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Montana water data · City in Fergus County

Lewistown: well depth, groundwater and water rights

What the public record says about water in Lewistown: 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 355 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder, US Census (place boundary)

Wells on record

135

23.6 per sq mi

Median well depth

80 ft

half of wells 45–148 ft

Median static water level

22 ft

90 measurements

Median tested yield

17 gpm

78 pump tests

Well depth

How deep are wells in Lewistown?

Of 111 wells with a recorded total depth, the median is 80 feet. Half were drilled between 45 and 148 feet; one in ten went deeper than 260 feet and one in ten found water shallower than 20 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
29%
50–100 ft
30%
100–200 ft
24%
200–300 ft
8%
300–500 ft
5%
500 ft and deeper
4%

Static water level

22 ft

median depth to water at rest · half between 12 and 44 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

17 gpm

median tested yield · half between 10 and 30 gpm

5% of tested wells produced under 5 gallons per minute and 49% 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 Lewistown

8 wells have been completed here since 2016. The newest log on file was completed April 5, 2023. Records run back to 1910.

What the wells are for

  • Domestic62
  • Monitoring52
  • Irrigation13
  • Stockwater9
  • Industrial2

How they were drilled

  • Rotary41
  • Forward Rotary17
  • Excavator12
  • Cable11

Drillers filing well logs in Lewistown

  • Olympus Technical Services7 since 2016 · 2022
  • Singley Drilling1 since 2016 · 2023
  • Debuff Drilling11 all-time · 1996
  • Haz Tech Drilling Inc10 all-time · 2015
  • Central Drilling Inc9 all-time · 2015
  • Jennings Drilling Co9 all-time · 1991
  • Ntl Engineering & Geoscience6 all-time · 2009
  • Four Star Drilling6 all-time · 1997

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 Lewistown

Montana DNRC lists 114 water rights with a point of diversion inside this area: 76 groundwater and 38 surface water, 105 of them active. The median priority date is 1979, and the oldest claim dates to 1881.

Types of right

  • Ground Water Certificate59
  • Statement Of Claim44
  • Provisional Permit4
  • Irrigation District3
  • Exempt Notice3

Purposes

  • Domestic34
  • Irrigation20
  • Stock13
  • Commercial8
  • Lawn And Garden6

DNRC basins

  • 41S114

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 Lewistown 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.

  • Kootenai Formation5 wells · 56% · median 135 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 Lewistown

Petroleum releases

49

4 open · 45 resolved

Superfund program sites

1

none on the National Priorities List

Registered tank facilities

56

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.