Montana Well Data › Madison County
Madison County, Montana: well depth, water level & drilling cost
✓ 6,646 GWIC records · verified 2026-10-02
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How deep are wells in Madison County, Montana?
The median drilled well depth in Madison County is 100 ft, based on 6,539 wells with recorded depths in the state GWIC database. Half of all wells fall between 56 ft and 205 ft; 90% are shallower than 345 ft. Wells drilled since 2016 have a median depth of 160 ft.
How much does it cost to drill a well in Madison County?
Applying published per-foot rates to the local median depth of 160 ft: drilling and casing alone typically runs $4,000–$10,400; a complete system including pump, pressure tank, and hookup typically runs $9,600–$16,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Madison County?
The median static water level is 32 ft below ground surface (middle half of wells: 13 ft–85 ft), from 6,068 measurements.
How much water do wells in Madison County produce?
The median tested yield is 22 gpm (middle half: 15 gpm–35 gpm), from 5,965 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Madison County?
Companies by number of wells completed in this county since 2016, per filed well logs.
| Driller | Wells since 2016 |
|---|---|
| GRAHAM DRILLING INC | 598 |
| RED TIGER DRILLING | 162 |
| POTTS DRILLING INC | 133 |
| OKEEFE DRILLING CO | 63 |
| VAN DYKEN DRILLING INC | 55 |
| DIAMOND M DRILLING INC | 36 |
| AK DRILLING INC | 35 |
| GRAHAM DRILLING & PUMPS | 29 |
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Well records by ZIP code in Madison County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Ennis (59729) — 1,115 wells, median 130 ft
- Sheridan (59749) — 1,114 wells, median 69 ft
- Twin Bridges (59754) — 855 wells, median 50 ft
- Silver Star (59751) — 649 wells, median 77 ft
- Virginia City (59755) — 558 wells, median 165 ft
- Mc Allister (59740) — 433 wells, median 86 ft
- Cameron (59720) — 416 wells, median 187 ft
- Harrison (59735) — 386 wells, median 90 ft
- Pony (59747) — 312 wells, median 103 ft
- Norris (59745) — 293 wells, median 102 ft
- Alder (59710) — 153 wells, median 91 ft
Method: medians computed from GWIC records (site type WELL, non-abandoned; depths 0–5,000 ft). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.