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Montana water data · Community in Cascade County

Sun Prairie: well depth, groundwater and water rights

What the public record says about water in Sun Prairie: 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 187 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (place boundary)

Wells on record

76

14.3 per sq mi

Median well depth

138 ft

half of wells 112–180 ft

Median static water level

17 ft

66 measurements

Median tested yield

30 gpm

67 pump tests

Well depth

How deep are wells in Sun Prairie?

Of 75 wells with a recorded total depth, the median is 138 feet. Half were drilled between 112 and 180 feet; one in ten went deeper than 205 feet and one in ten found water shallower than 37 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
11%
50–100 ft
11%
100–200 ft
63%
200–300 ft
8%
300–500 ft
0%
500 ft and deeper
8%

Static water level

17 ft

median depth to water at rest · half between 8 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

30 gpm

median tested yield · half between 20 and 55 gpm

1% of tested wells produced under 5 gallons per minute and 78% 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 Sun Prairie

8 wells have been completed here since 2016. The newest log on file was completed March 8, 2024. Records run back to 1937.

What the wells are for

  • Domestic53
  • Stockwater15
  • Monitoring6
  • Public Water Supply5
  • Irrigation2

How they were drilled

  • Rotary32
  • Cable16
  • Churn9
  • Cable Tool2

Drillers filing well logs in Sun Prairie

  • Aquasource Drilling Llc3 since 2016 · 2024
  • Boland Drilling2 since 2016 · 2017
  • Byrne27 all-time · 2001
  • Sb Rl6 all-time · 1999
  • Taylor5 all-time · 1973
  • Anderson Drilling3 all-time · 1977
  • Poverty Drilling3 all-time · 2001

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 Sun Prairie

Montana DNRC lists 108 water rights with a point of diversion inside this area: 50 groundwater and 58 surface water, 95 of them active. The median priority date is 1975, and the oldest claim dates to 1892.

Types of right

  • Statement Of Claim53
  • Ground Water Certificate39
  • Provisional Permit14
  • Exempt Notice1
  • Water Reservation1

Purposes

  • Irrigation49
  • Domestic21
  • Stock8
  • Domestic; Stock7
  • Domestic; Lawn And Garden5

DNRC basins

  • 41K108

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 Sun Prairie 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.

  • Glacial Great Falls Lake Sediments43 wells · 65% · median 138 ft
  • Blackleaf Formation (of Colorado Group)7 wells · 11% · median 88 ft
  • Alluvium (quaternary)6 wells · 9% · median 199 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 Sun Prairie

Petroleum releases

2

0 open · 2 resolved

Superfund program sites

0

none on the National Priorities List

Registered tank facilities

1

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 1998. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.