All 26 drilling companies that have filed a well log in Big Horn County in the last ten years, 20 of them in the last five, ranked by recent work.
| Company | Last 5 yrs | Last 10 yrs | All time | Latest | First on file |
|---|---|---|---|---|---|
| Gary'S Drilling Inc. | 40 | 43 | 48 | 2026 | 2011 |
| American Drilling & Supply | 20 | 59 | 243 | 2025 | 1990 |
| Bertram Drilling Inc | 19 | 24 | 34 | 2025 | 2001 |
| A-1 Drilling | 11 | 11 | 16 | 2024 | 2015 |
| Pioneer Technical Services Inc | 9 | 9 | 9 | 2024 | 2022 |
| Wwc Engineering | 7 | 10 | 31 | 2025 | 1976 |
| Askin Drilling | 6 | 13 | 62 | 2026 | 1978 |
| Olympus Technical Services | 6 | 9 | 9 | 2025 | 2019 |
| Higgins Drilling Company | 5 | 14 | 37 | 2026 | 1999 |
| Gary Mayes Drilling Inc | 5 | 9 | 42 | 2026 | 2002 |
| Ww Drilling | 3 | 4 | 4 | 2023 | 2018 |
| Holt Services Inc | 3 | 3 | 3 | 2022 | 2022 |
| Thomas, Dean, And Hoskins, Inc. | 3 | 3 | 3 | 2026 | 2026 |
| Mayes Drilling Inc | 2 | 5 | 33 | 2024 | 1991 |
| Douglas Drilling | 2 | 4 | 25 | 2022 | 2000 |
| Western Water Wells | 2 | 2 | 2 | 2022 | 2022 |
| American Engineering Testing Inc | 2 | 2 | 2 | 2021 | 2021 |
| West Central Environmental Consultants | 2 | 2 | 2 | 2025 | 2025 |
| Aaqua Drilling Inc | 1 | 1 | 52 | 2024 | 1993 |
| A3 Services Llc | 1 | 1 | 5 | 2024 | 2014 |
| Haz Tech Drilling Inc | 0 | 17 | 67 | 2020 | 2003 |
| Mt Dept Of Transportation | 0 | 8 | 92 | 2017 | 1974 |
| H & H Drilling | 0 | 5 | 65 | 2017 | 1989 |
| Sk Geotechnical Co | 0 | 1 | 12 | 2017 | 2004 |
| Cloud Peak Energy | 0 | 1 | 6 | 2018 | 2006 |
| Clayton Larson | 0 | 1 | 5 | 2017 | 2010 |
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 Big Horn County: Montana Water Report.
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