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Montana water data · Zip Code in Sweet Grass County

ZIP 59055: well depth, groundwater and water rights

What the public record says about water in ZIP code 59055: 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 1,026 public records from MBMG GWIC, Montana DNRC, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

171

0.8 per sq mi

Median well depth

97 ft

half of wells 50–168 ft

Median static water level

25 ft

159 measurements

Median tested yield

19 gpm

158 pump tests

Well depth

How deep are wells in ZIP 59055?

Of 165 wells with a recorded total depth, the median is 97 feet. Half were drilled between 50 and 168 feet; one in ten went deeper than 286 feet and one in ten found water shallower than 29 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
23%
50–100 ft
27%
100–200 ft
29%
200–300 ft
12%
300–500 ft
7%
500 ft and deeper
2%

Static water level

25 ft

median depth to water at rest · half between 11 and 60 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

19 gpm

median tested yield · half between 11 and 35 gpm

9% of tested wells produced under 5 gallons per minute and 50% 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 59055

12 wells have been completed here since 2016, 2 of them in the last twelve months. The newest log on file was completed August 27, 2026. Records run back to 1900.

What the wells are for

  • Stockwater126
  • Domestic78
  • Irrigation11

How they were drilled

  • Rotary76
  • Cable31
  • Drill6
  • Churn Drill4

Drillers filing well logs in ZIP 59055

  • Birchell Drilling5 since 2016 · 2021
  • Outlaw Drilling & Pump, Llc3 since 2016 · 2026
  • Aaqua Drilling Inc1 since 2016 · 2026
  • I & I Drilling11 all-time · 1978
  • Unknown11 all-time · 1961
  • Red Tiger Drilling7 all-time · 2015
  • Hayes Drilling6 all-time · 2000
  • Buckley6 all-time · 1953

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 59055

Montana DNRC lists 854 water rights with a point of diversion inside this area: 460 groundwater and 394 surface water, 809 of them active. The median priority date is 1919, and the oldest claim dates to 1878.

Types of right

  • Statement Of Claim771
  • Ground Water Certificate68
  • Provisional Permit8
  • Exempt Notice4
  • Stockwater Permit2

Purposes

  • Stock654
  • Irrigation129
  • Domestic46
  • Unknown3
  • Domestic; Lawn And Garden3

DNRC basins

  • 43BV551
  • 40A299
  • 43B2
  • 43Q2

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 59055 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.

  • Fort Union Formation47 wells · 77% · median 100 ft
  • Tongue River Member (of Ft Union Fm.)8 wells · 13% · median 112 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 59055

Petroleum releases

0

0 open · 0 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. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.