Montana water data · Zip Code in Yellowstone County
ZIP 59105: well depth, groundwater and water rights
What the public record says about water in ZIP code 59105: 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 4,021 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (ZIP Code Tabulation Area)
Wells on record
2,157
22.5 per sq mi
Median well depth
40 ft
half of wells 25–115 ft
Median static water level
16 ft
1,881 measurements
Median tested yield
20 gpm
1,838 pump tests
Well depth
How deep are wells in ZIP 59105?
Of 2,054 wells with a recorded total depth, the median is 40 feet. Half were drilled between 25 and 115 feet; one in ten went deeper than 185 feet and one in ten found water shallower than 21 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
16 ft
median depth to water at rest · half between 12 and 35 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
20 gpm
median tested yield · half between 12 and 30 gpm
7% of tested wells produced under 5 gallons per minute and 56% 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 59105
206 wells have been completed here since 2016, 19 of them in the last twelve months. The newest log on file was completed July 7, 2026. Records run back to 1886.
What the wells are for
- Domestic1,561
- Irrigation434
- Stockwater219
- Monitoring179
- Test Well14
How they were drilled
- Rotary818
- Forward Rotary573
- Cable165
- Driven81
Drillers filing well logs in ZIP 59105
- American Drilling & Supply56 since 2016 · 2026
- Mayes Drilling Inc54 since 2016 · 2026
- Bertram Drilling Inc41 since 2016 · 2025
- Haz Tech Drilling Inc13 since 2016 · 2022
- Aaqua Drilling Inc10 since 2016 · 2024
- Gary's Drilling Inc.9 since 2016 · 2021
- Gary Mayes Drilling Inc.7 since 2016 · 2019
- Cascade Drilling Lp7 since 2016 · 2017
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 59105
Montana DNRC lists 1,753 water rights with a point of diversion inside this area: 1,612 groundwater and 141 surface water, 1,676 of them active. The median priority date is 1985, and the oldest claim dates to 1889.
Types of right
- Ground Water Certificate1,454
- Statement Of Claim244
- Provisional Permit30
- Exempt Notice23
- Irrigation District1
Purposes
- Domestic783
- Lawn And Garden247
- Domestic; Lawn And Garden186
- Stock149
- Domestic; Stock77
DNRC basins
- 43Q1,752
- 43D1
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 59105 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.
- Judith River Formation (of Montana Group)402 wells · 25% · median 135 ft
- Alluvium (pleistocene)401 wells · 25% · median 26 ft
- Alluvium (holocene)328 wells · 21% · median 26 ft
- Eagle Sandstone214 wells · 13% · median 110 ft
- Terrace Deposits (pleistocene)137 wells · 9% · median 25 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 59105
Petroleum releases
52
9 open · 43 resolved
Superfund program sites
0
none on the National Priorities List
Registered tank facilities
59
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 2021. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.