis Water Systems | — | 4 | 688 |
| 138 | Farm Pump And Irrigation Company Inc. | — | 4 | 451 |
| 139 | Starr Drilling And Pump Co. | — | 4 | 875 |
| 140 | S A Andresen All Terrain Exploration | — | 4 | 468 |
| 141 | Burt Drilling Co. | — | 4 | 438 |
| 142 | Pierson Drilling | — | 4 | 59 |
| 143 | Mogle Brothers | — | 4 | 57 |
| 144 | Gene Dyke | — | 4 | 51 |
| 145 | Canepa And Sons Inc. | — | 3 | 3,173 |
| 146 | Arthur & Orum Well Drilling Inc. | — | 3 | 3,219 |
| 147 | George Chamberlain | — | 3 | 256 |
| 148 | Layne Environmental Services Inc. | — | 3 | 104 |
| 149 | David Engel | — | 3 | 98 |
| 150 | Cofferdam Unwatering Corporation | — | 3 | 32 |
| 151 | U S Geological Survey | — | 3 | 30 |
| 152 | Palm Springs Pump Inc. | — | 2 | 115 |
| 153 | Resonantsonic International Inc. | — | 2 | 397 |
| 154 | Spectrum Exploration Inc. | — | 2 | 307 |
| 155 | Bakersfield Pump Co. | — | 2 | 303 |
| 156 | Tri-County Drilling Inc. | — | 2 | 227 |
| 157 | Redfeairn R L Drilling | — | 2 | 195 |
| 158 | S/G Testing Laboratories Inc. | — | 2 | 187 |
| 159 | Kirkland Well Service | — | 2 | 184 |
| 160 | Chapman Pump & Drilling Company | — | 2 | 145 |
| 161 | Dyna Drill International Inc. | — | 2 | 115 |
| 162 | Robertson Bros | — | 2 | 68 |
| 163 | Scoggin Drilling Company | — | 2 | 67 |
| 164 | R Barrick For Great Sierra | — | 2 | 55 |
| 165 | Hall Construction Company | — | 2 | 49 |
| 166 | Consolidated Testing Laboratories Inc. | — | 1 | 1,405 |
| 167 | North American Drilling Company | — | 1 | 692 |
| 168 | Martell Water Systems Inc. | — | 1 | 1,094 |
| 169 | Cache Creek Drilling | — | 1 | 247 |
| 170 | Randall N Wallis | — | 1 | 531 |
| 171 | MC Dougall's Well Drilling Inc. | — | 1 | 1,345 |
| 172 | Jack Jones Wells & Pumps | — | 1 | 1,145 |
| 173 | American Drilling | — | 1 | 970 |
| 174 | Whitten Pumps Inc. | — | 1 | 874 |
| 175 | Western Well Drilling Co. Ltd | — | 1 | 842 |
| 176 | Independent Well Drilling Inc. | — | 1 | 615 |
| 177 | David And Son Drilling | — | 1 | 318 |
| 178 | D W Slocum Water Well Drilling | — | 1 | 217 |
| 179 | Howard Pump Company | — | 1 | 106 |
| 180 | Southern Sierra Drilling | — | 1 | 92 |
| 181 | R H Forney | — | 1 | 88 |
| 182 | F Lahorgue | — | 1 | 87 |
| 183 | Pacific Geoscience Inc. | — | 1 | 84 |
| 184 | Santa Rosa Drilling Co. | — | 1 | 77 |
| 185 | Peerless Welding & Machine Shop | — | 1 | 63 |
| 186 | Dell D Beck | — | 1 | 60 |
| 187 | Roche Well And Pump Company | — | 1 | 54 |
| 188 | Hacker's Pump Service | — | 1 | 51 |
| 189 | Modern Drilling | — | 1 | 29 |
| 190 | Garrison Bros | — | 1 | 27 |
| 191 | Foothill Drilling | — | 1 | 26 |
| 192 | R Cruse Drilling And Well Service | — | 1 | 25 |