All 14 drilling companies that have filed a well log in Custer County in the last ten years, 12 of them in the last five, ranked by recent work.
| Company | Last 5 yrs | Last 10 yrs | All time | Latest | First on file |
|---|---|---|---|---|---|
| Askin Drilling | 123 | 286 | 882 | 2026 | 1940 |
| Higgins Drilling Company | 40 | 88 | 305 | 2025 | 1957 |
| Olympus Technical Services | 21 | 27 | 27 | 2026 | 2020 |
| Haz Tech Drilling Inc | 14 | 40 | 142 | 2025 | 2003 |
| West Central Environmental Consultants | 4 | 24 | 24 | 2024 | 2019 |
| Sharp Drilling Inc | 2 | 9 | 20 | 2023 | 2000 |
| Ww Drilling | 2 | 5 | 6 | 2025 | 2015 |
| Pirtz Waterworx Llc | 2 | 2 | 2 | 2023 | 2023 |
| Sk Geotechnical Co | 1 | 1 | 1 | 2025 | 2025 |
| 406 Water Wells, Llc | 1 | 1 | 1 | 2026 | 2026 |
| Central Drilling Inc | 1 | 1 | 1 | 2023 | 2023 |
| Hansen Drilling | 1 | 1 | 1 | 2025 | 2025 |
| Gordon Drilling Inc | 0 | 2 | 6 | 2018 | 1984 |
| Montana Highway Dept. | 0 | 2 | 5 | 2019 | 1965 |
Source: MBMG Ground Water Information Center well logs. A count of public records, not a recommendation. How to check a driller. Depth and yield for Custer County: Montana Water Report.
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