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Montana water data · Zip Code in Yellowstone County

ZIP 59101: well depth, groundwater and water rights

What the public record says about water in ZIP code 59101: 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 7,004 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

3,847

6.5 per sq mi

Median well depth

27 ft

half of wells 21–46 ft

Median static water level

14 ft

2,993 measurements

Median tested yield

25 gpm

2,190 pump tests

Well depth

How deep are wells in ZIP 59101?

Of 3,384 wells with a recorded total depth, the median is 27 feet. Half were drilled between 21 and 46 feet; one in ten went deeper than 120 feet and one in ten found water shallower than 18 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.

under 50 ft
76%
50–100 ft
11%
100–200 ft
7%
200–300 ft
3%
300–500 ft
2%
500 ft and deeper
1%

Static water level

14 ft

median depth to water at rest · half between 10 and 22 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

25 gpm

median tested yield · half between 13 and 35 gpm

10% of tested wells produced under 5 gallons per minute and 67% 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 59101

671 wells have been completed here since 2016, 31 of them in the last twelve months. The newest log on file was completed August 27, 2026. Records run back to 1885.

What the wells are for

  • Domestic1,521
  • Monitoring1,411
  • Irrigation618
  • Stockwater346
  • Unused47

How they were drilled

  • Rotary1,252
  • Hollowstem Auger490
  • Forward Rotary401
  • Cable164

Drillers filing well logs in ZIP 59101

  • American Drilling & Supply159 since 2016 · 2026
  • Haz Tech Drilling Inc140 since 2016 · 2026
  • Cascade Drilling Lp128 since 2016 · 2024
  • Bertram Drilling Inc56 since 2016 · 2025
  • Olympus Technical Services27 since 2016 · 2025
  • Aaqua Drilling Inc26 since 2016 · 2026
  • West Central Environmental Consultants26 since 2016 · 2026
  • Sk Geotechnical Co22 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 ZIP 59101

Montana DNRC lists 2,642 water rights with a point of diversion inside this area: 1,966 groundwater and 676 surface water, 2,391 of them active. The median priority date is 1981, and the oldest claim dates to 1868.

Types of right

  • Ground Water Certificate1,658
  • Statement Of Claim744
  • Reserved Claim112
  • Provisional Permit78
  • Exempt Notice39

Purposes

  • Domestic726
  • Stock678
  • Lawn And Garden389
  • Irrigation211
  • Domestic; Lawn And Garden154

DNRC basins

  • 43Q2,041
  • 43E555
  • 43D23
  • 43P23

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 59101 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.

  • Terrace Deposits (holocene)960 wells · 46% · median 25 ft
  • Alluvium (holocene)447 wells · 21% · median 29 ft
  • Terrace Deposits (pleistocene)198 wells · 9% · median 40 ft
  • Eagle Sandstone156 wells · 7% · median 230 ft
  • Judith River Formation (of Montana Group)71 wells · 3% · median 155 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 59101

Petroleum releases

234

62 open · 172 resolved

Superfund program sites

2

2 on or proposed for the NPL

Registered tank facilities

279

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 2026. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.