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Best well drillers in Mariposa County, California
Not a pay-to-play list: these are the 68 drilling companies with wells
on record in Mariposa County, ranked by wells actually drilled here — 6,660 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.
68companies on record
25active since 2022
6,660wells in county record
| # | Company | In Mariposa Co. since 2016 | All-time in county | Statewide |
|---|
| 1 | Yosemite Falls Inc. | 339 | 657 | 706 |
| 2 | Wellco Drilling Inc. | 75 | 196 | 1,375 |
| 3 | Walt Bannon Drilling Inc. | 27 | 138 | 2,498 |
| 4 | Tanko Bros Inc. | 18 | 407 | 2,617 |
| 5 | Canepa And Sons Inc. | 14 | 91 | 3,173 |
| 6 | Mariposa Well Drilling Company Inc. | 12 | 1,101 | 1,146 |
| 7 | Yosemite Falls Well Drilling | 1 | 423 | 464 |
| 8 | H & B Drilling And Sons LLC | 1 | 1 | 414 |
| 9 | Sar Construction | 1 | 1 | 47 |
| 10 | Atwater Well Drilling | 1 | 1 | 40 |
| 11 | Stroming Machinery | — | 2,346 | 2,391 |
| 12 | Bannon Walt Drilling Co. Inc. | — | 286 | 978 |
| 13 | Bootjack Drilling Inc. | — | 206 | 649 |
| 14 | American Technological Drilling Service Inc. | — | 135 | 1,385 |
| 15 | H & B Drilling | — | 72 | 1,248 |
| 16 | Bill Belknap | — | 71 | 2,758 |
| 17 | Signal Drilling Company | — | 50 | 8,301 |
| 18 | Blake Hennings | — | 49 | 1,362 |
| 19 | Hennings Bros Drilling Co. Inc. | — | 48 | 6,823 |
| 20 | Diversified Exploration Co. Inc. | — | 41 | 751 |
| 21 | Jack Carrell Drilling Inc. | — | 33 | 123 |
| 22 | Dodson Contracting Co. | — | 30 | 113 |
| 23 | Johnson Drilling Co. | — | 25 | 11,865 |
| 24 | Maxwell Drilling | — | 23 | 61 |
| 25 | Calwater Drilling Company Inc. | — | 22 | 5,421 |
| 26 | ED Fields Water Well Drilling | — | 21 | 234 |
| 27 | Rockwell Drilling Co. | — | 20 | 244 |
| 28 | Sierra Drilling Co. | — | 17 | 99 |
| 29 | Carrell & Canepa Drilling | — | 14 | 79 |
| 30 | Simpson Drilling Company | — | 12 | 644 |
| 31 | Mcgann Drilling | — | 12 | 254 |
| 32 | Masellis Drilling Inc. | — | 11 | 6,081 |
| 33 | National E W P Inc. | — | 9 | 431 |
| 34 | Martin Pump & Supply Inc. | — | 9 | 2,524 |
| 35 | Olson's Plbg & Heating | — | 8 | 308 |
| 36 | Arthur & Orum Well Drilling Inc. | — | 7 | 3,219 |
| 37 | Rock Well Drilling | — | 7 | 543 |
| 38 | Levnard T Larson | — | 5 | 681 |
| 39 | Ritchey Bros | — | 4 | 183 |
| 40 | Taylor & Taber Drillers | — | 4 | 139 |
| 41 | Richardson Ernest Walker | — | 4 | 129 |
| 42 | Maggiora Bros Drilling Inc. | — | 3 | 4,674 |
| 43 | Fronk's Mountain Drilling | — | 3 | 2,378 |
| 44 | Starr Drilling And Pump Co. | — | 3 | 875 |
| 45 | Osterberg And Stewart | — | 3 | 636 |
| 46 | Scott Xxx PC Exploration Inc. | — | 3 | 154 |
| 47 | Orin F Gaskin & Edward F Swiecki Drilling | — | 3 | 75 |
| 48 | Quality Well Drillers Inc. | — | 2 | 3,524 |
| 49 | Weimer Stan Enterprises Inc. | — | 2 | 377 |
| 50 | K F Guernsey | — | 2 | 119 |
| 51 | DP Drilling | — | 2 | 30 |
| 52 | Myers Brothers Well Drilling Inc. | — | 1 | 2,865 |
| 53 | Martell Water Systems Inc. | — | 1 | 1,094 |
| 54 | Guardino Pump & Well | — | 1 | 482 |
| 55 | Johnson Teddy J | — | 1 | 797 |
| 56 | Osterberg And Carroll | — | 1 | 561 |
| 57 | Everett A Loewenstein | — | 1 | 357 |
| 58 | Seanaco Inc. | — | 1 | 327 |
| 59 | Clovis Pump & Water Well | — | 1 | 323 |
| 60 | Aquarius Drilling And Pump Co. | — | 1 | 288 |
| 61 | Layne-Western Co. Inc. | — | 1 | 255 |
| 62 | Castle Construction & Well Drilling Inc. | — | 1 | 142 |
| 63 | Thomas F Madsen | — | 1 | 128 |
| 64 | Stump Drilling Corp | — | 1 | 84 |
| 65 | M S Seebeck & Son | — | 1 | 75 |
| 66 | S I Guardino | — | 1 | 43 |
| 67 | Hoffman J F Well Driller | — | 1 | 41 |
| 68 | L Larson | — | 1 | 36 |
Ranked by wells drilled in Mariposa 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 Mariposa County?
Yosemite Falls Inc. has drilled the most Mariposa County wells in the recent record — 339 since 2016, 657 in the county all-time.
How many well drilling companies work in Mariposa County?
68 companies in the DWR record have drilled wells in Mariposa 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 Mariposa County?
The median drilled depth in Mariposa County is 220 ft, based on 7,236 recorded wells. Depths, water levels, and yields are on the Mariposa County wells page.
Well depths, static water levels, tested yields, and drilling cost estimates for this county live on
the Mariposa County wells page.
Drill in Mariposa County?
If your company is on this list, your profile is free to claim — confirm your details and add your
contact information so Mariposa County property owners reach you directly.
Claim your profile Free to claim · built from DWR public well-log records.