The drilling companies that have actually completed wells within 15 miles of Mammoth, ranked by how many, from the well logs each company filed with the state. Mammoth is in Madison County.
In the last five years, 191 wells were completed within 15 miles of Mammoth, by 15 different drilling companies. The most active was Okeefe Drilling Co, with 39. The three busiest companies drilled 51 percent of them, with the rest spread across smaller outfits.
| Company | Wells within 15 mi | Latest | Closest well |
|---|---|---|---|
| Okeefe Drilling Co | 39 | 2026 | 0 mi |
| Red Tiger Drilling | 36 | 2026 | 8 mi |
| Ak Drilling Inc | 20 | 2026 | 4 mi |
| Western Water Wells | 20 | 2026 | 0 mi |
| Graham Drilling Inc | 18 | 2025 | 2 mi |
| A-10 Drilling | 12 | 2025 | 10 mi |
| Diamond M Drilling Inc | 8 | 2025 | 5 mi |
| Potts Drilling Inc | 8 | 2025 | 2 mi |
| Old Town Drilling | 7 | 2026 | 7 mi |
| Van Dyken Drilling Inc | 7 | 2024 | 6 mi |
| Excel Pump And Well Inc. | 6 | 2024 | 6 mi |
| Vidic Drilling Inc | 4 | 2025 | 6 mi |
| Aaaa Water Well Drilling Inc | 1 | 2022 | 15 mi |
| Graham Drilling & Pumps | 1 | 2026 | 13 mi |
| Lindsay Drilling Co Inc | 1 | 2026 | 13 mi |
Source: MBMG Ground Water Information Center well logs completed 2021 to 2026, counted by distance from the center of Mammoth. Only logs that name a company are ranked. This is a count of public records, not a recommendation; see how to check a driller before you hire. For depth, yield and water level near a specific property, see Montana Water Report.
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