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Montana water data · Zip Code in Granite County

ZIP 59858: well depth, groundwater and water rights

What the public record says about water in ZIP code 59858: 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 2,707 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

944

1.1 per sq mi

Median well depth

100 ft

half of wells 45–260 ft

Median static water level

37 ft

783 measurements

Median tested yield

20 gpm

798 pump tests

Well depth

How deep are wells in ZIP 59858?

Of 929 wells with a recorded total depth, the median is 100 feet. Half were drilled between 45 and 260 feet; one in ten went deeper than 452 feet and one in ten found water shallower than 22 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
26%
50–100 ft
22%
100–200 ft
21%
200–300 ft
9%
300–500 ft
13%
500 ft and deeper
9%

Static water level

37 ft

median depth to water at rest · half between 16 and 114 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 10 and 25 gpm

5% of tested wells produced under 5 gallons per minute and 52% 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 59858

318 wells have been completed here since 2016, 27 of them in the last twelve months. The newest log on file was completed August 18, 2026. Records run back to 1873.

What the wells are for

  • Domestic731
  • Stockwater82
  • Other81
  • Monitoring39
  • Public Water Supply18

How they were drilled

  • Rotary383
  • Dual Rotary105
  • Sonic92
  • Cable54

Drillers filing well logs in ZIP 59858

  • Okeefe Drilling Co169 since 2016 · 2026
  • Jeromes Drilling Co57 since 2016 · 2024
  • Ak Drilling Inc41 since 2016 · 2026
  • Ak Drilling, Inc.11 since 2016 · 2022
  • Heimark Drilling7 since 2016 · 2026
  • Parsons Drilling6 since 2016 · 2019
  • Western Water Wells6 since 2016 · 2023
  • Lindsay Drilling Co Inc5 since 2016 · 2021

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 59858

Montana DNRC lists 1,738 water rights with a point of diversion inside this area: 788 groundwater and 950 surface water, 1,534 of them active. The median priority date is 1938, and the oldest claim dates to 1858.

Types of right

  • Statement Of Claim1,146
  • Ground Water Certificate523
  • Provisional Permit42
  • Exempt Notice10
  • Compact7

Purposes

  • Stock533
  • Irrigation383
  • Domestic323
  • Domestic; Lawn And Garden99
  • Mining91

DNRC basins

  • 76E859
  • 76GJ854
  • 76G25

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 59858 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.

  • Sediments (tertiary)99 wells · 20% · median 141 ft
  • Sand And Gravel (pleistocene)95 wells · 19% · median 45 ft
  • Sand And Gravel (holocene)83 wells · 17% · median 38 ft
  • Belt Supergroup52 wells · 10% · median 205 ft
  • Missoula Group38 wells · 8% · median 220 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 59858

Petroleum releases

4

0 open · 4 resolved

Superfund program sites

3

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 2005. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.