Oregon Well Drillers Directory
Every company that appears as the driller of record in the Oregon Water Resources Department (OWRD) well-log database, ranked by the number of wells they have drilled. 607 Oregon drilling companies account for 210,776 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.
607drilling companies
97active since 2022
210,776wells on record
Companies with at least 25 wells on record. "Active" counts wells completed since 2022.
| # | Company | Wells | Since 2022 | Counties | Most recent |
|---|---|---|---|---|---|
| 1 | Clouser Drilling Inc. | 5,007 | 1,204 | 8 | 2026-08-07 |
| 2 | Glacier Drilling & Dewatering | 1,449 | 1,196 | 15 | 2026-07-14 |
| 3 | Aiken Well Drilling | 3,691 | 807 | 14 | 2026-07-28 |
| 4 | Mathers Drilling Co. | 2,741 | 729 | 6 | 2026-08-06 |
| 5 | Abbas Well Drilling Co. | 3,291 | 705 | 15 | 2026-08-04 |
| 6 | Skyles Drilling Inc. | 5,397 | 541 | 11 | 2026-08-03 |
| 7 | Applegate Well Drilling LLC | 1,885 | 472 | 6 | 2026-07-21 |
| 8 | Jones Well Drilling Co. Inc. | 2,721 | 455 | 24 | 2026-08-07 |
| 9 | Alpine Resources LLC | 655 | 448 | 10 | 2026-08-07 |
| 10 | Casey Jones Well Drilling | 5,361 | 436 | 21 | 2026-08-06 |
| 11 | Griffin Contract Dewatering LLC | 373 | 373 | 3 | 2026-07-31 |
| 12 | Mack Drilling Co. | 2,791 | 354 | 15 | 2026-08-07 |
| 13 | Nugent Drilling Co. | 2,552 | 320 | 8 | 2026-08-11 |
| 14 | Bandon Well & Pump Company | 1,263 | 287 | 4 | 2026-08-06 |
| 15 | Southern Oregon Water Wells | 1,922 | 258 | 13 | 2026-07-23 |
| 16 | Harris Drilling LLC | 268 | 254 | 2 | 2026-08-04 |
| 17 | Courtney Well Drilling, LLC | 248 | 247 | 9 | 2026-08-06 |
| 18 | Arrow Drilling | 1,522 | 233 | 12 | 2026-07-21 |
| 19 | Mountain View Well Drilling | 309 | 228 | 2 | 2026-08-07 |
| 20 | Mohr Well Drilling | 2,315 | 220 | 7 | 2026-07-21 |
| 21 | Zollman's Larry Burd Well Drilling LLC | 1,083 | 211 | 12 | 2024-04-04 |
| 22 | Blue Water Drilling Co. Inc. | 2,203 | 205 | 9 | 2026-07-07 |
| 23 | Corvallis Drilling Co. Inc. | 2,745 | 200 | 13 | 2026-07-28 |
| 24 | Hendrickson Well Drilling Inc. | 1,945 | 179 | 19 | 2026-07-21 |
| 25 | Elkhorn Drilling Inc. | 347 | 177 | 4 | 2026-06-30 |
| 26 | Mcmullen Well Drilling Corp | 191 | 176 | 6 | 2026-07-15 |
| 27 | Norm Sevey Well Drilling | 1,769 | 168 | 6 | 2026-07-20 |
| 28 | Westerberg Drilling | 1,937 | 164 | 13 | 2026-01-21 |
| 29 | Groundwater Protection Service LLC | 242 | 162 | 8 | 2026-07-22 |
| 30 | Earth & Water Works | 1,023 | 161 | 9 | 2026-07-16 |
| 31 | Youngberg Pump & Well Drilling | 920 | 160 | 8 | 2026-07-28 |
| 32 | West Coast Well Drilling LLC | 333 | 153 | 6 | 2026-07-09 |
| 33 | Search Drilling Inc. | 789 | 129 | 10 | 2026-07-17 |
| 34 | Lee Drilling | 268 | 114 | 11 | 2026-07-30 |
| 35 | Dickerson Well Drilling | 1,647 | 93 | 13 | 2026-07-29 |
| 36 | Water Well Developing & Surveys | 678 | 93 | 5 | 2026-08-07 |
| 37 | Down Right Drilling & Pump Inc. | 383 | 87 | 7 | 2026-08-03 |
| 38 | Suretap Springs LLC | 86 | 86 | 5 | 2026-07-23 |
| 39 | Ben's Well Drilling & Repair LLC | 110 | 78 | 2 | 2026-07-15 |
| 40 | Bill Fielder Well Drilling & Pump | 933 | 77 | 8 | 2026-07-24 |
| 41 | Olsen Well Drilling & Pump | 177 | 77 | 4 | 2026-05-27 |
| 42 | Barrington Well Drilling | 1,748 | 76 | 7 | 2026-05-07 |
| 43 | Tc1 Well & Water Specialists LLC | 1,362 | 76 | 2 | 2025-10-11 |
| 44 | Edge Well Drilling LLC | 76 | 76 | 5 | 2026-07-08 |
| 45 | All Seasons Well Drilling | 525 | 73 | 9 | 2026-06-21 |
| 46 | R Stadeli & Sons Well & Pump Inc. | 161 | 73 | 7 | 2026-07-09 |
| 47 | Bill Fielder Well Drilling | 80 | 70 | 6 | 2026-05-20 |
| 48 | Oregon Trail Well Service LLC | 146 | 69 | 8 | 2026-07-14 |
| 49 | Chancellor Drilling | 372 | 67 | 3 | 2023-11-17 |
| 50 | Rogue Valley Drilling | 439 | 65 | 3 | 2026-07-23 |
| 51 | Access H2o | 62 | 62 | 6 | 2025-09-29 |
| 52 | Fry Industries Inc. | 1,378 | 61 | 7 | 2024-07-11 |
| 53 | TW Well Services LLC | 61 | 61 | 2 | 2026-08-05 |
| 54 | Sippel Well Drilling Inc. | 2,102 | 59 | 14 | 2026-07-08 |
| 55 | Malcolm Drilling Co. Inc. | 945 | 59 | 7 | 2026-04-07 |
| 56 | Western Water Development | 984 | 58 | 19 | 2026-04-10 |
| 57 | Southern Oregon Well Drilling Inc. | 542 | 58 | 4 | 2024-05-03 |
| 58 | Schneider Water Services | 164 | 50 | 18 | 2026-04-24 |
| 59 | Pli Systems | 149 | 50 | 9 | 2026-07-30 |
| 60 | White Water Well Drilling | 888 | 48 | 10 | 2025-09-17 |
| 61 | Rotary Drilling Co. Dba Siskiyou Pump Service | 48 | 48 | 2 | 2025-05-06 |
| 62 | Charles Fry | 47 | 47 | 3 | 2026-07-17 |
| 63 | Younberg Pump & Well Drilling LLC | 46 | 46 | 4 | 2024-09-09 |
| 64 | Gribble Well Drilling | 3,178 | 44 | 5 | 2025-08-25 |
| 65 | D & D Well Drilling LLC | 168 | 38 | 4 | 2025-08-26 |
| 66 | Southern Oregon Well Drilling IN | 38 | 38 | 2 | 2026-07-02 |
| 67 | Land Owner | 1,454 | 37 | 36 | 2023-05-16 |
| 68 | Wright's Well Drilling | 36 | 36 | 2 | 2026-06-30 |
| 69 | Marciel Well Drilling & Pumps | 408 | 35 | 10 | 2026-06-08 |
| 70 | Ron Robinson Well Drilling | 646 | 32 | 9 | 2025-10-21 |
| 71 | Rotary Drilling Company | 38 | 32 | 3 | 2026-07-23 |
| 72 | A J Gaunt & Son | 562 | 30 | 9 | 2026-06-29 |
| 73 | Jeff Haboush Well Drilling | 406 | 30 | 8 | 2026-07-18 |
| 74 | M-K Waterwell Drilling Inc. | 100 | 30 | 4 | 2026-08-07 |
| 75 | Holt Services Inc. | 70 | 30 | 13 | 2026-05-28 |
| 76 | K Consulting | 88 | 29 | 11 | 2023-10-02 |
| 77 | Aqua Works Well Service | 27 | 27 | 5 | 2026-04-30 |
| 78 | Grossen's Well Drilling | 354 | 26 | 8 | 2026-04-14 |
| 79 | MK Waterwell Drilling Inc. | 27 | 26 | 3 | 2025-05-08 |
| 80 | Wrights Artesian | 413 | 24 | 5 | 2023-06-28 |
| 81 | Mcleran Well Drilling | 47 | 24 | 2 | 2024-03-20 |
| 82 | Page Bros. Well Drilling | 111 | 23 | 3 | 2022-12-15 |
| 83 | Western Drilling Co. | 997 | 22 | 11 | 2023-03-24 |
| 84 | Chancellor Drilling & Pump | 223 | 21 | 4 | 2026-06-12 |
| 85 | Dig Well Drilling LLC | 64 | 21 | 5 | 2026-05-04 |
| 86 | Valentine Drilling | 151 | 18 | 3 | 2026-01-27 |
| 87 | Harding Drilling Co. | 325 | 14 | 1 | 2026-05-09 |
| 88 | Cascade Drilling LP | 325 | 12 | 21 | 2025-07-09 |
| 89 | Riverside Inc. | 214 | 12 | 8 | 2026-05-20 |
| 90 | NU Acre Drilling LLC | 166 | 10 | 3 | 2023-01-07 |
| 91 | Adamson Pump & Drilling Inc. | 198 | 8 | 2 | 2025-11-18 |
| 92 | Mcmullen Drilling Corp. | 1,329 | 7 | 9 | 2022-02-03 |
| 93 | M & M Well Drilling | 297 | 7 | 13 | 2022-06-02 |
| 94 | Tibbets Well Drilling | 136 | 7 | 5 | 2025-10-07 |
| 95 | Rick Wallaert Well Drilling | 109 | 6 | 4 | 2024-09-18 |
| 96 | Carpenter Drilling | 107 | 6 | 11 | 2026-07-13 |
| 97 | Treasure Valley Drilling, Inc. | 34 | 6 | 2 | 2026-02-06 |
| 98 | Robert D Miller Consulting | 92 | 4 | 8 | 2022-03-15 |
| 99 | Gregory Drilling Inc. | 41 | 4 | 4 | 2025-10-08 |
| 100 | Prepared BY Owrd Staff | 1,283 | 3 | 33 | 2023-10-12 |
| 101 | Stettler Supply Co. | 168 | 3 | 14 | 2023-12-06 |
| 102 | Vanmeter & Despain Well Drilling | 188 | 2 | 2 | 2022-06-16 |
| 103 | Stratus Corp | 108 | 2 | 11 | 2022-04-27 |
| 104 | LA Porte Construction & Drilling | 26 | 2 | 1 | 2026-04-15 |
| 105 | Owrd Staff | 597 | 1 | 28 | 2024-09-30 |
| 106 | Jensen Drilling Co. | 408 | 1 | 15 | 2023-10-25 |
| 107 | Dale Mcghee & Sons Well Drilling | 228 | 1 | 4 | 2022-03-10 |
| 108 | Williams Drilling Co. | 73 | 1 | 6 | 2022-01-14 |
| 109 | Compiled BY Owrd Staff | 45 | 1 | 8 | 2022-04-20 |
| 110 | Crater Well Drilling Inc. | 3,078 | — | 4 | 1984-12-09 |
| 111 | Martinson Well Drilling | 3,040 | — | 2 | 1987-01-20 |
| 112 | Willamette Drilling Co. | 3,018 | — | 10 | 2004-05-05 |
| 113 | Well ID Application | 2,794 | — | 35 | 2013-08-20 |
| 114 | A M Jannsen Drilling | 2,026 | — | 17 | 2005-12-17 |
| 115 | Mid Valley Drilling, Inc. | 1,925 | — | 8 | 2019-10-07 |
| 116 | R Stadeli & Sons Inc. | 1,766 | — | 7 | 2001-11-26 |
| 117 | A M Jannsen Well Drilling Co. Inc. | 1,744 | — | 21 | 2020-05-05 |
| 118 | Stoffel Bros Drilling Co. | 1,671 | — | 5 | 2015-03-25 |
| 119 | Quinns Well Drilling Inc. | 1,666 | — | 4 | 2012-05-09 |
| 120 | Medina Well Drilling | 1,476 | — | 4 | 2017-03-09 |
| 121 | Larry Burd Well Drilling | 1,344 | — | 13 | 2009-04-17 |
| 122 | Steve Kaser | 1,241 | — | 16 | 2020-01-30 |
| 123 | Skyles Drilling & Supply | 1,222 | — | 8 | 1992-06-06 |
| 124 | Steinman Brothers | 1,193 | — | 7 | 1992-01-31 |
| 125 | Mike's Well Drilling | 1,167 | — | 4 | 1996-02-29 |
| 126 | Christensen Well Drilling Co. | 1,129 | — | 10 | 2014-06-28 |
| 127 | Clearwater Well Drilling | 1,126 | — | 3 | 2017-08-16 |
| 128 | Pioneer Drilling | 1,108 | — | 4 | 2012-07-03 |
| 129 | Maphet Well Drilling And Pump | 1,104 | — | 9 | 2019-12-05 |
| 130 | J A Sneed & Sons | 1,087 | — | 5 | 1977-04-28 |
| 131 | Ashland Drilling | 1,085 | — | 5 | 2012-02-03 |
| 132 | Steinman Brothers Drilling Co. | 1,061 | — | 8 | 2013-11-20 |
| 133 | Wilcox Drilling And Pump Inc. | 1,006 | — | 8 | 2019-11-26 |
| 134 | Wallace Drilling | 1,004 | — | 9 | 2016-01-16 |
| 135 | Ted Pulliam Well Drilling | 931 | — | 11 | 2017-11-08 |
| 136 | Pete Tolmasoff Well Drilling | 919 | — | 3 | 1988-07-18 |
| 137 | Johnson Well Drilling | 904 | — | 8 | 2006-08-20 |
| 138 | Larry Evey Well Drilling | 873 | — | 9 | 2018-01-08 |
| 139 | Page Brothers Drilling | 868 | — | 4 | 2006-05-19 |
| 140 | S & M Drilling & Supply Inc. | 866 | — | 12 | 1982-03-31 |
| 141 | Colemans Drilling | 861 | — | 6 | 2018-10-23 |
| 142 | Paquin Drilling Co. | 807 | — | 4 | 1986-09-16 |
| 143 | Gray Well Drilling Inc. | 795 | — | 6 | 2013-09-20 |
| 144 | Becks Well Drilling | 774 | — | 4 | 1982-05-18 |
| 145 | Ground Water Systems Inc. | 753 | — | 7 | 1979-07-02 |
| 146 | Archie Fox Well Drilling | 721 | — | 7 | 2002-09-05 |
| 147 | Artesian Well Drilling | 697 | — | 7 | 2004-02-13 |
| 148 | Jones Drilling Co. Inc. | 678 | — | 13 | 2007-02-20 |
| 149 | Ira Trussell Well Drilling | 667 | — | 7 | 1986-06-14 |
| 150 | O. C. Tandy | 656 | — | 3 | 1981-06-08 |
| 151 | Ralph Turner Drilling Co. | 647 | — | 10 | 1980-03-24 |
| 152 | Holloway Drilling Co. | 632 | — | 5 | 1979-09-27 |
| 153 | K F Paquin & Son | 626 | — | 3 | 1980-07-14 |
| 154 | Palmers Well Drilling | 621 | — | 2 | 2001-06-01 |
| 155 | Keller Well Drilling Co. | 603 | — | 6 | 1995-09-15 |
| 156 | Palmer Well Drilling | 597 | — | 2 | 1996-04-19 |
| 157 | Ross A Jannsen Well Drilling | 590 | — | 4 | 1979-07-26 |
| 158 | Valley View Drilling | 589 | — | 8 | 2014-06-01 |
| 159 | Coleman's Well Drilling | 563 | — | 4 | 1995-08-08 |
| 160 | Troy Griffin Well Drilling | 562 | — | 6 | 1982-12-29 |
| 161 | Youngberg Drilling | 545 | — | 5 | 2006-06-04 |
| 162 | American Well Drilling Inc. | 532 | — | 15 | 2003-08-12 |
| 163 | Tualatin Valley Drilling Co. | 524 | — | 9 | 1986-05-14 |
| 164 | Friesen Drilling Co. Inc. | 514 | — | 2 | 1983-03-29 |
| 165 | Fred Robertson Well Drilling | 497 | — | 3 | 1974-07-26 |
| 166 | Monders Drilling Inc. | 491 | — | 5 | 2004-12-16 |
| 167 | Miller & West | 486 | — | 5 | 1979-10-25 |
| 168 | Merle Warren Well Drilling | 484 | — | 5 | 2006-09-06 |
| 169 | Tci Well Drilling | 483 | — | 4 | 2015-10-05 |
| 170 | West Coast Drilling | 474 | — | 15 | 2019-05-16 |
| 171 | M & H Well Drilling | 472 | — | 9 | 2008-08-22 |
| 172 | Bud Trussell Well Drilling | 472 | — | 6 | 1987-09-21 |
| 173 | Brad Williams Drilling | 471 | — | 11 | 2019-10-31 |
| 174 | Schneider Equipment Co. | 470 | — | 22 | 2012-09-26 |
| 175 | Eds Water Well Drilling | 457 | — | 3 | 1990-09-25 |
| 176 | Deceased 11-15-1990/Orvail Buckner Well Drilling I | 447 | — | 8 | 1992-06-19 |
| 177 | Turner Well Drilling | 436 | — | 8 | 2013-08-13 |
| 178 | Beck Well Drilling | 427 | — | 7 | 2017-08-23 |
| 179 | Artesian Drilling | 426 | — | 2 | 2006-11-07 |
| 180 | Miller-Robinson & West | 424 | — | 7 | 1973-11-09 |
| 181 | R J Strasser Drilling Co. | 410 | — | 17 | 1985-05-16 |
| 182 | Schoen Electric & Pump | 405 | — | 9 | 1979-11-26 |
| 183 | Dick Akins Well Drilling | 398 | — | 13 | 1975-09-30 |
| 184 | Larry K Crawford | 396 | — | 10 | 2018-03-30 |
| 185 | Geo-Tech Explorations | 384 | — | 23 | 2007-01-17 |
| 186 | Don Feakin | 384 | — | 7 | 2005-10-12 |
| 187 | Ridders Well Drilling | 380 | — | 6 | 2006-05-09 |
| 188 | Hansen Drilling Co. Inc. | 378 | — | 15 | 2018-04-26 |
| 189 | Tacoma Pump & Drilling Co. Inc. | 377 | — | 5 | 2020-11-17 |
| 190 | Duffield Brothers | 374 | — | 2 | 1973-06-07 |
| 191 | M-K Drilling Co. | 370 | — | 5 | 2017-05-24 |
| 192 | Roger Chancellor Well Drilling | 368 | — | 4 | 2005-05-17 |
| 193 | Dallas Drilling & Pump Co. | 367 | — | 4 | 2019-08-05 |
| 194 | Bandon Well & Septic Company Inc. | 365 | — | 4 | 2005-05-18 |
| 195 | Reed's Well Drilling | 361 | — | 4 | 1984-02-03 |
| 196 | Universal Geo-Tech Drilling Inc. | 356 | — | 2 | 1984-11-20 |
| 197 | Gerald D Olson | 350 | — | 5 | 2008-07-08 |
| 198 | Robinson Eola Drilling | 346 | — | 7 | 1976-12-22 |
| 199 | Eola Well Drilling | 341 | — | 9 | 1982-12-27 |
| 200 | Studebaker Brothers | 340 | — | 9 | 1979-11-26 |
| 201 | Oxley Well Drilling | 338 | — | 2 | 2006-06-17 |
| 202 | Sevey Well Drilling | 330 | — | 10 | 2001-04-10 |
| 203 | Steven J Coley | 328 | — | 3 | 2017-04-28 |
| 204 | Witham Water Wells | 328 | — | 3 | 2008-08-21 |
| 205 | Staco Well Services | 324 | — | 12 | 2002-10-08 |
| 206 | Turner Drilling Co. Inc. | 322 | — | 9 | 1997-10-10 |
| 207 | Todd's Drilling Service | 319 | — | 9 | 1977-06-01 |
| 208 | Haakon Bottner Drilling Co. | 317 | — | 7 | 1984-06-06 |
| 209 | Maphet Well Drilling | 317 | — | 5 | 1996-02-19 |
| 210 | Cummings Well Drilling | 316 | — | 9 | 2003-09-30 |
| 211 | Ray Borchers Well Drilling | 315 | — | 4 | 1983-10-10 |
| 212 | Dallas Delap Well Drilling | 315 | — | 3 | 1968-10-25 |
| 213 | G L Meyer Well Drilling | 312 | — | 3 | 2005-06-03 |
| 214 | Willow Creek Irrigation | 304 | — | 1 | 2009-09-08 |
| 215 | Coquille Well Drilling, Inc. | 298 | — | 4 | 2010-10-08 |
| 216 | Steiber's Well Drilling | 293 | — | 3 | 1967-12-11 |
| 217 | Bello Well Drilling | 292 | — | 9 | 2004-07-30 |
| 218 | Monders Inc. | 287 | — | 2 | 2019-03-12 |
| 219 | Miller & West Drilling | 283 | — | 4 | 1980-03-31 |
| 220 | B & G Drilling | 282 | — | 7 | 1987-05-01 |
| 221 | Jobe Drilling Inc. | 281 | — | 6 | 1990-03-31 |
| 222 | Applegate Water Well Drilling | 277 | — | 4 | 2006-10-19 |
| 223 | Blue MT Well Drilling | 270 | — | 8 | 1986-04-01 |
| 224 | Long Drilling | 269 | — | 3 | 1978-12-27 |
| 225 | Meyer Well Drilling | 266 | — | 3 | 2015-11-06 |
| 226 | Allison Drilling Co. | 266 | — | 4 | 1981-06-04 |
| 227 | Shults Bros Well Drilling | 266 | — | 2 | 1965-10-04 |
| 228 | J W Beck Well Drilling | 259 | — | 5 | 1983-04-15 |
| 229 | Pitcher Pump And Drilling | 248 | — | 8 | 2000-12-20 |
| 230 | Tolleson Drilling Co. | 248 | — | 2 | 1971-11-15 |
| 231 | Neal Gordon Davidson | 247 | — | 3 | 1986-03-19 |
| 232 | John Studebaker | 242 | — | 3 | 2002-05-19 |
| 233 | Charles Hartley Well Drilling | 241 | — | 2 | 1990-04-25 |
| 234 | Lanz Well Drilling | 239 | — | 2 | 1979-08-11 |
| 235 | Dale Crawford Well Drilling Consultant | 238 | — | 4 | 1977-10-20 |
| 236 | Mcclanahan Well Drilling | 237 | — | 4 | 1982-06-24 |
| 237 | All Ways Drilling | 232 | — | 4 | 2007-12-01 |
| 238 | Beier & Waldroop Well Services Inc. | 231 | — | 9 | 2009-10-11 |
| 239 | W W Drilling & Pump | 228 | — | 3 | 1979-12-13 |
| 240 | Austin Well Drilling | 225 | — | 5 | 2012-07-30 |
| 241 | C H Witcher Well Drilling | 216 | — | 2 | 1973-03-12 |
| 242 | Howlett's Well DR | 215 | — | 3 | 1980-12-15 |
| 243 | Jack Barron Well Drilling | 214 | — | 3 | 1978-08-28 |
| 244 | Bob Mccoy | 214 | — | 3 | 1995-04-05 |
| 245 | Claude Blackman Drilling | 213 | — | 2 | 2019-05-26 |
| 246 | Richard Brogdon | 213 | — | 2 | 2008-08-06 |
| 247 | B & A Drilling Co. | 212 | — | 4 | 1988-07-23 |
| 248 | Hayes & Page Well Drilling | 207 | — | 2 | 1974-09-17 |
| 249 | E M J Behrens | 204 | — | 1 | 1976-03-25 |
| 250 | Olsen Well Drilling Inc. | 203 | — | 2 | 1983-08-19 |
| 251 | Crawford Well Drilling | 203 | — | 9 | 1988-08-31 |
| 252 | Lucore Drilling Co. | 202 | — | 3 | 2005-12-20 |
| 253 | Calvin C Bram Well Drilling | 200 | — | 3 | 1983-08-18 |
| 254 | Bill Miller Well Drilling | 200 | — | 2 | 1986-03-17 |
| 255 | Storey Well Drilling | 198 | — | 3 | 1975-10-20 |
| 256 | D V Wyland & Co. Inc. | 197 | — | 3 | 1984-02-03 |
| 257 | Mcinally Well Drilling | 196 | — | 3 | 2009-09-30 |
| 258 | Carters Drilling & Pump Servic | 194 | — | 4 | 1998-02-20 |
| 259 | Jackson Drilling Co. | 193 | — | 4 | 1971-04-10 |
| 260 | L W Mutschler Well Drilling | 191 | — | 12 | 1982-05-10 |
| 261 | Merwin 'bud' Mcmullen | 187 | — | 4 | 1999-12-02 |
| 262 | Dell Page Well Drilling Inc. | 186 | — | 3 | 1994-04-22 |
| 263 | Water Well Developing Surveys | 183 | — | 3 | 2006-12-28 |
| 264 | Carters Drilling & Pump Service Inc. | 182 | — | 5 | 1992-02-18 |
| 265 | Brandt Drilling Co. | 179 | — | 13 | 1994-07-28 |
| 266 | Paysinger Corp-Blue Water | 179 | — | 4 | 1998-05-04 |
| 267 | Joneses Drilling Co. Inc. | 177 | — | 6 | 1980-09-27 |
| 268 | Gale Brockett | 176 | — | 3 | 2006-11-08 |
| 269 | Triple A Drilling | 176 | — | 2 | 2017-02-28 |
| 270 | Jerry Madsen Well Drilling | 172 | — | 3 | 2014-04-09 |
| 271 | Schneider Drilling | 172 | — | 3 | 1986-03-07 |
| 272 | Robinson Well Drilling | 170 | — | 9 | 2006-11-02 |
| 273 | A & P Pump Service LLC | 169 | — | 8 | 2018-02-14 |
| 274 | Bandon Well & Septic Company I | 169 | — | 3 | 2000-06-02 |
| 275 | Miller Jensen Co. | 165 | — | 2 | 1978-05-12 |
| 276 | Northwest Drilling | 164 | — | 6 | 1994-05-26 |
| 277 | Skinner & Sons | 164 | — | 5 | 1976-07-31 |
| 278 | Bonnie Brae Drilling Co. | 163 | — | 1 | 1966-02-25 |
| 279 | Swift Water Well Drilling Inc. | 156 | — | 9 | 1980-01-25 |
| 280 | Ladd Horn Well Drilling | 154 | — | 7 | 1982-10-07 |
| 281 | Brant Well Drilling | 153 | — | 2 | 2008-07-19 |
| 282 | Milo Schneider Equipment Co. | 153 | — | 4 | 1975-09-25 |
| 283 | Zander Drilling Co. | 153 | — | 5 | 1998-10-07 |
| 284 | Bebout Pump Company | 153 | — | 2 | 2007-09-30 |
| 285 | Barron & Strayer | 152 | — | 12 | 1973-08-23 |
| 286 | Flores Well Drilling | 152 | — | 8 | 1984-12-16 |
| 287 | Glen White Well Drilling | 150 | — | 7 | 2010-06-30 |
| 288 | Murray Well Drilling | 150 | — | 8 | 2002-01-30 |
| 289 | Bill Fields Well Drilling & Pump | 147 | — | 4 | 2003-05-06 |
| 290 | H & H Construction Co. | 147 | — | 4 | 1979-08-13 |
| 291 | Orvail Buckner Well Drilling | 146 | — | 14 | 1988-06-10 |
| 292 | Strata Drilling LLC | 146 | — | 3 | 2013-06-23 |
| 293 | Holocene Drilling Inc. | 146 | — | 1 | 2020-09-11 |
| 294 | Dennis Drilling Enterprises, Inc. | 145 | — | 3 | 2011-05-11 |
| 295 | Mel Search Well Drilling | 143 | — | 7 | 2000-01-31 |
| 296 | Dry Gulch Drilling | 142 | — | 6 | 2007-08-27 |
| 297 | Art Mcmullen Drilling Corporation | 141 | — | 5 | 2010-04-27 |
| 298 | Rods Well Drilling | 141 | — | 6 | 1981-10-19 |
| 299 | Dan Merrill Drilling | 136 | — | 5 | 2004-07-28 |
| 300 | A. W. Robinson | 135 | — | 2 | 1978-01-03 |
| 301 | West Well Drilling | 135 | — | 3 | 1964-09-22 |
| 302 | Western Well Drilling | 134 | — | 4 | 2001-10-08 |
| 303 | Devlaeminck Well Drilling | 132 | — | 5 | 2006-06-13 |
| 304 | H & H Drilling | 131 | — | 7 | 1986-10-03 |
| 305 | M-H Well Drilling Inc. | 129 | — | 8 | 1981-07-23 |
| 306 | Dale Mcghee Well Drilling | 128 | — | 3 | 1978-10-25 |
| 307 | Maynard Drilling And Pumps Inc. | 126 | — | 2 | 2000-11-22 |
| 308 | Robinsons Eola Well Drilling | 126 | — | 4 | 1976-11-10 |
| 309 | Larry A Gray | 126 | — | 1 | 2005-10-11 |
| 310 | Cullett Bros Well Drilling | 124 | — | 3 | 1978-04-22 |
| 311 | Clauson Well Drilling | 123 | — | 4 | 1988-06-24 |
| 312 | T & M Drilling Services | 123 | — | 1 | 1975-01-06 |
| 313 | Kelsey Dennis | 121 | — | 1 | 1989-05-19 |
| 314 | K. Dennis | 120 | — | 3 | 1988-12-16 |
| 315 | John Skiles | 120 | — | 2 | 1999-08-05 |
| 316 | Hysell Pump & Drilling | 119 | — | 3 | 1982-06-14 |
| 317 | E.e. Storey & Son Well Drilling, Inc. | 119 | — | 4 | 1985-01-15 |
| 318 | Brookings Well Drilling | 119 | — | 1 | 1972-04-16 |
| 319 | Robinson Drilling Wells&pumps | 118 | — | 6 | 1997-07-07 |
| 320 | Donald W. Read | 118 | — | 6 | 2007-03-09 |
| 321 | May Well Drilling | 117 | — | 6 | 1992-09-04 |
| 322 | Donnelly Drilling Co. | 117 | — | 3 | 1987-08-14 |
| 323 | Estacada Well Drilling | 117 | — | 3 | 1993-06-23 |
| 324 | Eds Water Well Drilling & Sons | 117 | — | 4 | 1999-01-05 |
| 325 | Storey Drilling Services | 117 | — | 2 | 2007-05-21 |
| 326 | Madsen's Well Drilling | 117 | — | 1 | 1999-05-04 |
| 327 | Anthony Well Drilling | 116 | — | 5 | 1999-05-03 |
| 328 | Miller West Well Drilling | 116 | — | 6 | 1983-08-25 |
| 329 | Schrunks Drilling Service | 116 | — | 4 | 1989-08-24 |
| 330 | Frank Wilson Drilling | 116 | — | 2 | 2000-08-18 |
| 331 | Byrd Drilling Co. | 114 | — | 3 | 2010-09-10 |
| 332 | Arrow Drilling & Supplies | 114 | — | 6 | 1976-07-14 |
| 333 | Wilson Drilling Contract | 114 | — | 2 | 2008-12-15 |
| 334 | Rudd W Davis Well Drilling | 113 | — | 4 | 1972-01-08 |
| 335 | Fox Well Drilling | 113 | — | 8 | 2002-03-29 |
| 336 | Boehrs And Walton | 113 | — | 3 | 1964-05-08 |
| 337 | Oren Storey Well Drilling | 113 | — | 1 | 1981-12-28 |
| 338 | Evergreen Well Drilling | 112 | — | 5 | 2009-11-28 |
| 339 | John Hershey Well Drilling | 112 | — | 3 | 1972-02-04 |
| 340 | R F Sneed Well Drilling | 111 | — | 2 | 1985-08-24 |
| 341 | Water Rite Well Drilling | 110 | — | 3 | 2004-10-19 |
| 342 | Art Clinton Well Drilling Co. | 109 | — | 7 | 1975-10-14 |
| 343 | J F Terrell Well Drilling | 108 | — | 4 | 1971-12-07 |
| 344 | Brogdon's Drilling Co. | 106 | — | 3 | 2009-03-10 |
| 345 | Bryant Well Drilling | 104 | — | 6 | 2001-03-15 |
| 346 | Hurst Well Drilling Co. | 103 | — | 3 | 1969-09-01 |
| 347 | Wallace Well Drilling | 101 | — | 4 | 1980-02-21 |
| 348 | Mike Waldroop Well Drilling | 101 | — | 8 | 1997-04-04 |
| 349 | Stadeli Drilling Co. | 101 | — | 5 | 1977-09-08 |
| 350 | J & J Water Well Drilling | 101 | — | 2 | 1983-01-04 |
| 351 | Bannons Well Tech | 100 | — | 4 | 1997-10-02 |
| 352 | D-3 Well Drilling | 100 | — | 4 | 2000-01-07 |
| 353 | Browners Well Drilling | 98 | — | 2 | 1967-05-03 |
| 354 | Robinson Eola Well Drilling | 98 | — | 5 | 1976-08-01 |
| 355 | Denny Mcclane Well Drilling | 97 | — | 1 | 1977-03-18 |
| 356 | Paquin Well Drilling | 96 | — | 4 | 1985-08-21 |
| 357 | Bobs Well Drilling Inc. | 95 | — | 7 | 1984-09-12 |
| 358 | Dale Mcgee & Sons Well Drilling | 95 | — | 2 | 2005-09-14 |
| 359 | Studebaker Drilling Inc. | 94 | — | 3 | 1992-12-16 |
| 360 | J & W Neal Company | 93 | — | 3 | 2005-08-08 |
| 361 | John Meeker Well Drilling | 93 | — | 6 | 1977-11-02 |
| 362 | Alpha Drilling | 92 | — | 4 | 2020-04-13 |
| 363 | Oetter Drilling Co. | 92 | — | 3 | 2019-10-30 |
| 364 | Vanmeter & Despain Well Drilli | 92 | — | 2 | 2000-05-31 |
| 365 | Bob Scheler Well Drilling | 91 | — | 4 | 1986-05-03 |
| 366 | Brockett Drilling | 91 | — | 5 | 2006-10-01 |
| 367 | High Country Pump | 90 | — | 2 | 1994-01-05 |
| 368 | Holt Drilling Inc. | 90 | — | 2 | 2006-06-23 |
| 369 | Stites Well Drilling | 89 | — | 8 | 2007-07-06 |
| 370 | Schoen Electric Inc. | 88 | — | 8 | 1982-09-16 |
| 371 | Brown & Brown Drilling Co. | 88 | — | 5 | 1987-12-12 |
| 372 | Anthony Well Drilling & Pumps, Inc. | 87 | — | 4 | 2004-05-24 |
| 373 | South Coast Drilling | 87 | — | 2 | 2001-08-24 |
| 374 | Donald M Fox | 87 | — | 5 | 2006-10-23 |
| 375 | A O Olsen Well Drilling | 85 | — | 2 | 1981-06-19 |
| 376 | Gaarsland Drilling Co. | 85 | — | 3 | 1974-12-29 |
| 377 | Harry A Robinson Well Drilling | 84 | — | 5 | 1970-10-16 |
| 378 | Rodney C Erler | 84 | — | 14 | 2020-12-12 |
| 379 | Virgle Gribble Well Drilling | 84 | — | 2 | 1977-05-24 |
| 380 | Shand Brothers Drilling Co. | 84 | — | 1 | 1960-06-21 |
| 381 | Pat Page Well Drilling | 82 | — | 3 | 1999-06-30 |
| 382 | Andy M Jannsen Well Drilling | 82 | — | 2 | 1986-08-13 |
| 383 | Davis & Son Drilling | 82 | — | 3 | 2005-05-30 |
| 384 | Sneed Well Drilling Inc. | 82 | — | 4 | 1995-12-20 |
| 385 | Gellatly & Witham | 81 | — | 5 | 1990-09-27 |
| 386 | Mutschler Well Drilling | 81 | — | 6 | 1976-11-03 |
| 387 | Dale Mcghee & Sons Well Drilli | 81 | — | 1 | 2000-05-03 |
| 388 | C & R Drilling Co. | 81 | — | 6 | 1977-09-18 |
| 389 | Lee Well Drilling & Pump Servi | 80 | — | 4 | 2000-04-18 |
| 390 | W W Drilling | 79 | — | 2 | 1979-08-17 |
| 391 | Northwest Well Drilling | 78 | — | 8 | 1997-06-26 |
| 392 | Alpine Resourcs LLC | 78 | — | 7 | 2020-11-20 |
| 393 | James A Roberts Well Drilling | 78 | — | 1 | 1973-08-03 |
| 394 | Moore Well Drilling | 78 | — | 1 | 1980-10-06 |
| 395 | John Marciel | 76 | — | 2 | 1999-06-29 |
| 396 | Person Pump & Well Drilling | 76 | — | 8 | 2018-03-28 |
| 397 | Robinson Drilling & Supply | 75 | — | 3 | 1960-12-30 |
| 398 | Brad Williams Drilling/Deceased 5/2013 | 75 | — | 3 | 1996-09-19 |
| 399 | Exeter Water Well Drilling | 74 | — | 4 | 2001-02-14 |
| 400 | Wayne T Buckner | 74 | — | 1 | 1992-11-05 |
| 401 | D K Smith Well Drilling | 74 | — | 2 | 1977-07-18 |
| 402 | Kelsey D. Dennis | 73 | — | 2 | 2004-04-19 |
| 403 | Wymore Well Drillers | 73 | — | 3 | 1995-07-06 |
| 404 | O E Jannsen Drilling Co. | 72 | — | 2 | 1968-08-19 |
| 405 | John W Beck Well Drilling | 71 | — | 4 | 1979-06-30 |
| 406 | Pioneer Water Development Inc. | 70 | — | 2 | 1982-03-29 |
| 407 | Corriell & Sedgwick, Inc. | 70 | — | 3 | 1974-03-18 |
| 408 | Farrel Mcghee Well Drilling | 70 | — | 2 | 1977-05-05 |
| 409 | Paquin & Story | 70 | — | 3 | 1958-09-26 |
| 410 | Simons & Gregory | 69 | — | 3 | 1964-11-01 |
| 411 | Big Three Drilling & Pump Serv | 69 | — | 4 | 1999-05-15 |
| 412 | Davidson Drilling Inc. | 69 | — | 4 | 1987-08-15 |
| 413 | Baert Drilling | 69 | — | 3 | 1997-11-12 |
| 414 | Gary Mitch Raley | 68 | — | 7 | 2013-10-17 |
| 415 | Werner Drilling & Pump Service | 68 | — | 1 | 1976-01-01 |
| 416 | Clays Well Drilling | 67 | — | 3 | 2012-11-18 |
| 417 | Gilbert Clayton Well Drilling | 67 | — | 5 | 2007-09-30 |
| 418 | Rossberg & Son | 67 | — | 1 | 1990-04-28 |
| 419 | Buds Well Drilling | 66 | — | 7 | 1987-10-27 |
| 420 | Turner Water Well Drilling | 66 | — | 6 | 1998-06-24 |
| 421 | Williams Well Drilling | 66 | — | 2 | 1985-04-30 |
| 422 | Hay Creek Ranch | 66 | — | 3 | 1998-06-18 |
| 423 | Deceased/Aqua Drilling | 66 | — | 2 | 1991-11-25 |
| 424 | Bryant Well Drilling & Pump | 66 | — | 3 | 2004-05-01 |
| 425 | Carl A Pitcher | 65 | — | 5 | 1995-11-13 |
| 426 | Durden Well Drilling | 65 | — | 3 | 1997-06-18 |
| 427 | Aqua-Tech Well Construction | 64 | — | 6 | 1982-01-22 |
| 428 | George Robinson Drilling | 64 | — | 5 | 1984-02-09 |
| 429 | Les Shanahan Well Drilling Co. | 64 | — | 4 | 1980-04-22 |
| 430 | J W Beck Welldrilling | 63 | — | 2 | 1981-01-09 |
| 431 | Bill Williams Well Drilling | 63 | — | 4 | 1982-02-03 |
| 432 | Bowman Drilling | 62 | — | 2 | 1999-05-15 |
| 433 | C W Summers Well Drilling | 61 | — | 3 | 1993-10-29 |
| 434 | Ross Jannsen Well Drilling | 60 | — | 2 | 1979-07-06 |
| 435 | Affordable Well Company | 60 | — | 4 | 2004-10-09 |
| 436 | Meeker Well Drilling | 59 | — | 6 | 1976-04-14 |
| 437 | Ted Schueler Well Drilling | 59 | — | 4 | 1998-04-27 |
| 438 | Trussell Well Drilling | 59 | — | 4 | 1985-07-31 |
| 439 | David Pinkley | 59 | — | 2 | 2002-06-12 |
| 440 | Vic Durden Well Drilling Inc. | 59 | — | 3 | 1997-04-11 |
| 441 | Macs Well Drilling | 58 | — | 1 | 1975-07-01 |
| 442 | Aqua Drilling | 58 | — | 2 | 1992-10-18 |
| 443 | W R Ille & Co. | 58 | — | 2 | 1963-02-15 |
| 444 | South State Drilling Co. | 57 | — | 4 | 1973-08-31 |
| 445 | Environmental West Exploration | 56 | — | 8 | 2008-09-03 |
| 446 | Merrill Drilling Inc. | 56 | — | 2 | 2012-03-28 |
| 447 | Cyril Vandehey | 56 | — | 4 | 2000-08-07 |
| 448 | Carter Well Drilling | 56 | — | 3 | 1997-08-29 |
| 449 | Henrickson Construction And WE | 56 | — | 3 | 1996-10-25 |
| 450 | F & S Well Drilling | 55 | — | 3 | 1973-02-27 |
| 451 | B & S Drilling Co. | 55 | — | 4 | 1970-03-26 |
| 452 | J & J Drilling Co. | 55 | — | 1 | 1983-05-06 |
| 453 | Lowell W. Marlatt | 55 | — | 2 | 1992-12-05 |
| 454 | Jwn Company Inc. | 54 | — | 5 | 2009-06-04 |
| 455 | Rnd Well Drilling | 54 | — | 1 | 1990-04-18 |
| 456 | Hartley Well Drilling | 54 | — | 1 | 1981-09-30 |
| 457 | Eastwood Water Well Drilling | 53 | — | 3 | 1970-07-25 |
| 458 | Williams Water Wells | 53 | — | 2 | 1993-01-22 |
| 459 | Staco AG Well Services LLC | 53 | — | 6 | 2012-06-01 |
| 460 | Deceased 10-2-06/Rogue Valley Drilling | 53 | — | 1 | 2004-03-19 |
| 461 | Blue Sky Well Drilling | 53 | — | 1 | 2012-01-15 |
| 462 | William Long Drilling | 53 | — | 2 | 1987-10-24 |
| 463 | Greenacres Hand Dug Wells | 52 | — | 2 | 1992-07-15 |
| 464 | Goff Bros | 52 | — | 2 | 1972-09-07 |
| 465 | R E Mctavish Well Drilling | 51 | — | 1 | 1961-06-23 |
| 466 | Materi Exploration | 51 | — | 1 | 1984-01-19 |
| 467 | O C Tandy Well Drilling | 50 | — | 4 | 1979-06-29 |
| 468 | Larry Burd | 50 | — | 6 | 1993-11-07 |
| 469 | Walter N White | 50 | — | 3 | 1997-10-16 |
| 470 | Capitol Well Drilling Inc. | 50 | — | 4 | 2016-04-15 |
| 471 | Ron Edgell Pump And Well Drilling | 50 | — | 1 | 1990-05-02 |
| 472 | Coleman Well Drilling | 50 | — | 3 | 1995-07-14 |
| 473 | Robinson Drilling | 50 | — | 4 | 1995-03-07 |
| 474 | Goral LA Porte | 50 | — | 2 | 2008-06-26 |
| 475 | Mcguire Drilling Co. | 49 | — | 3 | 1973-11-05 |
| 476 | H D Woodruff Drilling | 49 | — | 2 | 1986-08-12 |
| 477 | Bruce K Eberle | 49 | — | 1 | 2005-05-18 |
| 478 | Deceased 4-21-2010/Stoffel Bros Drilling Co. | 48 | — | 4 | 2010-04-26 |
| 479 | Deep Hole Drilling | 48 | — | 5 | 2020-01-31 |
| 480 | Borchers Drilling Inc. | 48 | — | 4 | 1984-01-26 |
| 481 | Luttrell Well Drilling | 48 | — | 4 | 1989-07-02 |
| 482 | Bill Williams Drilling | 48 | — | 1 | 1982-02-03 |
| 483 | Kenneth Smith SR | 48 | — | 2 | 2011-08-15 |
| 484 | Scheler Well Drilling | 47 | — | 3 | 1998-08-21 |
| 485 | Miller & West Well Drilling | 47 | — | 5 | 1983-12-15 |
| 486 | Water Boys Well Drilling | 46 | — | 5 | 1977-08-12 |
| 487 | Boart Longyear | 46 | — | 9 | 2009-04-17 |
| 488 | Akins Well Drilling | 46 | — | 3 | 1974-11-07 |
| 489 | Deceased 10-1997/Carter Well Drilling | 46 | — | 4 | 1995-04-25 |
| 490 | Arms & Schilling Well Drilling | 46 | — | 4 | 1990-10-10 |
| 491 | D V Wyland Co. | 45 | — | 3 | 1980-10-23 |
| 492 | Richardson Well Drilling | 43 | — | 3 | 1980-11-28 |
| 493 | Arms & Schilling | 43 | — | 3 | 1997-03-13 |
| 494 | Haines Water Well Drilling Service | 43 | — | 1 | 2018-11-15 |
| 495 | Ace Drilling Co. | 42 | — | 3 | 1964-02-28 |
| 496 | Guy A Luttrell Well Drilling | 42 | — | 2 | 1979-12-06 |
| 497 | Northwest Equipment & Drilling Co. | 42 | — | 1 | 1967-06-30 |
| 498 | Kulick Well Drilling | 42 | — | 5 | 1983-02-18 |
| 499 | MC Inally Well Drilling | 42 | — | 2 | 1987-06-07 |
| 500 | Barnett Drilling & Pumps | 41 | — | 2 | 1983-02-10 |
| 501 | Pacific Well Drilling | 41 | — | 7 | 1998-12-30 |
| 502 | Ed's Water Well Drilling & Son | 41 | — | 2 | 1996-10-01 |
| 503 | Yager Drilling Co. | 41 | — | 3 | 1967-07-26 |
| 504 | Hayden Drilling Co. | 41 | — | 1 | 1965-03-12 |
| 505 | Howell Well Drilling | 40 | — | 3 | 1976-07-26 |
| 506 | Melvin Search Well Drilling | 40 | — | 4 | 1977-10-16 |
| 507 | Western States Soil & Cons Inc. | 40 | — | 2 | 2010-05-13 |
| 508 | Kelsey D Dennis Drilling | 39 | — | 1 | 2004-10-04 |
| 509 | Boart Longyear E & I | 39 | — | 11 | 2013-08-25 |
| 510 | Terrence Jacques | 39 | — | 2 | 2013-05-19 |
| 511 | Troy Griffin | 39 | — | 3 | 1982-02-02 |
| 512 | N Klaus Drilling Co. | 38 | — | 3 | 1960-10-22 |
| 513 | Deceased/R. J. Strasser Drilling Co. | 38 | — | 10 | 1980-08-01 |
| 514 | Mike Smith Well Drilling | 38 | — | 1 | 2011-02-03 |
| 515 | Meyer Pump Service | 38 | — | 2 | 1990-08-28 |
| 516 | Scott Martin Drilling | 38 | — | 2 | 1999-08-05 |
| 517 | D D Dickinson | 38 | — | 1 | 1961-08-08 |
| 518 | Pyle & Salisbury | 38 | — | 3 | 1974-01-16 |
| 519 | Shults Well DR | 37 | — | 2 | 1970-04-03 |
| 520 | Pat Arnot Drilling Co. | 37 | — | 2 | 1961-02-04 |
| 521 | W L Hartley & Son | 37 | — | 2 | 1968-01-06 |
| 522 | Miller-Robinson-West | 37 | — | 2 | 1969-05-07 |
| 523 | Abco Drilling Co. | 37 | — | 1 | 1962-06-30 |
| 524 | Rudd W. Davis | 36 | — | 2 | 1971-10-01 |
| 525 | Cris-Well Drilling Co. | 36 | — | 4 | 1983-11-15 |
| 526 | Paul & Florence Stadeli Inc. | 36 | — | 4 | 1995-06-14 |
| 527 | C E Gordinier & Son | 36 | — | 2 | 1980-10-27 |
| 528 | Mosher Drilling Co. | 36 | — | 5 | 1971-07-02 |
| 529 | Miracle Drilling Co. | 35 | — | 4 | 1977-04-19 |
| 530 | S & H Well Drilling | 35 | — | 3 | 1994-08-15 |
| 531 | Douglas H Delano | 35 | — | 3 | 1996-05-12 |
| 532 | Christensen Well Drilling Co./Deceased 12/2013 | 35 | — | 7 | 2013-11-19 |
| 533 | Hoeck Well Drilling | 35 | — | 5 | 1983-07-08 |
| 534 | Rotary DR Co. | 35 | — | 2 | 1972-11-03 |
| 535 | Howard Arms | 35 | — | 1 | 1996-09-16 |
| 536 | Melvin L. Copley | 34 | — | 2 | 1980-04-18 |
| 537 | E M Gregory Drilling Co. | 34 | — | 3 | 1974-05-03 |
| 538 | S & M Drilling | 34 | — | 4 | 1980-06-12 |
| 539 | Deceased | 34 | — | 10 | 2005-10-17 |
| 540 | Randall Avellar | 34 | — | 3 | 1994-09-19 |
| 541 | Project Corporation | 34 | — | 7 | 1974-07-23 |
| 542 | Ted Lund | 34 | — | 2 | 1984-04-04 |
| 543 | Schoens Electric & Pump | 34 | — | 4 | 1977-03-09 |
| 544 | Frank Wagy Well Drilling | 34 | — | 2 | 1975-08-01 |
| 545 | Duffield Brothers Water Wells | 34 | — | 2 | 1971-11-15 |
| 546 | Robert Maynard Drilling | 33 | — | 1 | 1997-04-16 |
| 547 | G A Pruitt Well Drilling | 33 | — | 3 | 1964-09-29 |
| 548 | George Zent & Sons | 33 | — | 6 | 1970-07-29 |
| 549 | Brockett's Drilling Inc. | 33 | — | 6 | 2011-03-07 |
| 550 | Arent Well Drilling | 33 | — | 2 | 1978-08-05 |
| 551 | Coleman "Keith" Water Systems Inc. | 33 | — | 3 | 1991-11-29 |
| 552 | Charles K. Witcher | 33 | — | 3 | 1993-05-26 |
| 553 | Powell Well Drilling | 33 | — | 1 | 1980-05-27 |
| 554 | Harry Schaffer Drilling | 33 | — | 1 | 1988-11-03 |
| 555 | Otto Ellsworth | 32 | — | 2 | 1976-08-07 |
| 556 | George R Miller & Son | 32 | — | 2 | 1975-12-18 |
| 557 | Cunningham Well Drilling | 32 | — | 6 | 1975-05-10 |
| 558 | George R Miller&son Well Drill | 32 | — | 1 | 1973-08-27 |
| 559 | William R Long | 32 | — | 2 | 1994-11-08 |
| 560 | Dbm Contractors Inc. | 32 | — | 1 | 2021-02-23 |
| 561 | Submersible Pump & Drilling Co. | 31 | — | 5 | 1981-01-13 |
| 562 | G A Luttrell Well Drilling | 31 | — | 3 | 1975-07-26 |
| 563 | Ray Williams Drilling | 31 | — | 5 | 1997-03-01 |
| 564 | Central Oregon Well Drilling Co. | 31 | — | 2 | 1969-03-25 |
| 565 | Russell's Cottage Grove Well Drilling | 31 | — | 2 | 1963-11-08 |
| 566 | Larry Root & Sons | 31 | — | 3 | 1983-09-22 |
| 567 | Intervalley Drilling Co. | 30 | — | 6 | 1968-12-24 |
| 568 | George R Miller & Son Drilling | 30 | — | 3 | 1974-08-09 |
| 569 | John Beck Drilling Co. | 30 | — | 2 | 1984-04-02 |
| 570 | Western Water Wells Inc. | 30 | — | 1 | 1980-02-27 |
| 571 | Lee Well Drilling & Pump Service | 30 | — | 2 | 2000-08-18 |
| 572 | Northwest Hydro-Fracturing | 29 | — | 9 | 2010-08-31 |
| 573 | Ira Bopp | 29 | — | 2 | 1995-10-25 |
| 574 | Deceased 8-2000/Mike's Well Drilling | 29 | — | 2 | 1991-08-05 |
| 575 | Art Holte Manufacturing Co. | 29 | — | 2 | 1991-08-02 |
| 576 | Ken Mcclanahan | 29 | — | 3 | 1983-09-29 |
| 577 | Charles Jungmann Drilling Co. | 28 | — | 7 | 1982-05-12 |
| 578 | Staab Drilling | 28 | — | 3 | 2006-09-11 |
| 579 | Pitcher Drilling & Constructio | 28 | — | 4 | 1999-04-15 |
| 580 | Testing | 28 | — | 5 | 1978-05-09 |
| 581 | Chuck Stadeli | 28 | — | 6 | 2016-05-23 |
| 582 | Fox Well Drilling & Pump Servi | 28 | — | 4 | 2000-05-23 |
| 583 | David A Sartelle | 28 | — | 1 | 2001-08-27 |
| 584 | Enloe Drilling Co. | 28 | — | 5 | 1966-02-28 |
| 585 | C E Gordinier & Son Drilling Co. | 28 | — | 1 | 1980-11-03 |
| 586 | Scheler Drilling | 27 | — | 3 | 1997-01-13 |
| 587 | Duran Drilling | 27 | — | 3 | 1998-12-15 |
| 588 | Dale Beahm | 27 | — | 1 | 2001-10-29 |
| 589 | Highland Drilling | 27 | — | 3 | 1980-03-17 |
| 590 | W R Ille DR Co. | 27 | — | 3 | 1971-02-15 |
| 591 | Carter Drilling & Pump Service | 27 | — | 1 | 1996-04-04 |
| 592 | Robinsons Eola Drilling | 27 | — | 4 | 1974-09-17 |
| 593 | Kaufman Well Drilling | 27 | — | 1 | 2002-09-17 |
| 594 | Valley Well Drillers | 26 | — | 4 | 1969-06-03 |
| 595 | Ron Edgell Well Drilling Inc. | 26 | — | 2 | 2007-11-03 |
| 596 | T & P Well Drilling | 26 | — | 1 | 1962-09-01 |
| 597 | Oregon Drilling | 26 | — | 2 | 1996-04-09 |
| 598 | Art Carter Well Drilling | 26 | — | 3 | 1985-05-26 |
| 599 | H A Sevey Drilling | 26 | — | 2 | 1961-06-25 |
| 600 | Skinner & Son Well Drilling | 26 | — | 2 | 2007-01-24 |
| 601 | Dan Conway | 26 | — | 2 | 1998-05-04 |
| 602 | Wilcox Drilling Co. | 26 | — | 5 | 1987-02-18 |
| 603 | Floyd Sippel Well Drilling | 26 | — | 3 | 1996-05-06 |
| 604 | Western States Soil Cons. Inc. | 26 | — | 1 | 2009-06-24 |
| 605 | Pilcher Well Drilling | 25 | — | 4 | 1981-03-31 |
| 606 | Krieger Drilling Services | 25 | — | 1 | 1974-11-11 |
| 607 | Metzer Well Drilling | 25 | — | 1 | 1984-09-27 |
Best well drillers by county
County-level rankings — who actually drills where, by wells on record.
- Baker County (77)
- Benton County (76)
- Clackamas County (187)
- Clatsop County (50)
- Columbia County (71)
- Coos County (48)
- Crook County (89)
- Curry County (53)
- Deschutes County (146)
- Douglas County (97)
- Gilliam County (43)
- Grant County (66)
- Harney County (86)
- Hood River County (39)
- Jackson County (99)
- Jefferson County (77)
- Josephine County (81)
- Klamath County (124)
- Lake County (78)
- Lane County (116)
- Lincoln County (84)
- Linn County (140)
- Malheur County (66)
- Marion County (191)
- Morrow County (56)
- Multnomah County (132)
- Polk County (96)
- Sherman County (26)
- Tillamook County (85)
- Umatilla County (76)
- Union County (65)
- Wallowa County (36)
- Wasco County (66)
- Washington County (129)
- Wheeler County (50)
- Yamhill County (113)
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