| 1 | Haynes & Sons Well Drilling | 343 | 1,074 | 1,242 |
| 2 | Big River Drilling LLC | 223 | 232 | 715 |
| 3 | B & B Well Drilling Incorporated | 93 | 165 | 390 |
| 4 | Myers Well Drilling Inc. | 66 | 273 | 763 |
| 5 | Grabow Well Drilling Company | 63 | 908 | 2,646 |
| 6 | Myers Brothers Well Drilling Inc. | 58 | 298 | 2,865 |
| 7 | Rodrigues Pump Company | 45 | 46 | 61 |
| 8 | Layne Christensen Company | 34 | 82 | 2,362 |
| 9 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | 31 | 88 | 1,716 |
| 10 | Strickland Enterprises Inc. | 31 | 64 | 2,026 |
| 11 | Scott Belknap Well Drilling Inc. | 29 | 33 | 1,131 |
| 12 | Farwest Corrosion Control Company | 27 | 81 | 2,649 |
| 13 | King Pump And Well, Inc. | 25 | 25 | 47 |
| 14 | Prieto Anthony J Water Well Drilling Inc. | 17 | 17 | 637 |
| 15 | Matthew A. Bass | 16 | 17 | 62 |
| 16 | Best Drilling And Pump Inc. | 9 | 15 | 248 |
| 17 | Schrack Drilling Co. | 9 | 14 | 247 |
| 18 | Anthony J Prieto | 8 | 97 | 2,330 |
| 19 | Bradley & Sons Inc. | 8 | 23 | 3,627 |
| 20 | Arthur & Orum Well Drilling Inc. | 6 | 155 | 3,219 |
| 21 | Maggiora Bros Drilling Inc. | 6 | 7 | 4,674 |
| 22 | 99 Drilling LLC | 6 | 6 | 265 |
| 23 | H & B Drilling And Sons LLC | 5 | 6 | 414 |
| 24 | Arsenal Well Drilling Inc. | 5 | 5 | 234 |
| 25 | A-1 Drilling & Pump | 4 | 4 | 218 |
| 26 | M L Well Drilling And Pumps Co. | 4 | 4 | 411 |
| 27 | Eaton Drilling Co. LLC | 3 | 73 | 3,793 |
| 28 | Pacific Coast Well Drilling Inc. | 3 | 4 | 337 |
| 29 | Nor - Cal Pump & Well Drilling Inc. | 3 | 4 | 248 |
| 30 | Camp S A Pump Company | 3 | 3 | 497 |
| 31 | Five Star Well Drilling Inc. | 3 | 3 | 45 |
| 32 | Signal Drilling Company | 2 | 254 | 8,301 |
| 33 | Affordable Waterwell Drilling & Pump Maintenance | 2 | 3 | 25 |
| 34 | Cascade Drilling LP | 2 | 2 | 826 |
| 35 | DL Well Drilling | 2 | 2 | 40 |
| 36 | Petro - Lud Inc. | 2 | 2 | 26 |
| 37 | Pitcher Drilling Co. | 2 | 2 | 1,232 |
| 38 | Big Valley Water LLC | 1 | 141 | 356 |
| 39 | Farm Pump And Irrigation Company Inc. | 1 | 20 | 451 |
| 40 | Belknap Pump Company Inc. | 1 | 4 | 340 |
| 41 | Big Dog Drilling Inc. | 1 | 3 | 70 |
| 42 | Valley Well Drilling LP | 1 | 1 | 410 |
| 43 | Hch Water Wells Inc. | 1 | 1 | 43 |
| 44 | Drew & Hefner Well Drilling | 1 | 1 | 43 |
| 45 | South Valley Pump & Drilling | 1 | 1 | 69 |
| 46 | J & O Well Drilling | 1 | 1 | 159 |
| 47 | National Corrosion | 1 | 1 | 28 |
| 48 | Bertram Drilling Inc. | 1 | 1 | 1,171 |
| 49 | N A F F C O Pump And Well Inc. | 1 | 1 | 40 |
| 50 | Myers Reverse, Inc. | — | 1,044 | 2,389 |
| 51 | Slate And Skaggs | — | 509 | 522 |
| 52 | Melvin Slate Water Well Drilling | — | 287 | 310 |
| 53 | Knapp & Graham Inc. | — | 110 | 596 |
| 54 | Myers Brothers Inc. | — | 82 | 796 |
| 55 | Bill Belknap | — | 78 | 2,758 |
| 56 | Bass Drilling | — | 64 | 154 |
| 57 | Raymond L Olson | — | 62 | 350 |
| 58 | Valley Pump & Dairy Systems Inc. | — | 50 | 79 |
| 59 | Midway Drilling & Pump Company | — | 47 | 753 |
| 60 | C O Brose Well Drilling | — | 47 | 698 |
| 61 | Mel Meyer | — | 37 | 101,127 |
| 62 | Hall Thomas A | — | 33 | 1,789 |
| 63 | Arthur T Ball | — | 31 | 37 |
| 64 | Whitten Pumps Inc. | — | 29 | 874 |
| 65 | Tezak Pump Co. Inc. | — | 26 | 2,380 |
| 66 | Cascade Drilling Inc. - California | — | 22 | 3,167 |
| 67 | Nelson & Wilcox | — | 21 | 124 |
| 68 | Xxx | — | 21 | 113 |
| 69 | L M Quinn | — | 20 | 44 |
| 70 | Oscar L Nation | — | 16 | 431 |
| 71 | Barnes Core Drlg | — | 16 | 86 |
| 72 | Valley Well & Pump Co. Inc. | — | 15 | 308 |
| 73 | C. Cruse Drilling | — | 15 | 301 |
| 74 | Cruse Drilling Co. | — | 14 | 341 |
| 75 | L. Wade Inc. | — | 14 | 93 |
| 76 | Johnson Drilling Co. | — | 13 | 11,865 |
| 77 | Arthur F Loper | — | 12 | 123 |
| 78 | Terry Well Drilling | — | 12 | 58 |
| 79 | Winter Abajian Well Drilling | — | 10 | 203 |
| 80 | American Construction And Supply Inc. | — | 9 | 1,685 |
| 81 | Golden Empire Drilling | — | 9 | 168 |
| 82 | Layne-Western Co. Inc. | — | 8 | 255 |
| 83 | Water Well Service Inc. | — | 7 | 145 |
| 84 | W D C Exploration & Wells | — | 7 | 2,421 |
| 85 | Roger L. Nation | — | 7 | 796 |
| 86 | Moore Twining Associates Inc. | — | 6 | 46 |
| 87 | Dail Rhoads Well Drilling | — | 5 | 95 |
| 88 | Canepa And Sons Inc. | — | 4 | 3,173 |
| 89 | Seanaco Inc. | — | 4 | 327 |
| 90 | Clovis Pump & Water Well | — | 4 | 323 |
| 91 | S/G Testing Laboratories Inc. | — | 4 | 187 |
| 92 | Nation Well Drilling | — | 4 | 150 |
| 93 | F P I Well Drilling Inc. | — | 4 | 96 |
| 94 | Gregg Drilling & Testing Inc. | — | 3 | 4,828 |
| 95 | Beylik Drilling & Pump Service | — | 3 | 1,267 |
| 96 | Fox Gary & Co. | — | 3 | 1,185 |
| 97 | Brown Elvin | — | 3 | 422 |
| 98 | Williams Well Drilling | — | 3 | 376 |
| 99 | Pacific Gas And Electric Company | — | 3 | 264 |
| 100 | Sage Bros Drilling Co. | — | 3 | 232 |
| 101 | D L Rinker | — | 3 | 111 |
| 102 | Olson Well Drilling | — | 3 | 84 |
| 103 | Premier Drilling Company | — | 3 | 43 |
| 104 | All American Water Supply OF California Inc. | — | 3 | 40 |
| 105 | Guardino Well Drilling Inc. | — | 2 | 1,736 |
| 106 | Consolidated Testing Laboratories Inc. | — | 2 | 1,405 |
| 107 | Diversified Exploration Co. Inc. | — | 2 | 751 |
| 108 | D. W. Slooum | — | 2 | 688 |
| 109 | Clark Albert M | — | 2 | 181 |
| 110 | Soilprobe Inc. | — | 2 | 133 |
| 111 | Ira M Earp Well Drilling | — | 2 | 104 |
| 112 | Brand & Water Wells | — | 2 | 88 |
| 113 | Criswell Drilling Co. | — | 2 | 77 |
| 114 | Myers And Summers | — | 2 | 75 |
| 115 | Carver Pump & Drilling Inc. | — | 2 | 56 |
| 116 | Walt Bannon Drilling Inc. | — | 1 | 2,498 |
| 117 | Exploration Geoservices Inc. | — | 1 | 956 |
| 118 | Randall N Wallis | — | 1 | 531 |
| 119 | Cascade Drilling L P | — | 1 | 2,827 |
| 120 | H & B Drilling | — | 1 | 1,248 |
| 121 | Western Well Drilling Co. Ltd | — | 1 | 842 |
| 122 | Owens Drilling Co., Inc. | — | 1 | 805 |
| 123 | Landino Construction And Well Drilling | — | 1 | 703 |
| 124 | Levnard T Larson | — | 1 | 681 |
| 125 | Wasco Drilling Company, Inc. | — | 1 | 554 |
| 126 | Rock Well Drilling | — | 1 | 543 |
| 127 | Valley Pump & Drilling Co. | — | 1 | 475 |
| 128 | Lott Drilling Co. | — | 1 | 378 |
| 129 | Pearson Pump And Drillling Company Inc. | — | 1 | 366 |
| 130 | Fred H King | — | 1 | 267 |
| 131 | Fred W Porter & Son | — | 1 | 207 |
| 132 | Redfeairn R L Drilling | — | 1 | 195 |
| 133 | Don Redfeairn Drilling Co. | — | 1 | 186 |
| 134 | Beylik Drilling Inc. | — | 1 | 174 |
| 135 | Gehrke-Bloomer | — | 1 | 160 |
| 136 | Scott Xxx PC Exploration Inc. | — | 1 | 154 |
| 137 | H C Steines | — | 1 | 115 |
| 138 | Well Drilling | — | 1 | 100 |
| 139 | Gary Fox & Co. | — | 1 | 82 |
| 140 | Westside Drilling & Development Co. | — | 1 | 77 |
| 141 | Clovis Well Drilling | — | 1 | 77 |
| 142 | L & L Well Drilling | — | 1 | 76 |
| 143 | Nuner Well Drilling | — | 1 | 73 |
| 144 | Floyd's Well Drilling | — | 1 | 58 |
| 145 | Abajian Seth Well Drilling | — | 1 | 41 |
| 146 | Hutton Drilling | — | 1 | 34 |
| 147 | Harrell's | — | 1 | 27 |