Montana water data · Zip Code in Mineral County
ZIP 59866: well depth, groundwater and water rights
What the public record says about water in ZIP code 59866: 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 1,080 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (ZIP Code Tabulation Area)
Wells on record
490
2.2 per sq mi
Median well depth
120 ft
half of wells 70–171 ft
Median static water level
46 ft
372 measurements
Median tested yield
30 gpm
433 pump tests
Well depth
How deep are wells in ZIP 59866?
Of 470 wells with a recorded total depth, the median is 120 feet. Half were drilled between 70 and 171 feet; one in ten went deeper than 225 feet and one in ten found water shallower than 41 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
46 ft
median depth to water at rest · half between 18 and 70 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 20 and 50 gpm
7% of tested wells produced under 5 gallons per minute and 75% 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 ZIP 59866
83 wells have been completed here since 2016, 3 of them in the last twelve months. The newest log on file was completed September 23, 2026. Records run back to 1922.
What the wells are for
- Domestic385
- Irrigation49
- Public Water Supply25
- Monitoring16
- Stockwater16
How they were drilled
- Rotary257
- Churn57
- Foward Rotary35
- Cable28
Drillers filing well logs in ZIP 59866
- Camp Well Drilling And Pump Service32 since 2016 · 2026
- Callison Well Drilling25 since 2016 · 2026
- Ace Drilling6 since 2016 · 2023
- Camp Well Drilling & Pump Supply6 since 2016 · 2024
- Steve Berg Well Drilling3 since 2016 · 2019
- North Star Drilling Inc3 since 2016 · 2024
- Jeromes Drilling Co1 since 2016 · 2017
- Kane Well Drilling & Pump Service200 all-time · 2006
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 ZIP 59866
Montana DNRC lists 572 water rights with a point of diversion inside this area: 475 groundwater and 97 surface water, 536 of them active. The median priority date is 1986, and the oldest claim dates to 1899.
Types of right
- Ground Water Certificate366
- Statement Of Claim147
- Provisional Permit38
- Exempt Notice16
- Water Reservation3
Purposes
- Domestic220
- Domestic; Lawn And Garden86
- Irrigation42
- Stock32
- Commercial30
DNRC basins
- 76M569
- 76F1
- 76N1
- 76G1
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 ZIP 59866 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)109 wells · 36% · median 100 ft
- Sand And Gravel (tertiary)92 wells · 31% · median 165 ft
- Alluvium (holocene)48 wells · 16% · median 39 ft
- Belt Supergroup29 wells · 10% · median 240 ft
- Sand And Gravel (pleistocene)8 wells · 3% · median 70 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 ZIP 59866
Petroleum releases
10
0 open · 10 resolved
Superfund program sites
0
none on the National Priorities List
Registered tank facilities
8
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 2023. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.