Colorado Well Drillers Directory
Every company that appears as the driller of record in the Colorado Division of Water Resources (DWR) well permit database, ranked by the number of wells they have drilled. 510 Colorado drilling companies account for 271,479 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.
510drilling companies
83active since 2022
271,479wells on record
Companies with at least 25 wells on record. "Active" counts wells completed since 2022.
| # | Company | Wells | Since 2022 | Counties | Most recent |
|---|---|---|---|---|---|
| 1 | Crandall Drilling & Pump Service | 3,578 | 884 | 19 | 2026-06-10 |
| 2 | Kunau Drilling LLC | 7,197 | 713 | 24 | 2026-07-16 |
| 3 | James Drilling Company | 6,736 | 549 | 32 | 2026-06-03 |
| 4 | Hamacher Well Works Inc. | 10,447 | 509 | 29 | 2026-07-02 |
| 5 | Shelton Drilling Corporation | 6,161 | 450 | 31 | 2026-06-18 |
| 6 | Heersink Drilling | 1,819 | 434 | 13 | 2026-07-27 |
| 7 | American Drilling Service | 3,555 | 363 | 20 | 2026-06-05 |
| 8 | Ingram Drilling Inc. | 5,076 | 352 | 17 | 2026-06-12 |
| 9 | Allen Drilling & Excavating Co., Inc. | 3,788 | 319 | 15 | 2026-06-30 |
| 10 | Valley Pump Company | 2,578 | 311 | 29 | 2026-06-24 |
| 11 | Arkansas Valley Drilling | 3,041 | 306 | 15 | 2026-06-29 |
| 12 | Kelley Dewatering And Construction Company | 538 | 294 | 24 | 2025-11-13 |
| 13 | Hier Drilling Co. Inc. | 9,664 | 276 | 29 | 2026-06-12 |
| 14 | Black Mountain Drilling | 996 | 263 | 6 | 2026-04-29 |
| 15 | Mccracken Well Drilling Inc. | 734 | 217 | 18 | 2026-07-14 |
| 16 | Golden Eagle Drilling Corporation | 3,981 | 211 | 25 | 2026-05-28 |
| 17 | Finney Drilling | 1,283 | 210 | 10 | 2026-05-18 |
| 18 | Asap Well Drilling Inc. | 1,109 | 191 | 11 | 2026-01-24 |
| 19 | Wellstone Services, LLC | 583 | 172 | 9 | 2026-05-07 |
| 20 | Arrow Drilling | 2,709 | 165 | 24 | 2026-05-28 |
| 21 | Sharpe Drilling Co. | 994 | 159 | 27 | 2026-07-15 |
| 22 | Holland And Sons Water Well Drilling | 275 | 151 | 8 | 2026-07-01 |
| 23 | Schaal Drilling Co. | 2,203 | 150 | 24 | 2026-06-01 |
| 24 | Newbanks Pump Inc. | 498 | 149 | 14 | 2026-05-19 |
| 25 | Winegar Well Service | 169 | 147 | 15 | 2026-04-03 |
| 26 | Authentic Drilling | 281 | 138 | 27 | 2026-04-22 |
| 27 | High Desert Irrigation LLC | 1,942 | 134 | 13 | 2026-06-03 |
| 28 | Wildcat Drilling & Pump, Inc. | 1,254 | 132 | 16 | 2026-06-16 |
| 29 | Ojo Spring Drilling & Well Service | 706 | 120 | 12 | 2026-07-08 |
| 30 | Dak Drilling LLC | 1,696 | 118 | 15 | 2026-03-20 |
| 31 | Canfield Drilling Company | 3,439 | 115 | 28 | 2026-06-10 |
| 32 | Hydro Resources | 307 | 114 | 21 | 2026-06-10 |
| 33 | Pearson Drilling & Pump Service | 491 | 111 | 12 | 2026-06-05 |
| 34 | C. R. Smith Drilling | 2,039 | 97 | 17 | 2026-06-02 |
| 35 | The Connector LLC | 451 | 88 | 9 | 2025-12-31 |
| 36 | Aztec Drilling Company | 1,235 | 86 | 13 | 2026-06-24 |
| 37 | Complete Water Solutions | 152 | 85 | 4 | 2026-04-25 |
| 38 | Williams Drilling Co. Inc. | 230 | 84 | 4 | 2026-04-24 |
| 39 | Young's Drilling & Pump Services | 1,840 | 80 | 18 | 2026-06-15 |
| 40 | Artesian Services Inc. | 221 | 78 | 12 | 2026-08-18 |
| 41 | Sargent Irrigation Company | 111 | 76 | 8 | 2026-05-19 |
| 42 | M&s Drilling, Inc. | 864 | 75 | 9 | 2026-05-07 |
| 43 | Quality Well & Pump LLC | 702 | 74 | 11 | 2026-06-01 |
| 44 | Living Water Systems Inc. | 3,572 | 60 | 20 | 2026-04-02 |
| 45 | Broce Drilling | 403 | 60 | 14 | 2026-07-01 |
| 46 | Allen Drilling Inc. | 222 | 59 | 4 | 2025-12-11 |
| 47 | Pavati Pumps & Drilling | 128 | 59 | 6 | 2026-03-13 |
| 48 | Ucolo Drilling LLC | 255 | 55 | 5 | 2026-05-08 |
| 49 | Cooper Drilling LLC | 875 | 54 | 10 | 2026-06-02 |
| 50 | Can-America Drilling, Inc. | 5,159 | 49 | 45 | 2024-09-07 |
| 51 | Black Mountain Enterprises LLC | 3,016 | 48 | 11 | 2025-12-15 |
| 52 | Trident Drilling LLC | 97 | 47 | 8 | 2026-02-12 |
| 53 | Johns Well Service | 123 | 45 | 9 | 2026-06-10 |
| 54 | Beeman Bros Drilling Inc. | 3,538 | 44 | 17 | 2026-05-11 |
| 55 | Parker Drilling/Pump Service Inc. | 2,530 | 38 | 9 | 2026-02-27 |
| 56 | Boday Well Drilling | 1,243 | 36 | 7 | 2024-08-09 |
| 57 | Kemp's Well Service | 567 | 36 | 9 | 2026-05-23 |
| 58 | Alpine Remediation, Inc. | 84 | 35 | 11 | 2026-03-30 |
| 59 | Nwp Drilling & Consulting | 634 | 30 | 25 | 2025-11-15 |
| 60 | Environmental Works Inc. | 50 | 30 | 11 | 2026-06-11 |
| 61 | Himes Drilling Co. Inc. | 218 | 29 | 12 | 2026-03-24 |
| 62 | Andreatta Well Service LLC | 43 | 26 | 5 | 2026-06-15 |
| 63 | Glover's Drilling | 913 | 25 | 9 | 2026-01-30 |
| 64 | Konkel Drilling | 191 | 24 | 6 | 2026-04-24 |
| 65 | Trinity Water Solutions, LLC | 61 | 23 | 7 | 2024-11-13 |
| 66 | Bob Williams Drilling Co. | 3,521 | 22 | 17 | 2026-01-01 |
| 67 | Twin Peaks Drilling | 475 | 22 | 19 | 2025-12-19 |
| 68 | Water Pump Supply | 450 | 22 | 8 | 2026-05-01 |
| 69 | Vine Laboratories, Inc. | 167 | 22 | 11 | 2026-07-20 |
| 70 | Rocky Mountain Waterworks LLC | 893 | 19 | 15 | 2025-09-08 |
| 71 | Boart Longyear Company | 26 | 18 | 6 | 2025-08-27 |
| 72 | Remington Technologies, LLC | 25 | 18 | 3 | 2026-05-20 |
| 73 | Mack's Drilling Inc. | 121 | 17 | 5 | 2026-05-29 |
| 74 | Layne A Granite Company | 35 | 15 | 13 | 2025-11-24 |
| 75 | Rocky Mtn Drilling And Pump Services LLC | 338 | 14 | 9 | 2025-09-01 |
| 76 | Mccoy Water Well/Precision Drilling | 88 | 14 | 12 | 2026-04-20 |
| 77 | Terracon Consultants Inc. | 391 | 11 | 27 | 2026-06-01 |
| 78 | Cascade Drilling, LP | 70 | 10 | 19 | 2025-04-10 |
| 79 | Dmw Well & Pump Service | 174 | 9 | 13 | 2025-10-08 |
| 80 | Layne, Christensen Co. | 1,963 | 8 | 39 | 2025-06-14 |
| 81 | Groundwater Dev. Inc. | 214 | 8 | 10 | 2026-04-21 |
| 82 | Burk Drilling Inc. | 625 | 6 | 9 | 2025-09-30 |
| 83 | Aqua Tec Systems, Inc. | 25 | 5 | 9 | 2023-09-18 |
| 84 | Eastwood Drilling | 1,739 | 4 | 22 | 2025-10-15 |
| 85 | B & B Water Well Service Inc. | 59 | 4 | 6 | 2024-10-08 |
| 86 | Yellow Jacket Drilling Services LLC | 38 | 4 | 4 | 2025-06-10 |
| 87 | Valley Drilling Co. | 1,166 | 3 | 15 | 2022-08-23 |
| 88 | Holden & Holden | 1,000 | 3 | 23 | 2025-07-07 |
| 89 | Grosch Irrigation Co. Inc. | 210 | 3 | 18 | 2026-04-29 |
| 90 | Downey Drilling Inc. | 70 | 3 | 9 | 2024-06-12 |
| 91 | Avco Ventures Inc. | 32 | 3 | 4 | 2025-09-05 |
| 92 | Rmpd, Ltd Dba Rocky Mtn Pump & Drilling | 1,204 | 2 | 6 | 2025-08-22 |
| 93 | Schroder Drilling | 123 | 2 | 5 | 2024-12-20 |
| 94 | Nequette Drilling | 2,191 | 1 | 12 | 2022-05-12 |
| 95 | Beiriger & Sons Irrigation | 416 | 1 | 4 | 2022-04-23 |
| 96 | Hegwood Drilling | 213 | 1 | 5 | 2025-12-10 |
| 97 | Kugler Sales & Service | 111 | 1 | 8 | 2024-10-22 |
| 98 | Central Pump Company | 75 | 1 | 9 | 2024-12-15 |
| 99 | Dment | 39 | 1 | 12 | 2023-11-04 |
| 100 | Fletcher Drilling | 3,523 | — | 11 | 2010-05-26 |
| 101 | Ground Water Systems Inc. | 3,481 | — | 17 | 2021-10-27 |
| 102 | Woods Drilling Inc. | 3,293 | — | 17 | 2009-10-13 |
| 103 | Ernie's Mountain Drilling Inc. | 3,118 | — | 14 | 2008-09-01 |
| 104 | Wellstone Industries Dba Twiss & Wilson Drilling Inc. | 2,730 | — | 10 | 2013-10-02 |
| 105 | Mcpherson Drilling Company | 2,664 | — | 23 | 2009-09-30 |
| 106 | Aspen Drilling Company Inc. | 2,648 | — | 30 | 2017-04-10 |
| 107 | Lesh Drilling Inc. | 2,470 | — | 17 | 2017-04-04 |
| 108 | M & B Drilling Co. | 2,291 | — | 14 | 2004-11-21 |
| 109 | Leslie George Canfield | 2,170 | — | 16 | 2013-09-03 |
| 110 | Virginia Drilling Co. Inc. | 2,167 | — | 39 | 2010-09-01 |
| 111 | Walton, | 2,156 | — | 16 | 2003-11-30 |
| 112 | Hersh & Son Well Drilling Inc. | 2,015 | — | 17 | 1999-03-22 |
| 113 | Stewart Drilling Co. | 2,007 | — | 23 | 2009-11-08 |
| 114 | Inter Mountain Drilling Ltd. | 1,946 | — | 13 | 1993-04-03 |
| 115 | Don Eastwood Drilling Inc. | 1,672 | — | 23 | 2013-02-18 |
| 116 | Norris & Sons | 1,573 | — | 14 | 2009-11-07 |
| 117 | Mortimer Water Well Drilling | 1,537 | — | 7 | 2005-08-10 |
| 118 | John's Drilling Inc. | 1,460 | — | 16 | 2006-11-25 |
| 119 | Ground Exploration LLC | 1,454 | — | 36 | 2018-06-29 |
| 120 | Reaksecker Well Drilling | 1,435 | — | 22 | 2016-05-16 |
| 121 | Buena Vista Drilling | 1,367 | — | 17 | 1992-08-17 |
| 122 | Stan's Drilling | 1,365 | — | 10 | 2005-03-20 |
| 123 | Hoffman | 1,335 | — | 20 | 2012-03-21 |
| 124 | Collins Drilling Co. | 1,331 | — | 12 | 2005-06-15 |
| 125 | Bill Kissner Drilling Inc. | 1,313 | — | 16 | 2016-07-01 |
| 126 | Glenn A. Clement | 1,297 | — | 12 | 2017-02-17 |
| 127 | Whitewater Drilling Inc. | 1,277 | — | 12 | 2016-10-18 |
| 128 | Roger Schocke Well Drlg. Inc. | 1,230 | — | 13 | 2009-08-02 |
| 129 | W. V. Harding & Sons | 1,161 | — | 17 | 1995-11-10 |
| 130 | Steve Shelton Drilling, Inc. | 1,160 | — | 20 | 2016-03-20 |
| 131 | V. J. Stewart Drilling Co. | 1,156 | — | 13 | 1999-08-03 |
| 132 | James Storm | 1,117 | — | 22 | 1995-07-17 |
| 133 | Boyles Bros. Drilling Co. | 1,088 | — | 23 | 1996-04-16 |
| 134 | Dreiling Drilling Co. Inc. | 1,083 | — | 20 | 2010-04-03 |
| 135 | Irrigation Engineering & Supp. | 1,027 | — | 14 | 1997-11-27 |
| 136 | Alpine Drilling & Pump Co. | 980 | — | 22 | 2003-02-06 |
| 137 | Alpine Drilling Service | 965 | — | 11 | 2005-06-07 |
| 138 | Paul Fletcher & Sons Inc. | 965 | — | 6 | 2009-04-08 |
| 139 | Worosello Drilling Inc. | 945 | — | 11 | 2002-11-07 |
| 140 | Waneka & Son Drilling | 890 | — | 11 | 2005-05-25 |
| 141 | Mccoy Drilling Inc. | 887 | — | 12 | 2006-02-17 |
| 142 | Twin Lakes Drilling Co. | 829 | — | 10 | 1997-02-10 |
| 143 | Mitchell Drilling Co. | 793 | — | 19 | 2000-05-23 |
| 144 | Townley Drilling | 755 | — | 13 | 2003-08-07 |
| 145 | Bernard Drilling Co. | 696 | — | 13 | 1975-08-07 |
| 146 | High Plains Drilling | 688 | — | 16 | 2008-12-18 |
| 147 | Layne Western Company Inc. | 659 | — | 31 | 2009-09-22 |
| 148 | Don Stewart & Son Drilling | 654 | — | 14 | 1994-02-28 |
| 149 | Five Star Inc. | 632 | — | 7 | 2001-07-10 |
| 150 | R & R Well & Pump Inc. | 630 | — | 6 | 2003-08-11 |
| 151 | Werner Drilling & Excavating | 625 | — | 16 | 1999-06-20 |
| 152 | L D Spencer Drilling & Pump | 624 | — | 10 | 2016-08-12 |
| 153 | Schmitt Drilling Co. | 621 | — | 11 | 1989-09-19 |
| 154 | Pro Well & Pump | 615 | — | 15 | 2018-07-27 |
| 155 | Hull Drilling | 601 | — | 15 | 2000-06-01 |
| 156 | Western Drilling Services, LLC | 600 | — | 17 | 2015-09-01 |
| 157 | Parrish Drilling | 570 | — | 18 | 2015-09-30 |
| 158 | Drilling Engineers Inc. | 553 | — | 21 | 2004-09-30 |
| 159 | Bernard Storm | 536 | — | 19 | 1997-10-17 |
| 160 | Routt Drilling Co. | 524 | — | 9 | 2008-12-20 |
| 161 | K. L. Rutt Company | 520 | — | 11 | 1985-09-20 |
| 162 | Rocky Mountain Pump & Drilling | 508 | — | 7 | 1988-04-06 |
| 163 | Mark Reeves | 502 | — | 7 | 2004-08-28 |
| 164 | M & M Backhoe Service | 497 | — | 10 | 2002-10-17 |
| 165 | George Stewart | 488 | — | 15 | 2014-07-29 |
| 166 | Mountain Drilling Co. | 487 | — | 8 | 2000-03-25 |
| 167 | Oliver Well Works | 465 | — | 21 | 2015-10-29 |
| 168 | Kunau Drilling & Excavation | 465 | — | 12 | 1993-08-24 |
| 169 | Larry Burk Drilling | 464 | — | 8 | 2000-06-01 |
| 170 | Gayln F. Olsen | 462 | — | 6 | 2015-03-27 |
| 171 | Klassen Drilling | 461 | — | 5 | 1983-10-11 |
| 172 | Burgess Well Company Inc. | 456 | — | 7 | 2000-04-01 |
| 173 | Jim Feighny & Sons | 446 | — | 13 | 1985-09-11 |
| 174 | Ernest C Young | 445 | — | 6 | 1996-08-31 |
| 175 | M & G Drilling & Supply | 439 | — | 12 | 1974-04-09 |
| 176 | Dallas D. Werner | 437 | — | 33 | 2021-03-15 |
| 177 | H A Crandall | 436 | — | 18 | 2013-04-20 |
| 178 | Western American Drilling Inc. | 434 | — | 6 | 2019-08-23 |
| 179 | Adams Water Well Drilling | 433 | — | 7 | 2003-06-26 |
| 180 | Holland/Mcmullen Water Well Drilling | 427 | — | 7 | 2020-02-04 |
| 181 | D W Spencer | 417 | — | 13 | 2005-05-19 |
| 182 | Timber Line Drilling | 415 | — | 12 | 2016-08-18 |
| 183 | Genevieve L Dale | 414 | — | 10 | 1991-09-06 |
| 184 | Living Water Well & Pump Inc. | 414 | — | 6 | 1987-06-15 |
| 185 | Schott Bros. Drilling | 406 | — | 5 | 2018-12-18 |
| 186 | J & J Drilling Inc. | 401 | — | 8 | 1994-03-29 |
| 187 | O.k. Hamacher Well Works | 393 | — | 15 | 1982-02-01 |
| 188 | Bill Mccoy Enterprises | 385 | — | 7 | 1985-05-30 |
| 189 | Henkle Drillng & Supply Co.inc | 384 | — | 18 | 2008-07-30 |
| 190 | Wesley Runyon Drilling Co. | 378 | — | 8 | 1978-07-15 |
| 191 | Crabtree Well & Pump | 377 | — | 9 | 1995-09-16 |
| 192 | Haggard Drilling Inc. | 373 | — | 10 | 1992-09-24 |
| 193 | Moody Drilling | 368 | — | 16 | 2008-12-10 |
| 194 | Reeves Drilling Inc. | 354 | — | 5 | 2012-04-19 |
| 195 | Ark Valley Pump & Supply | 348 | — | 12 | 2015-12-18 |
| 196 | Weber Water Well Drilling & Pump Service LLC | 343 | — | 13 | 2021-12-01 |
| 197 | Rocky Mountain Drlg./Pump Svcs | 335 | — | 11 | 2000-08-20 |
| 198 | Eugene Wheeler | 334 | — | 10 | 1976-10-08 |
| 199 | Craig Drilling | 334 | — | 7 | 2010-01-13 |
| 200 | Visintainer Co. | 331 | — | 8 | 1991-11-17 |
| 201 | Mcaninch | 330 | — | 8 | 2005-06-07 |
| 202 | Hasz Energy & Development Co. | 329 | — | 21 | 2010-11-16 |
| 203 | Crandall Drlg. & Trenching Inc. | 325 | — | 14 | 1992-12-15 |
| 204 | Harry Young Drilling | 321 | — | 7 | 1981-02-28 |
| 205 | K. W. Anderson Drilling | 316 | — | 9 | 1989-01-04 |
| 206 | Charles Sargent Irrigation Co. Inc. | 296 | — | 15 | 2021-04-22 |
| 207 | Wiggins Irrigation & Agri Serv | 296 | — | 8 | 1982-12-18 |
| 208 | Timberline Drilling | 295 | — | 5 | 1977-12-31 |
| 209 | Fred Pearson Water Pump Svc. | 294 | — | 6 | 1969-07-11 |
| 210 | Crandall's Look-N-Good Drilling | 292 | — | 13 | 1995-01-08 |
| 211 | Finney & Son | 286 | — | 7 | 1989-12-31 |
| 212 | Robert A. Jackson | 284 | — | 7 | 2010-03-27 |
| 213 | Snyder Well Pump Service | 280 | — | 2 | 1991-08-30 |
| 214 | James E Leatherman | 278 | — | 12 | 1976-09-28 |
| 215 | Stoneman Drilling | 274 | — | 9 | 2006-01-26 |
| 216 | Mark A. Huffington | 272 | — | 13 | 1996-09-06 |
| 217 | Grande Pump Service & Ojo Sprgs Drlng & | 265 | — | 9 | 2013-10-29 |
| 218 | C R Koogle | 257 | — | 7 | 2004-05-25 |
| 219 | Grabe & Co. | 257 | — | 4 | 1978-07-30 |
| 220 | Gary Oberhansly | 257 | — | 5 | 1999-03-09 |
| 221 | Adams City Mfg. Co. | 254 | — | 10 | 1987-05-04 |
| 222 | Mineral Exploration Drilling | 246 | — | 8 | 2016-05-06 |
| 223 | Paine's Pump & Repair | 244 | — | 7 | 1994-09-15 |
| 224 | Biggs And Freel | 244 | — | 6 | 1993-11-08 |
| 225 | DL Drilling LLC | 237 | — | 12 | 2008-05-16 |
| 226 | Air West Drilling | 237 | — | 8 | 2004-08-15 |
| 227 | Bomareto Pump And Equipment Company LLC | 234 | — | 17 | 2007-04-29 |
| 228 | Smith Drilling | 234 | — | 9 | 1970-08-25 |
| 229 | Schocke Drilling | 233 | — | 10 | 1988-09-25 |
| 230 | Holgate Drilling Co. | 228 | — | 8 | 1981-06-05 |
| 231 | Smith Water Well Service | 228 | — | 5 | 1988-05-15 |
| 232 | Darrell L. Sorensen | 226 | — | 10 | 2006-05-09 |
| 233 | Rupp Drilling Co., Inc. | 226 | — | 10 | 1980-11-29 |
| 234 | A. E. Biggs & Son | 225 | — | 7 | 1973-12-06 |
| 235 | Gordon Smith And Company | 218 | — | 7 | 2018-10-30 |
| 236 | Wayne Cummins Well Works | 218 | — | 6 | 1975-04-09 |
| 237 | Fred Wratislaw | 217 | — | 8 | 1957-04-16 |
| 238 | Ralph's Welding | 217 | — | 2 | 1977-12-31 |
| 239 | Campbell Drilling | 213 | — | 7 | 2010-10-28 |
| 240 | Spradlin Drilling | 210 | — | 5 | 1996-07-01 |
| 241 | Aaron D. Twiss | 209 | — | 5 | 1978-06-06 |
| 242 | Aragon Drilling Co. | 205 | — | 12 | 1996-12-17 |
| 243 | A. E. Crandall & Sons | 205 | — | 8 | 1986-08-12 |
| 244 | Stolns & Son Drilling | 205 | — | 3 | 2007-11-07 |
| 245 | Repp's Inc. | 204 | — | 7 | 2010-09-16 |
| 246 | Brunkhardt Water Well Drilling | 199 | — | 6 | 1988-07-30 |
| 247 | Marshall Drilling | 197 | — | 7 | 1984-06-27 |
| 248 | Gritz Drilling And Supply | 197 | — | 5 | 1984-07-10 |
| 249 | Campbell's Drilling Inc. | 194 | — | 6 | 1997-04-17 |
| 250 | Strain Excavating | 194 | — | 11 | 1977-06-26 |
| 251 | Stewart Well Drilling Co. | 193 | — | 7 | 1995-04-30 |
| 252 | Timberline Aqua Tec | 191 | — | 18 | 2015-07-18 |
| 253 | Don W. Thompson Drillng & Pump | 191 | — | 7 | 1986-07-23 |
| 254 | Lang Equipment, LLC | 190 | — | 11 | 2008-10-02 |
| 255 | Hackworth Drilling Inc. | 188 | — | 12 | 1991-11-11 |
| 256 | MA-Bel Drilling | 187 | — | 8 | 1999-07-21 |
| 257 | Fred JR Hilt | 187 | — | 2 | 1973-10-30 |
| 258 | Norris Brothers | 183 | — | 7 | 1985-04-13 |
| 259 | Olin J Thompson | 183 | — | 12 | 1994-06-09 |
| 260 | Joe Coniff Elec. Co. | 179 | — | 8 | 1964-12-15 |
| 261 | Paul Fletcher Drilling Co. | 179 | — | 13 | 1986-08-24 |
| 262 | Harry D Christensen | 173 | — | 9 | 1964-09-14 |
| 263 | B & M Well Drillers Inc. | 173 | — | 10 | 2008-11-12 |
| 264 | Dalby Pump Service, LLC | 169 | — | 7 | 2004-01-23 |
| 265 | Randal W. Speaker | 168 | — | 4 | 2001-06-15 |
| 266 | Lorraine Pearson | 167 | — | 12 | 1987-03-27 |
| 267 | Meredith Drilling Co. | 164 | — | 9 | 1988-10-17 |
| 268 | Harold Adams Well Works | 156 | — | 7 | 1977-01-11 |
| 269 | Rule | 153 | — | 3 | 1983-10-10 |
| 270 | Foster Drilling | 150 | — | 7 | 2017-05-25 |
| 271 | Western Sprinklers Inc. | 148 | — | 10 | 2003-09-13 |
| 272 | Maxey Well Works | 146 | — | 10 | 2010-06-25 |
| 273 | Durango Pump Co. | 146 | — | 4 | 2006-01-19 |
| 274 | S. E. Camp Drilling | 144 | — | 8 | 1996-06-10 |
| 275 | Eddy Well Drilliing | 141 | — | 9 | 2004-12-31 |
| 276 | Gregory A Rife | 138 | — | 5 | 1987-08-15 |
| 277 | Mccluer & Son's Drilling Inc. | 137 | — | 14 | 1983-10-28 |
| 278 | Interstate Water Wells, Inc. | 135 | — | 8 | 2005-01-04 |
| 279 | Venrick Drilling | 134 | — | 4 | 1963-10-15 |
| 280 | Joe's Drilling Co. | 131 | — | 6 | 1989-03-15 |
| 281 | Domestic Water Consultants Inc. | 129 | — | 15 | 1983-09-02 |
| 282 | Carlyle's Well Drilling Serv. | 127 | — | 4 | 1964-08-02 |
| 283 | Wrape & Payne | 127 | — | 7 | 1971-05-19 |
| 284 | Laplata Machine Supply Inc. | 127 | — | 5 | 2012-03-13 |
| 285 | Spelts Well Drilling | 127 | — | 2 | 1981-09-21 |
| 286 | L. E. Lewis Drilling Co. | 123 | — | 12 | 2002-04-11 |
| 287 | Lawrence Drilling | 123 | — | 4 | 1994-10-22 |
| 288 | Irrigation & Cont. Spec. | 122 | — | 6 | 2000-02-10 |
| 289 | L & L Drilling | 122 | — | 6 | 2005-10-30 |
| 290 | Gale Martin | 120 | — | 4 | 1988-03-01 |
| 291 | Ormsbee Development Co. | 120 | — | 11 | 1988-05-28 |
| 292 | Tanton Bros. Drilling | 118 | — | 4 | 1988-06-13 |
| 293 | Harriman Drilling, Inc. | 118 | — | 3 | 2008-10-06 |
| 294 | Rudolph Pump & Equipment Co. | 116 | — | 4 | 1974-06-02 |
| 295 | Arvada Pump Co. Inc. | 116 | — | 6 | 1972-11-09 |
| 296 | Precision Drilling | 115 | — | 11 | 2008-11-12 |
| 297 | Double B. Drilling | 114 | — | 4 | 1982-03-15 |
| 298 | Colorado Water Well Pump Service & Supply Inc. | 113 | — | 16 | 2005-02-04 |
| 299 | Western Well Drilling Inc. | 113 | — | 14 | 1988-04-23 |
| 300 | Ancell Drilling Service | 112 | — | 5 | 1990-09-10 |
| 301 | Johnson Brothers | 112 | — | 7 | 2019-07-26 |
| 302 | Kilby's Water Well Service | 111 | — | 4 | 1987-10-25 |
| 303 | William D Glenn | 110 | — | 6 | 1962-03-02 |
| 304 | Ogden Drilling | 110 | — | 3 | 1982-10-20 |
| 305 | Zion Drilling Service | 109 | — | 3 | 1975-05-19 |
| 306 | Harry D. Folger & Son | 109 | — | 10 | 2013-02-14 |
| 307 | Chrisman Pump Service | 109 | — | 5 | 2008-02-14 |
| 308 | DA Smith Drilling Company | 108 | — | 16 | 2016-10-18 |
| 309 | Syracuse Drilling & Pump Co., Inc. | 107 | — | 12 | 2004-08-12 |
| 310 | Jake T Glaspie | 103 | — | 4 | 1979-06-02 |
| 311 | Rye Well Drilling Co. | 103 | — | 5 | 1993-09-24 |
| 312 | Ivan Spath | 102 | — | 4 | 1967-07-05 |
| 313 | Boone Service | 102 | — | 11 | 2012-08-10 |
| 314 | Marco Exploration | 102 | — | 6 | 1994-05-28 |
| 315 | Allison Drilling Co. Inc. | 99 | — | 11 | 2003-05-13 |
| 316 | Colorado Drilling Company | 98 | — | 6 | 1985-01-22 |
| 317 | C. W. Grimshaw Drilling Co. | 97 | — | 10 | 1966-09-30 |
| 318 | E F Holman | 97 | — | 9 | 2010-09-02 |
| 319 | Don Rasnic Well & Pump Service | 96 | — | 3 | 1995-04-18 |
| 320 | United States Geological Survey | 96 | — | 10 | 2006-12-27 |
| 321 | Clyde L Peeples | 95 | — | 4 | 1967-12-11 |
| 322 | Rasnic Well Service Inc. | 95 | — | 4 | 2012-08-24 |
| 323 | Gary L. Hamacher | 95 | — | 7 | 1984-10-18 |
| 324 | Kerr & Sons | 94 | — | 6 | 2008-08-08 |
| 325 | Western Star Drilling Co. | 94 | — | 14 | 1984-12-03 |
| 326 | Klein Drilling | 93 | — | 7 | 1984-07-28 |
| 327 | Russell R Smith | 92 | — | 3 | 1991-05-06 |
| 328 | Kenyon Drilling/Kenyon Motor | 90 | — | 5 | 1989-07-14 |
| 329 | Rex Wyatt Drilling Co. | 90 | — | 8 | 2007-06-18 |
| 330 | Downey & Jaramio Well Drlg. | 89 | — | 7 | 1984-06-11 |
| 331 | Great Plains Drilling | 88 | — | 5 | 2001-09-21 |
| 332 | HI-Country Drilling | 86 | — | 7 | 1982-10-22 |
| 333 | Layne Environmental | 86 | — | 10 | 2019-03-11 |
| 334 | Western Well & Pump Inc. | 85 | — | 13 | 2010-09-01 |
| 335 | Thompson Drilling Co. | 85 | — | 6 | 1982-04-10 |
| 336 | Glen Cole | 84 | — | 6 | 1974-03-07 |
| 337 | Smith Drilling C/O Gordon R. Smith | 83 | — | 12 | 1996-07-28 |
| 338 | J Dixon | 82 | — | 11 | 1980-06-27 |
| 339 | Evergreen Drilling | 82 | — | 5 | 1971-06-16 |
| 340 | Marc Haes | 80 | — | 8 | 2011-01-04 |
| 341 | Donald Purdue | 78 | — | 5 | 1974-05-24 |
| 342 | Clibon Drilling Co. | 77 | — | 7 | 1973-02-17 |
| 343 | Harrys Drilling | 77 | — | 3 | 2004-01-16 |
| 344 | Hogan's Well Service | 76 | — | 2 | 1996-04-10 |
| 345 | Frederick J Korf | 75 | — | 8 | 1987-05-23 |
| 346 | Country Well & Pump Co. | 75 | — | 8 | 1988-07-20 |
| 347 | Bert D Downey | 74 | — | 9 | 2004-09-18 |
| 348 | Speelman Drilling | 74 | — | 6 | 1978-06-28 |
| 349 | Goodson & Associates | 73 | — | 8 | 2000-01-26 |
| 350 | Vista Geoscience | 72 | — | 12 | 2017-05-11 |
| 351 | Paul David Huff | 71 | — | 9 | 1981-08-26 |
| 352 | Dorris Drilling Co. | 70 | — | 9 | 2003-06-02 |
| 353 | Blue Sky Drilling Inc. | 69 | — | 4 | 1996-08-14 |
| 354 | Minter Wilson Drilling Co. | 68 | — | 5 | 2010-10-28 |
| 355 | L E Bundy | 67 | — | 7 | 1957-09-18 |
| 356 | Newmyer Development Co. | 67 | — | 10 | 1999-08-23 |
| 357 | Camp Drilling Co. | 66 | — | 12 | 2007-01-09 |
| 358 | Baski Drilling Inc. | 65 | — | 10 | 1989-07-09 |
| 359 | Levkulich Drilling | 65 | — | 3 | 1981-07-23 |
| 360 | Howard C Bainbridge | 64 | — | 9 | 1967-05-11 |
| 361 | Sidney Lilly D. | 63 | — | 8 | 1969-09-01 |
| 362 | Brian Lake | 63 | — | 11 | 2010-09-04 |
| 363 | Denver Pump Company | 62 | — | 8 | 1970-08-10 |
| 364 | Milburn W Schoene | 62 | — | 8 | 1958-06-09 |
| 365 | M A Garner | 60 | — | 7 | 2003-04-03 |
| 366 | Ram Drilling Inc. | 60 | — | 13 | 1984-11-20 |
| 367 | Livingston & Wilson | 59 | — | 6 | 1970-12-09 |
| 368 | Prosonic Corporation | 59 | — | 6 | 2019-03-01 |
| 369 | Kenneth Roberts | 59 | — | 9 | 1987-01-30 |
| 370 | Alfred J Clements | 59 | — | 5 | 2015-01-26 |
| 371 | Western Clean UP Corp | 58 | — | 6 | 2020-05-16 |
| 372 | William L Eden | 58 | — | 4 | 1963-12-10 |
| 373 | William F Burks | 57 | — | 4 | 1996-08-09 |
| 374 | R. N. C. Drilling Co. | 56 | — | 9 | 1993-11-10 |
| 375 | Hilt Drilling Co. | 56 | — | 2 | 1971-06-14 |
| 376 | Zion Well Drilling & Service | 56 | — | 2 | 1981-06-12 |
| 377 | Traugott Drilling Co. | 55 | — | 9 | 1958-05-13 |
| 378 | Earl Beegles | 55 | — | 6 | 1984-11-02 |
| 379 | Rumberg Inc. | 54 | — | 7 | 1968-08-10 |
| 380 | Ray Smischny & Son Inc. | 53 | — | 6 | 1973-11-24 |
| 381 | H A Dewey | 53 | — | 5 | 1969-06-30 |
| 382 | Independent Drilling Co. | 52 | — | 5 | 1988-08-31 |
| 383 | A Dbl R Well Service | 52 | — | 9 | 2012-12-16 |
| 384 | Alcro Inc. | 52 | — | 4 | 1977-06-02 |
| 385 | Charles Fastebend | 52 | — | 2 | 1956-12-29 |
| 386 | Taylor Exploration Co. | 51 | — | 9 | 2018-07-03 |
| 387 | Thorp Drilling | 51 | — | 2 | 1954-07-21 |
| 388 | Crawford's Water Well Drilling | 51 | — | 5 | 1981-01-06 |
| 389 | J S Tarkenton | 51 | — | 5 | 1977-07-22 |
| 390 | Clover Petroleum Co. | 49 | — | 4 | 1967-10-06 |
| 391 | James P Tolson | 49 | — | 6 | 2007-08-13 |
| 392 | Slims Water Well Service | 49 | — | 4 | 1967-05-03 |
| 393 | Collins Construction | 48 | — | 7 | 2008-06-20 |
| 394 | Corbett W Mabes | 47 | — | 4 | 1979-08-17 |
| 395 | Rocky Mountain Drilling Co. | 47 | — | 5 | 1998-11-02 |
| 396 | Clibon Well Drilling Co. | 47 | — | 9 | 1980-08-04 |
| 397 | Johnson Well And Irrigation | 47 | — | 8 | 1981-06-01 |
| 398 | Dean's Well Service | 47 | — | 6 | 1989-12-14 |
| 399 | Hill Depriest | 46 | — | 6 | 1982-10-13 |
| 400 | Jonathon D Pinkerton | 46 | — | 6 | 1969-05-05 |
| 401 | Spencer Drilling | 46 | — | 4 | 1984-09-28 |
| 402 | H W Collins | 45 | — | 3 | 1955-05-26 |
| 403 | Crawford Well & Pump Works | 45 | — | 3 | 1956-08-09 |
| 404 | N & D Drilling | 45 | — | 2 | 1969-12-01 |
| 405 | Moore's Well Drilling | 45 | — | 6 | 1983-10-21 |
| 406 | Taylor Driling,Inc.& Mineral | 45 | — | 4 | 1988-07-28 |
| 407 | Richard Construction | 45 | — | 1 | 1989-08-13 |
| 408 | Ray L Smischny | 44 | — | 5 | 1974-10-31 |
| 409 | Stewart Brothers Drilling Co. | 44 | — | 2 | 1998-12-19 |
| 410 | Ed's Excavating OF Stmbt Spgs | 44 | — | 1 | 2012-12-28 |
| 411 | Joe Felton & Son Drilling | 43 | — | 9 | 2019-07-27 |
| 412 | Walter J Charfield | 43 | — | 2 | 1956-02-08 |
| 413 | Wayne Drilling Service | 43 | — | 6 | 1986-01-24 |
| 414 | Schmitt & Francis Drilling | 42 | — | 6 | 1971-11-26 |
| 415 | Ecodynamics | 42 | — | 8 | 2002-06-28 |
| 416 | Carl M Minister | 41 | — | 4 | 1977-02-15 |
| 417 | Elmer Johnson Well Works | 41 | — | 3 | 1970-09-19 |
| 418 | Aquafirst, LLC | 41 | — | 6 | 2008-07-25 |
| 419 | Herbert G Coy | 40 | — | 4 | 1955-08-27 |
| 420 | Edgar H Boone | 40 | — | 4 | 1956-06-10 |
| 421 | Victor E Mccrory | 40 | — | 5 | 1986-05-16 |
| 422 | Wells, Ray S | 40 | — | 3 | 1968-11-25 |
| 423 | Golden Drilling Inc. | 40 | — | 11 | 1980-09-09 |
| 424 | John Snyder | 39 | — | 5 | 1974-03-01 |
| 425 | A & H Drilling | 39 | — | 3 | 2000-08-30 |
| 426 | Norman Hill Drilling Co. | 39 | — | 14 | 1986-06-10 |
| 427 | King Drilling LLC | 39 | — | 6 | 2003-04-18 |
| 428 | Ellithorpe & Putman | 39 | — | 6 | 1976-10-15 |
| 429 | Peavler Drilling | 38 | — | 4 | 1974-07-17 |
| 430 | Mcmillan Well Works Inc. | 38 | — | 2 | 1977-08-31 |
| 431 | Harold Thurman | 38 | — | 5 | 1967-08-17 |
| 432 | Apple Drilling | 38 | — | 4 | 1988-08-24 |
| 433 | Story Drilling | 38 | — | 9 | 2002-10-04 |
| 434 | Roger Schocke | 38 | — | 6 | 1978-07-30 |
| 435 | Crandall Bros. | 37 | — | 8 | 1983-01-27 |
| 436 | Fulton Drilling Co. | 37 | — | 7 | 1992-05-25 |
| 437 | Gary M. Vallas | 37 | — | 7 | 1984-10-27 |
| 438 | Abco Drilling Inc. | 37 | — | 2 | 2000-09-20 |
| 439 | Livingston & Hunt | 37 | — | 5 | 2003-01-15 |
| 440 | Daniel E. Callahan | 37 | — | 3 | 2020-09-13 |
| 441 | W O Heinlein | 36 | — | 3 | 1984-07-12 |
| 442 | R Drilling | 36 | — | 2 | 2012-12-01 |
| 443 | Douglass Drilling | 36 | — | 4 | 1991-09-30 |
| 444 | Curtis Johnson Company | 35 | — | 5 | 1961-04-29 |
| 445 | Basin Well Service | 35 | — | 4 | 2009-01-02 |
| 446 | Empire Irrigation Drilling Co. | 35 | — | 2 | 1971-05-05 |
| 447 | Pennell Drilling | 35 | — | 8 | 2000-08-16 |
| 448 | Meyers LLC | 35 | — | 2 | 2015-04-27 |
| 449 | Naill Drilling | 35 | — | 4 | 2001-04-29 |
| 450 | Johnson | 34 | — | 4 | 1977-06-08 |
| 451 | Baca Drilling Co. | 34 | — | 4 | 1974-07-31 |
| 452 | Glenn E Yeater | 34 | — | 5 | 1970-02-12 |
| 453 | Ward Drilling Co. | 34 | — | 4 | 1972-12-09 |
| 454 | E R Goodrich | 34 | — | 6 | 2003-06-06 |
| 455 | W C Rains | 34 | — | 3 | 1974-09-20 |
| 456 | Atlas Drilling Company | 34 | — | 6 | 1984-12-05 |
| 457 | Jim Keaton Drilling Co. | 34 | — | 8 | 2005-08-30 |
| 458 | Glenn Getman | 33 | — | 3 | 1981-01-27 |
| 459 | Bear River Drilling | 33 | — | 3 | 1981-02-06 |
| 460 | Shaffers Crossing Drilling | 32 | — | 3 | 1969-11-26 |
| 461 | John Runyon | 32 | — | 3 | 1979-10-15 |
| 462 | Charles L Grabler | 32 | — | 3 | 1972-12-17 |
| 463 | Earl Crane | 31 | — | 3 | 1977-02-07 |
| 464 | L V Eiserman | 31 | — | 6 | 1978-08-17 |
| 465 | Howard H Bell | 31 | — | 8 | 2006-07-13 |
| 466 | Sayers | 31 | — | 2 | 1973-10-20 |
| 467 | L C Williamson | 31 | — | 4 | 1973-07-17 |
| 468 | Tom Hughes Drilling Inc. | 31 | — | 2 | 2002-06-17 |
| 469 | Mosher Drilling | 31 | — | 5 | 1962-10-07 |
| 470 | Harry Watson | 30 | — | 4 | 1965-03-10 |
| 471 | Ora W Platz | 30 | — | 3 | 1955-05-11 |
| 472 | Archie K Harney | 30 | — | 4 | 1975-02-21 |
| 473 | Berries Water Wells | 30 | — | 4 | 1979-10-25 |
| 474 | Plains Drilling Co. | 30 | — | 12 | 1976-11-17 |
| 475 | Orville Diss Enterprises | 30 | — | 5 | 2009-06-30 |
| 476 | Tyler Water Well Inc. | 29 | — | 9 | 2008-08-29 |
| 477 | High Country Drilling Co. | 29 | — | 3 | 1977-11-17 |
| 478 | Penrose Drilling Co. | 29 | — | 4 | 1997-10-15 |
| 479 | Johnson Well Drilling | 29 | — | 5 | 1972-05-10 |
| 480 | C M Robison | 29 | — | 2 | 1955-12-14 |
| 481 | J. A. Price & Co. | 29 | — | 4 | 1978-09-19 |
| 482 | Ralph A Crawford | 29 | — | 3 | 1972-11-21 |
| 483 | Twiss & Wilson | 29 | — | 4 | 1997-08-27 |
| 484 | Ryan Drilling & Dev. | 29 | — | 2 | 1971-12-31 |
| 485 | Kirk Drilling Co. | 28 | — | 3 | 1968-04-17 |
| 486 | Jerome M. Waler | 28 | — | 6 | 2002-07-06 |
| 487 | B & B Well Service | 28 | — | 3 | 1998-12-31 |
| 488 | Canon Drilling & Pump Svc. | 28 | — | 8 | 1985-09-30 |
| 489 | Albon R Wolaver | 27 | — | 2 | 1957-02-25 |
| 490 | LA Plata Machine And Supply | 27 | — | 5 | 1977-11-23 |
| 491 | Fritz Erickson Mining | 27 | — | 6 | 1980-06-26 |
| 492 | George E Martin | 26 | — | 4 | 1956-08-11 |
| 493 | Richey Construction | 26 | — | 2 | 1964-01-05 |
| 494 | Robinson Well Service | 26 | — | 6 | 2001-07-24 |
| 495 | Tom Metz | 26 | — | 2 | 1975-04-28 |
| 496 | Pikes Peak Drlg & Pump Corp. | 26 | — | 5 | 1992-01-28 |
| 497 | Norman Cline Well Drilling | 26 | — | 6 | 1965-07-16 |
| 498 | K & R Drilling | 26 | — | 5 | 1984-10-20 |
| 499 | Ken Thatcher | 26 | — | 7 | 2015-10-03 |
| 500 | John Large | 26 | — | 3 | 2002-04-23 |
| 501 | Steele Drilling Company | 26 | — | 4 | 1969-01-17 |
| 502 | H B Pixley | 25 | — | 3 | 1956-01-06 |
| 503 | Mayfield & Kirk | 25 | — | 3 | 1989-07-17 |
| 504 | Duwayne D Cornum | 25 | — | 2 | 1983-10-20 |
| 505 | T. J. Drilling Inc. | 25 | — | 7 | 1990-04-20 |
| 506 | AZ Drilling | 25 | — | 3 | 1983-01-15 |
| 507 | Tyra Well Drilling | 25 | — | 3 | 1987-03-30 |
| 508 | M & B Drilling & Const. Co. | 25 | — | 3 | 1983-06-30 |
| 509 | Circle M Drilling | 25 | — | 5 | 1985-05-31 |
| 510 | Rosco's Well Drilling | 25 | — | 3 | 1956-06-24 |
Best well drillers by county
County-level rankings — who actually drills where, by wells on record.
- Adams County (174)
- Alamosa County (75)
- Arapahoe County (154)
- Archuleta County (41)
- Baca County (60)
- Bent County (48)
- Boulder County (120)
- Broomfield County (38)
- Chaffee County (81)
- Cheyenne County (42)
- Clear Creek County (73)
- Conejos County (64)
- Costilla County (69)
- Crowley County (33)
- Custer County (60)
- Delta County (39)
- Denver County (99)
- Dolores County (27)
- Douglas County (151)
- Eagle County (77)
- El Paso County (158)
- Elbert County (96)
- Fremont County (93)
- Garfield County (91)
- Gilpin County (48)
- Grand County (95)
- Gunnison County (96)
- Hinsdale County (56)
- Huerfano County (58)
- Jackson County (44)
- Jefferson County (192)
- Kiowa County (38)
- Kit Carson County (60)
- La Plata County (76)
- Lake County (51)
- Larimer County (106)
- Las Animas County (72)
- Lincoln County (53)
- Logan County (61)
- Mesa County (63)
- Mineral County (43)
- Moffat County (57)
- Montezuma County (36)
- Montrose County (62)
- Morgan County (71)
- Otero County (56)
- Ouray County (31)
- Park County (157)
- Phillips County (36)
- Pitkin County (45)
- Prowers County (68)
- Pueblo County (113)
- Rio Blanco County (61)
- Rio Grande County (73)
- Routt County (86)
- Saguache County (107)
- San Juan County (18)
- San Miguel County (48)
- Sedgwick County (31)
- Summit County (83)
- Teller County (77)
- Washington County (59)
- Weld County (179)
- Yuma County (72)
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