Montana water data · County
Mineral County: well depth, groundwater and water rights
What the public record says about water in Mineral County: how deep wells go, where the water table sits, what wells produce, which water rights are on file, and which documented environmental sites are nearby. Area statistics orient you; a property report analyzes the records around one specific parcel.
Updated September 2026 · Based on 4,283 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder
Wells on record
1,744
1,665 with recorded depth
Median well depth
122 ft
half of wells 74–185 ft
Median static water level
60 ft
1,505 measurements
Median tested yield
30 gpm
1,576 pump tests
Well depth
How deep are wells in Mineral County?
Of 1,665 wells with a recorded total depth, the median is 122 feet. Half were drilled between 74 and 185 feet; one in ten went deeper than 301 feet and one in ten found water shallower than 45 feet. Depth is set by local geology and position on the landscape, both of which change over short distances, so the spread matters as much as the median.
Static water level
60 ft
median depth to water at rest · half between 25 and 105 ft
The static level is how far below ground the water stands before pumping, measured by the driller at completion. It affects pump setting and operating cost, and it moves with season and with neighbouring use.
Well yield
30 gpm
median tested yield · half between 15 and 40 gpm
8% of tested wells produced under 5 gallons per minute and 70% produced 20 or more. These are short completion tests, not sustained-capacity tests; a household typically needs 3 to 5 gpm with storage.
Drilling activity
Recent well drilling in Mineral County
345 wells have been completed here since 2016, 19 of them in the last twelve months. The newest log on file was completed September 23, 2026. Records run back to 1900.
What the wells are for
- Domestic1,416
- Irrigation106
- Monitoring71
- Public Water Supply66
- Stockwater52
How they were drilled
- Rotary988
- Churn158
- Foward Rotary147
- Cable102
Drillers filing well logs in Mineral County
- Callison Well Drilling86 since 2016 · 2026
- Camp Well Drilling And Pump Service83 since 2016 · 2026
- Jeromes Drilling Co57 since 2016 · 2025
- Camp Well Drilling & Pump Supply29 since 2016 · 2026
- Western Montana Drilling Co.23 since 2016 · 2026
- Steve Berg Well Drilling17 since 2016 · 2023
- Western Montana Drilling Company14 since 2016 · 2024
- Ace Drilling11 since 2016 · 2025
Ranked by well logs filed with GWIC, public record only. Not an endorsement, a referral or a paid listing; we have no business relationship with these companies. Verify licensing with the Montana Board of Water Well Contractors before hiring.
Water rights
Water rights on file in Mineral County
Montana DNRC lists 2,430 water rights in the county: 1,701 groundwater and 729 surface water, 2,220 of them active. The median priority date is 1981, and the oldest claim dates to 1870.
Types of right
- Ground Water Certificate1,310
- Statement Of Claim883
- Provisional Permit116
- Exempt Notice52
- Converted Terminates20
Purposes
- Domestic837
- Domestic; Lawn And Garden290
- Irrigation282
- Stock220
- Mining99
DNRC basins
- 76M2,426
- 76H2
- 76G1
- 76N1
Area totals describe the neighbourhood, not any one parcel. Montana publishes no authoritative link between a parcel and a water right; whether a right attaches to a specific property is a property-level question that our reports answer with the DNRC abstract linked.
Aquifers and geology
What wells in Mineral County draw from
Drillers record the aquifer a well is completed in. The units below account for the wells here that carry an aquifer assignment; the median depth beside each is for wells completed in that unit.
- Alluvium (pleistocene)620 wells · 55% · median 120 ft
- Alluvium (holocene)189 wells · 17% · median 42 ft
- Belt Supergroup182 wells · 16% · median 250 ft
- Sand And Gravel (tertiary)92 wells · 8% · median 165 ft
- Sand And Gravel (pleistocene)31 wells · 3% · median 140 ft
Aquifer assignments are the driller's, recorded at completion, and many older logs carry none. Absence of an assignment is not evidence about the geology.
Environmental groundwater screening
Documented environmental sites in Mineral County
Petroleum releases
51
3 open · 48 resolved
Superfund program sites
2
1 on or proposed for the NPL
Registered tank facilities
56
underground storage tanks, current and historical
A documented release or site in the area is not evidence that any particular well is affected. Whether a release reaches a well depends on groundwater flow direction, geology, well depth and construction, the extent of the plume and the cleanup performed. The most recent release reported here dates to 2025. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.