Montana Well Data › Lewis and Clark County
Lewis and Clark County, Montana: well depth, water level & drilling cost
✓ 17,181 GWIC records · verified 2026-10-02
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How deep are wells in Lewis and Clark County, Montana?
The median drilled well depth in Lewis and Clark County is 105 ft, based on 16,902 wells with recorded depths in the state GWIC database. Half of all wells fall between 60 ft and 195 ft; 90% are shallower than 340 ft. Wells drilled since 2016 have a median depth of 140 ft.
How much does it cost to drill a well in Lewis and Clark County?
Applying published per-foot rates to the local median depth of 140 ft: drilling and casing alone typically runs $3,500–$9,100; a complete system including pump, pressure tank, and hookup typically runs $8,400–$14,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Lewis and Clark County?
The median static water level is 39 ft below ground surface (middle half of wells: 17 ft–73 ft), from 16,101 measurements.
How much water do wells in Lewis and Clark County produce?
The median tested yield is 20 gpm (middle half: 15 gpm–30 gpm), from 15,541 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Lewis and Clark County?
Companies by number of wells completed in this county since 2016, per filed well logs.
| Driller | Wells since 2016 |
|---|---|
| H & L DRILLING INC | 885 |
| A-10 DRILLING | 700 |
| WESTERN WATER WELLS | 449 |
| AAAA WATER WELL DRILLING INC | 176 |
| MT POVERTY WATER WELL DRILLING | 112 |
| LINDSAY DRILLING CO INC | 106 |
| OKEEFE DRILLING CO | 76 |
| 406 WATER WELLS, LLC | 56 |
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Well records by ZIP code in Lewis and Clark County
Median depth, water level, and yield for each ZIP code with recorded wells.
- East Helena (59635) — 4,367 wells, median 120 ft
- Helena (59602) — 3,229 wells, median 156 ft
- Helena (59604) — 2,286 wells, median 80 ft
- Helena (59601) — 1,927 wells, median 58 ft
- Fort Harrison (59636) — 1,822 wells, median 160 ft
- Lincoln (59639) — 1,551 wells, median 54 ft
- Wolf Creek (59648) — 915 wells, median 100 ft
- Augusta (59410) — 695 wells, median 42 ft
- Helena (59623) — 464 wells, median 200 ft
- Helena (59620) — 463 wells, median 200 ft
- Canyon Creek (59633) — 439 wells, median 145 ft
- Helena (59625) — 427 wells, median 100 ft
- Marysville (59640) — 275 wells, median 155 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.