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Best well drillers in San Francisco County, California
Not a pay-to-play list: these are the 53 drilling companies with wells
on record in San Francisco County, ranked by wells actually drilled here — 884 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.
53companies on record
25active since 2022
884wells in county record
| # | Company | In San Francisco Co. since 2016 | All-time in county | Statewide |
|---|
| 1 | Cascade Drilling L P | 67 | 85 | 2,827 |
| 2 | Malcolm Drilling Company Inc. | 50 | 50 | 63 |
| 3 | A R S Fracturing And Drilling Service | 34 | 76 | 86 |
| 4 | Vironex Technical Services LLC | 26 | 26 | 28 |
| 5 | American Construction And Supply Inc. | 21 | 24 | 1,685 |
| 6 | Pitcher Services LLC | 10 | 10 | 114 |
| 7 | Condon-Johnson & Associates Inc. | 9 | 10 | 25 |
| 8 | Environmental Control Associates | 3 | 3 | 277 |
| 9 | Cascade Drilling LP | 2 | 3 | 826 |
| 10 | Gregg Drilling LLC | 2 | 2 | 558 |
| 11 | T S A Drilling Inc. Dba Penecore Drilling | 2 | 2 | 577 |
| 12 | Taber Drilling | 2 | 2 | 87 |
| 13 | Pitcher Drilling Co. | 1 | 98 | 1,232 |
| 14 | Wilkinson Enterprises Inc. | 1 | 1 | 445 |
| 15 | Cascade Drilling Inc. - California | — | 108 | 3,167 |
| 16 | Woodward Drilling Company Inc. | — | 57 | 1,542 |
| 17 | W D C Exploration & Wells | — | 50 | 2,421 |
| 18 | Gregg Drilling & Testing Inc. | — | 46 | 4,828 |
| 19 | West Hazmat Drilling Corp | — | 34 | 1,702 |
| 20 | Kulchin-Condon & Asso | — | 26 | 26 |
| 21 | Mel Meyer | — | 25 | 101,127 |
| 22 | National E W P Inc. | — | 21 | 431 |
| 23 | Jeffrey David Harra | — | 16 | 109 |
| 24 | Exploration Geoservices Inc. | — | 12 | 956 |
| 25 | Resonantsonic International Inc. | — | 10 | 397 |
| 26 | Cornerstone Pump & Well Inc. | — | 10 | 90 |
| 27 | Vironex, Inc. | — | 9 | 649 |
| 28 | Western Well Drilling Co. Ltd | — | 8 | 842 |
| 29 | Maggiora Bros Drilling Inc. | — | 7 | 4,674 |
| 30 | Boart Longyear Company | — | 7 | 172 |
| 31 | Precision Sampling Inc. | — | 7 | 234 |
| 32 | V & W Drilling | — | 6 | 310 |
| 33 | Weeks Drilling And Pump Co. | — | 5 | 14,789 |
| 34 | Roadrunner Drilling & Pump Company Inc. | — | 3 | 205 |
| 35 | V T S Drilling LLC | — | 3 | 92 |
| 36 | Hew Drilling Co. | — | 3 | 38 |
| 37 | A B C Liovin Drilling Inc. | — | 2 | 1,281 |
| 38 | Xxx Soils Exploration SV | — | 2 | 48 |
| 39 | Myers Brothers Well Drilling Inc. | — | 1 | 2,865 |
| 40 | Clear Heart Drilling Inc. | — | 1 | 694 |
| 41 | Signal Drilling Company | — | 1 | 8,301 |
| 42 | Layne Christensen Company | — | 1 | 2,362 |
| 43 | Bertram Drilling Inc. | — | 1 | 1,171 |
| 44 | Robert Dawson Drilling & Pumps | — | 1 | 1,415 |
| 45 | S A Andresen All Terrain Exploration | — | 1 | 468 |
| 46 | Spectrum Exploration Inc. | — | 1 | 307 |
| 47 | Pacific Gas And Electric Company | — | 1 | 264 |
| 48 | Digges & Son Water Well Drilling | — | 1 | 250 |
| 49 | Pioneer Pump And Well Co. | — | 1 | 195 |
| 50 | Humboldt Drilling & Pump Co. | — | 1 | 131 |
| 51 | Orsolini Well Drilling | — | 1 | 112 |
| 52 | Ase Drilling Inc. | — | 1 | 82 |
| 53 | Bsk Associates | — | 1 | 37 |
Ranked by wells drilled in San Francisco 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 San Francisco County?
Cascade Drilling L P has drilled the most San Francisco County wells in the recent record — 67 since 2016, 85 in the county all-time.
How many well drilling companies work in San Francisco County?
53 companies in the DWR record have drilled wells in San Francisco County; 25 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 San Francisco County?
The median drilled depth in San Francisco County is 29 ft, based on 2,345 recorded wells. Depths, water levels, and yields are on the San Francisco County wells page.
Well depths, static water levels, tested yields, and drilling cost estimates for this county live on
the San Francisco County wells page.
Drill in San Francisco County?
If your company is on this list, your profile is free to claim — confirm your details and add your
contact information so San Francisco County property owners reach you directly.
Claim your profile Free to claim · built from DWR public well-log records.