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Best well drillers in San Luis Obispo County, California
Not a pay-to-play list: these are the 101 drilling companies with wells
on record in San Luis Obispo County, ranked by wells actually drilled here — 5,593 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.
101companies on record
49active since 2022
5,593wells in county record
| # | Company | In San Luis Obispo Co. since 2016 | All-time in county | Statewide |
|---|
| 1 | Filipponi-Thompson Drilling Inc. | 738 | 1,367 | 2,133 |
| 2 | Miller Drilling Co. | 346 | 1,363 | 1,775 |
| 3 | Mazzi Well Drilling | 172 | 203 | 209 |
| 4 | Business Midstate Drillers | 87 | 87 | 117 |
| 5 | Coast Drilling Inc. | 57 | 68 | 278 |
| 6 | Taylor Drilling And Pump Inc. | 30 | 83 | 341 |
| 7 | All American Drilling Inc. | 30 | 30 | 144 |
| 8 | Enloe Well Drilling | 27 | 165 | 279 |
| 9 | D & D Pumps | 26 | 29 | 46 |
| 10 | Pacific Coast Well Drilling Inc. | 25 | 54 | 337 |
| 11 | Pro-H20 Drilling And Pump Company | 23 | 30 | 39 |
| 12 | Gregg Drilling LLC | 19 | 19 | 558 |
| 13 | Matthew A. Bass | 13 | 13 | 62 |
| 14 | Farwest Corrosion Control Company | 11 | 19 | 2,649 |
| 15 | Myers Brothers Well Drilling Inc. | 10 | 46 | 2,865 |
| 16 | Jensen Drilling Company | 10 | 10 | 186 |
| 17 | Living Water Well Drilling | 8 | 8 | 441 |
| 18 | Farm Pump And Irrigation Company Inc. | 7 | 13 | 451 |
| 19 | Gregg Drilling & Testing Inc. | 6 | 12 | 4,828 |
| 20 | Aqua Engineering | 5 | 180 | 641 |
| 21 | S/G Testing Laboratories Inc. | 5 | 26 | 187 |
| 22 | Cascade Drilling L P | 4 | 5 | 2,827 |
| 23 | A B C Liovin Drilling Inc. | 3 | 3 | 1,281 |
| 24 | Matthew Davis Enterprises Inc. | 3 | 3 | 40 |
| 25 | Britton Exploration | 3 | 3 | 36 |
| 26 | Rottman Drilling Co. | 2 | 16 | 1,331 |
| 27 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | 2 | 12 | 1,716 |
| 28 | South Valley Pump & Drilling | 2 | 2 | 69 |
| 29 | National Corrosion | 2 | 2 | 28 |
| 30 | Bertram Drilling Inc. | 2 | 2 | 1,171 |
| 31 | Drill Hog | 2 | 2 | 74 |
| 32 | Kleinfelder Inc. | 2 | 2 | 54 |
| 33 | Signal Drilling Company | 1 | 222 | 8,301 |
| 34 | American Construction And Supply Inc. | 1 | 8 | 1,685 |
| 35 | Johnson Drilling Co. | 1 | 7 | 11,865 |
| 36 | Layne Christensen Company | 1 | 7 | 2,362 |
| 37 | Maggiora Bros Drilling Inc. | 1 | 3 | 4,674 |
| 38 | Camp S A Pump Company | 1 | 2 | 497 |
| 39 | Cascade Drilling LP | 1 | 1 | 826 |
| 40 | Canepa And Sons Inc. | 1 | 1 | 3,173 |
| 41 | Arsenal Well Drilling Inc. | 1 | 1 | 234 |
| 42 | Corrpro Companies Inc. | 1 | 1 | 737 |
| 43 | Well Industries Inc. | 1 | 1 | 558 |
| 44 | Stonehouse Well Drilling | 1 | 1 | 157 |
| 45 | Jensen Kelin Drilling | 1 | 1 | 94 |
| 46 | West Coast Exploration Inc. | 1 | 1 | 30 |
| 47 | Rauch Drilling Company Inc. | — | 407 | 520 |
| 48 | Floyd V Wells | — | 337 | 1,771 |
| 49 | Filipponi & Thompson Drilling Company | — | 180 | 303 |
| 50 | Central Coast Drilling | — | 115 | 122 |
| 51 | C. J Longwell | — | 81 | 217 |
| 52 | John W. Nairn | — | 35 | 39 |
| 53 | Bailey Drilling & Pump Inc. | — | 26 | 53 |
| 54 | Longwell & Taylor | — | 22 | 129 |
| 55 | Pacific Geoscience Inc. | — | 22 | 84 |
| 56 | Miller & Johnson | — | 21 | 25 |
| 57 | Old Creek Drilling | — | 19 | 94 |
| 58 | George Chambers | — | 18 | 51 |
| 59 | Whitten Pumps Inc. | — | 17 | 874 |
| 60 | Mel Meyer | — | 16 | 101,127 |
| 61 | Clark F Wells Corp | — | 11 | 83 |
| 62 | Robert Haylock "RH" Well Drilling | — | 11 | 48 |
| 63 | D. W. Slooum | — | 10 | 688 |
| 64 | Sierra Exploration Drilling Co. Inc. | — | 9 | 802 |
| 65 | Exploration Geoservices Inc. | — | 9 | 956 |
| 66 | Terry Mccormick | — | 8 | 26 |
| 67 | Myers Brothers Inc. | — | 6 | 796 |
| 68 | Bakersfield Pump Co. | — | 6 | 303 |
| 69 | E Stewart Johnston For Valley Pump | — | 6 | 135 |
| 70 | H W Bence | — | 6 | 47 |
| 71 | Don Redfeairn Drilling Co. | — | 5 | 186 |
| 72 | Robertson Bros | — | 5 | 68 |
| 73 | M & W Pumps Inc. | — | 5 | 35 |
| 74 | Arthur & Orum Well Drilling Inc. | — | 4 | 3,219 |
| 75 | Alexander Brothers | — | 4 | 903 |
| 76 | Howard Pump Inc. A California Corporation | — | 3 | 1,650 |
| 77 | Bfr Associates | — | 2 | 5,621 |
| 78 | Roger L. Nation | — | 2 | 796 |
| 79 | Vironex, Inc. | — | 2 | 649 |
| 80 | D W Slocum Water Well Drilling | — | 2 | 217 |
| 81 | Redfeairn R L Drilling | — | 2 | 195 |
| 82 | Castle Construction & Well Drilling Inc. | — | 2 | 142 |
| 83 | Soilprobe Inc. | — | 2 | 133 |
| 84 | F P I Well Drilling Inc. | — | 2 | 96 |
| 85 | Santa Ynez Valley Well Service | — | 2 | 47 |
| 86 | Gungle Drilling | — | 2 | 27 |
| 87 | Consolidated Testing Laboratories Inc. | — | 1 | 1,405 |
| 88 | Water Well Service Inc. | — | 1 | 145 |
| 89 | Myers Well Drilling Inc. | — | 1 | 763 |
| 90 | Bill Belknap | — | 1 | 2,758 |
| 91 | Myers Reverse, Inc. | — | 1 | 2,389 |
| 92 | Salinas Pump Company | — | 1 | 712 |
| 93 | Valley Pump & Drilling Co. | — | 1 | 475 |
| 94 | Testamerica Drilling Corp | — | 1 | 378 |
| 95 | Bill Rambeau Pump & Well Drilling | — | 1 | 288 |
| 96 | Sage Bros Drilling Co. | — | 1 | 232 |
| 97 | Fred W Porter & Son | — | 1 | 207 |
| 98 | SO Cal Pump And Well Drilling | — | 1 | 158 |
| 99 | L. Wade Inc. | — | 1 | 93 |
| 100 | Klein Knight Drlg Co. | — | 1 | 72 |
| 101 | H A Moore Drlng | — | 1 | 32 |
Ranked by wells drilled in San Luis Obispo 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 Luis Obispo County?
Filipponi-Thompson Drilling Inc. has drilled the most San Luis Obispo County wells in the recent record — 738 since 2016, 1,367 in the county all-time.
How many well drilling companies work in San Luis Obispo County?
101 companies in the DWR record have drilled wells in San Luis Obispo County; 49 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 Luis Obispo County?
The median drilled depth in San Luis Obispo County is 340 ft, based on 22,599 recorded wells. Depths, water levels, and yields are on the San Luis Obispo County wells page.
Well depths, static water levels, tested yields, and drilling cost estimates for this county live on
the San Luis Obispo County wells page.
Drill in San Luis Obispo County?
If your company is on this list, your profile is free to claim — confirm your details and add your
contact information so San Luis Obispo County property owners reach you directly.
Claim your profile Free to claim · built from DWR public well-log records.