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Best well drillers in Marin County, California
Not a pay-to-play list: these are the 78 drilling companies with wells
on record in Marin County, ranked by wells actually drilled here — 2,759 logged
wells in the California Department of Water Resources (DWR) Well Completion Reports database (records as of 2026-08-14). Every number links back to
the public record.
78companies on record
31active since 2022
2,759wells in county record
| # | Company | In Marin Co. since 2016 | All-time in county | Statewide |
|---|
| 1 | Weeks Drilling And Pump Co. | 32 | 830 | 14,789 |
| 2 | Clear Heart Drilling Inc. | 19 | 40 | 694 |
| 3 | Mickelson Enterprises Inc. | 19 | 21 | 174 |
| 4 | Cascade Drilling LP | 16 | 16 | 826 |
| 5 | Fisch Brothers Drilling, Inc. | 14 | 264 | 6,393 |
| 6 | American Construction And Supply Inc. | 13 | 58 | 1,685 |
| 7 | Gregg Drilling LLC | 13 | 13 | 558 |
| 8 | Irwin Well Drilling | 11 | 11 | 1,906 |
| 9 | Gregg Drilling & Testing Inc. | 5 | 35 | 4,828 |
| 10 | Pitcher Services LLC | 3 | 3 | 114 |
| 11 | Koenig Drilling | 3 | 3 | 39 |
| 12 | Forster Pump & Engineering Inc. | 2 | 193 | 197 |
| 13 | Pitcher Drilling Co. | 2 | 29 | 1,232 |
| 14 | Nutting And Jensen Drilling | 2 | 22 | 1,410 |
| 15 | Pacific Gas And Electric Company | 2 | 3 | 264 |
| 16 | Maggiora Bros Drilling Inc. | 2 | 2 | 4,674 |
| 17 | Anderson K Drilling, Inc. | 1 | 348 | 1,136 |
| 18 | Farwest Corrosion Control Company | 1 | 1 | 2,649 |
| 19 | Strickland Enterprises Inc. | 1 | 1 | 2,026 |
| 20 | Corrpro Companies Inc. | 1 | 1 | 737 |
| 21 | Gregory Drilling Incorporated | 1 | 1 | 143 |
| 22 | Fisch Bros Pump Service | — | 268 | 620 |
| 23 | Signal Drilling Company | — | 79 | 8,301 |
| 24 | American Well & Pump Service | — | 61 | 254 |
| 25 | Les Petersen Drilling & Pump Inc. | — | 55 | 4,096 |
| 26 | Bartley Pump Inc. | — | 50 | 596 |
| 27 | Bertram Drilling Inc. | — | 46 | 1,171 |
| 28 | Ballard & Foote | — | 41 | 870 |
| 29 | W D C Exploration & Wells | — | 33 | 2,421 |
| 30 | Pacific Coast Drilling | — | 23 | 262 |
| 31 | Mel Meyer | — | 18 | 101,127 |
| 32 | R F Keyt | — | 15 | 299 |
| 33 | Gopher Drilling | — | 14 | 79 |
| 34 | Dodson Contracting Co. | — | 11 | 113 |
| 35 | Oberto's Plumbing & Well Drilling | — | 11 | 78 |
| 36 | Cascade Drilling Inc. - California | — | 10 | 3,167 |
| 37 | Doshier And Gregson Drilling Inc. | — | 10 | 489 |
| 38 | Larbre Well Drilling And Pumps Inc. | — | 9 | 895 |
| 39 | Walter F Rettela | — | 9 | 389 |
| 40 | Eaton Drilling Co. LLC | — | 8 | 3,793 |
| 41 | Moss Roscoe Company | — | 6 | 1,220 |
| 42 | Clarence Woodbury | — | 6 | 113 |
| 43 | Atec Drilling Co. | — | 6 | 63 |
| 44 | Geoloop Drilling/Tom Moreland | — | 6 | 32 |
| 45 | Grade Drilling Co. | — | 5 | 43 |
| 46 | Tri-K Drilling | — | 5 | 935 |
| 47 | Martell Water Systems Inc. | — | 4 | 1,094 |
| 48 | Koenig Enterprises | — | 4 | 83 |
| 49 | National E W P Inc. | — | 3 | 431 |
| 50 | Cascade Drilling L P | — | 3 | 2,827 |
| 51 | Dejesus Pump & Well Drilling Inc. | — | 3 | 1,157 |
| 52 | Doshier-Gregson Inc. | — | 3 | 1,156 |
| 53 | Resonantsonic International Inc. | — | 3 | 397 |
| 54 | Aqua Science Engineers Inc. | — | 3 | 131 |
| 55 | American Well Drilling And Pump Service | — | 2 | 439 |
| 56 | Wilkinson Enterprises Inc. | — | 2 | 445 |
| 57 | West Hazmat Drilling Corp | — | 2 | 1,702 |
| 58 | Woodward Drilling Company Inc. | — | 2 | 1,542 |
| 59 | H A M Drilling Inc. | — | 2 | 273 |
| 60 | Heer Nar S | — | 2 | 245 |
| 61 | Cowart Well Drilling | — | 2 | 131 |
| 62 | Xxx | — | 2 | 113 |
| 63 | Viking Drillers Inc. | — | 2 | 83 |
| 64 | Canepa And Sons Inc. | — | 1 | 3,173 |
| 65 | Kvilhaug Drilling & Pump Inc. | — | 1 | 327 |
| 66 | Bess D Pump & Well Elect | — | 1 | 359 |
| 67 | Bfr Associates | — | 1 | 5,621 |
| 68 | Crislip Drilling Company | — | 1 | 1,174 |
| 69 | Kile's Well Drilling | — | 1 | 943 |
| 70 | Western Well Drilling Co. Ltd | — | 1 | 842 |
| 71 | Precision Sampling Inc. | — | 1 | 234 |
| 72 | Island Drilling | — | 1 | 221 |
| 73 | Trc Solutions Inc. | — | 1 | 137 |
| 74 | Joseph F. Leisek | — | 1 | 126 |
| 75 | Trinity Source Group Inc. | — | 1 | 67 |
| 76 | Xxx Soils Exploration SV | — | 1 | 48 |
| 77 | A J Oberto | — | 1 | 47 |
| 78 | Dudley Newton JR | — | 1 | 38 |
Ranked by wells drilled in Marin County since 2016 (then all-time), from the full DWR
record. A ★ marks a featured sponsor — sponsors must appear in the county record to be listed, and
the ranking below them is never reordered.
Who drills the most wells in Marin County?
Weeks Drilling And Pump Co. has drilled the most Marin County wells in the recent record — 32 since 2016, 830 in the county all-time.
How many well drilling companies work in Marin County?
78 companies in the DWR record have drilled wells in Marin County; 31 of them have drilled somewhere in California since 2022. Smaller operators below the record threshold may also serve the area.
How deep is a typical well in Marin County?
The median drilled depth in Marin County is 150 ft, based on 3,929 recorded wells. Depths, water levels, and yields are on the Marin County wells page.
Well depths, static water levels, tested yields, and drilling cost estimates for this county live on
the Marin County wells page.
Drill in Marin County?
If your company is on this list, your profile is free to claim — confirm your details and add your
contact information so Marin County property owners reach you directly.
Claim your profile Free to claim · built from DWR public well-log records.