Montana WaterReport
Check a property

Montana water data · Zip Code in Hill County

ZIP 59521: well depth, groundwater and water rights

What the public record says about water in ZIP code 59521: 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 930 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

719

2.5 per sq mi

Median well depth

66 ft

half of wells 41–117 ft

Median static water level

18 ft

457 measurements

Median tested yield

11 gpm

495 pump tests

Well depth

How deep are wells in ZIP 59521?

Of 616 wells with a recorded total depth, the median is 66 feet. Half were drilled between 41 and 117 feet; one in ten went deeper than 172 feet and one in ten found water shallower than 25 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
36%
50–100 ft
30%
100–200 ft
27%
200–300 ft
6%
300–500 ft
1%
500 ft and deeper
0%

Static water level

18 ft

median depth to water at rest · half between 11 and 34 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

11 gpm

median tested yield · half between 7 and 20 gpm

13% of tested wells produced under 5 gallons per minute and 30% 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 59521

32 wells have been completed here since 2016. The newest log on file was completed August 27, 2025. Records run back to 1885.

What the wells are for

  • Domestic427
  • Unused73
  • Stockwater70
  • Monitoring52
  • Public Water Supply15

How they were drilled

  • Rotary142
  • Cable130
  • Forward Rotary94
  • Unknown72

Drillers filing well logs in ZIP 59521

  • Jacobson Drilling10 since 2016 · 2025
  • Thomas, Dean, And Hoskins, Inc.10 since 2016 · 2025
  • Hi-line Drilling Inc5 since 2016 · 2024
  • Boland Drilling5 since 2016 · 2022
  • Hickel & Tooke Drilling Co141 all-time · 2011
  • Parker Drilling65 all-time · 1980
  • Briggs Drilling Co64 all-time · 1970
  • Simpson Drilling Co.28 all-time · 1984

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 59521

Montana DNRC lists 186 water rights with a point of diversion inside this area: 87 groundwater and 99 surface water, 158 of them active. The median priority date is 1951, and the oldest claim dates to 1885.

Types of right

  • Statement Of Claim127
  • Ground Water Certificate35
  • Reserved Claim10
  • Stockwater Permit8
  • Exempt Notice3

Purposes

  • Stock102
  • Domestic28
  • Irrigation20
  • Domestic; Lawn And Garden8
  • Commercial5

DNRC basins

  • 40H147
  • 40G37
  • 40J2

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 59521 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)15 wells · 58% · median 100 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 59521

Petroleum releases

6

1 open · 5 resolved

Superfund program sites

1

none on the National Priorities List

Registered tank facilities

18

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.