Montana Well Data › Jefferson County
Jefferson County, Montana: well depth, water level & drilling cost
✓ 5,318 GWIC records · verified 2026-10-02
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How deep are wells in Jefferson County, Montana?
The median drilled well depth in Jefferson County is 181 ft, based on 5,251 wells with recorded depths in the state GWIC database. Half of all wells fall between 96 ft and 301 ft; 90% are shallower than 440 ft. Wells drilled since 2016 have a median depth of 247 ft.
How much does it cost to drill a well in Jefferson County?
Applying published per-foot rates to the local median depth of 247 ft: drilling and casing alone typically runs $6,175–$16,055; a complete system including pump, pressure tank, and hookup typically runs $14,820–$24,700. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Jefferson County?
The median static water level is 50 ft below ground surface (middle half of wells: 20 ft–100 ft), from 5,034 measurements.
How much water do wells in Jefferson County produce?
The median tested yield is 20 gpm (middle half: 10 gpm–30 gpm), from 4,980 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Jefferson County?
Companies by number of wells completed in this county since 2016, per filed well logs.
| Driller | Wells since 2016 |
|---|---|
| H & L DRILLING INC | 228 |
| A-10 DRILLING | 207 |
| WESTERN WATER WELLS | 101 |
| OKEEFE DRILLING CO | 95 |
| LINDSAY DRILLING CO INC | 90 |
| RED TIGER DRILLING | 72 |
| AAAA WATER WELL DRILLING INC | 51 |
| LINDSAY DRILLING CO | 27 |
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Well records by ZIP code in Jefferson County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Whitehall (59759) — 1,530 wells, median 109 ft
- Clancy (59634) — 1,235 wells, median 220 ft
- Boulder (59632) — 570 wells, median 105 ft
- Jefferson City (59638) — 532 wells, median 200 ft
- Cardwell (59721) — 329 wells, median 130 ft
- Basin (59631) — 201 wells, median 146 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.