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Montana water data · Zip Code in Jefferson County

ZIP 59721: well depth, groundwater and water rights

What the public record says about water in ZIP code 59721: 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 1,381 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

494

2.4 per sq mi

Median well depth

100 ft

half of wells 63–180 ft

Median static water level

30 ft

432 measurements

Median tested yield

20 gpm

411 pump tests

Well depth

How deep are wells in ZIP 59721?

Of 467 wells with a recorded total depth, the median is 100 feet. Half were drilled between 63 and 180 feet; one in ten went deeper than 340 feet and one in ten found water shallower than 39 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
16%
50–100 ft
30%
100–200 ft
31%
200–300 ft
10%
300–500 ft
7%
500 ft and deeper
5%

Static water level

30 ft

median depth to water at rest · half between 12 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

20 gpm

median tested yield · half between 10 and 35 gpm

10% of tested wells produced under 5 gallons per minute and 59% 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 59721

97 wells have been completed here since 2016, 6 of them in the last twelve months. The newest log on file was completed July 24, 2026. Records run back to 1899.

What the wells are for

  • Domestic336
  • Stockwater105
  • Monitoring55
  • Irrigation20
  • Industrial7

How they were drilled

  • Rotary213
  • Cable69
  • Air Rotary24
  • Dual Rotary22

Drillers filing well logs in ZIP 59721

  • Red Tiger Drilling38 since 2016 · 2026
  • Graham Drilling Inc12 since 2016 · 2020
  • Okeefe Drilling Co11 since 2016 · 2025
  • Western Water Wells9 since 2016 · 2021
  • Lindsay Drilling Co Inc6 since 2016 · 2022
  • Van Dyken Drilling Inc3 since 2016 · 2022
  • A-10 Drilling3 since 2016 · 2025
  • Ak Drilling Inc.3 since 2016 · 2026

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 59721

Montana DNRC lists 874 water rights with a point of diversion inside this area: 454 groundwater and 420 surface water, 811 of them active. The median priority date is 1923, and the oldest claim dates to 1858.

Types of right

  • Statement Of Claim560
  • Ground Water Certificate272
  • Exempt Notice20
  • Provisional Permit9
  • Stockwater Permit8

Purposes

  • Stock294
  • Irrigation281
  • Domestic127
  • Domestic; Lawn And Garden39
  • Domestic; Stock21

DNRC basins

  • 41G770
  • 41E104

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 59721 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)20 wells · 19% · median 125 ft
  • Cenozoic Undifferentiated19 wells · 18% · median 40 ft
  • Alluvium (quaternary)15 wells · 14% · median 29 ft
  • Upper Cretaceous Undifferentiated10 wells · 10% · median 140 ft
  • Bozeman Group6 wells · 6% · median 65 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 59721

Petroleum releases

5

2 open · 3 resolved

Superfund program sites

0

none on the National Priorities List

Registered tank facilities

8

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 2020. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.