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Montana water data · Community in Ravalli County

Corvallis: well depth, groundwater and water rights

What the public record says about water in Corvallis: 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 567 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (place boundary)

Wells on record

303

525.5 per sq mi

Median well depth

40 ft

half of wells 38–41 ft

Median static water level

12 ft

285 measurements

Median tested yield

35 gpm

288 pump tests

Well depth

How deep are wells in Corvallis?

Of 289 wells with a recorded total depth, the median is 40 feet. Half were drilled between 38 and 41 feet; one in ten went deeper than 50 feet and one in ten found water shallower than 30 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
90%
50–100 ft
9%
100–200 ft
1%
200–300 ft
0%
300–500 ft
0%
500 ft and deeper
0%

Static water level

12 ft

median depth to water at rest · half between 9 and 16 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

35 gpm

median tested yield · half between 20 and 60 gpm

2% of tested wells produced under 5 gallons per minute and 82% 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 Corvallis

56 wells have been completed here since 2016, 1 of them in the last twelve months. The newest log on file was completed April 21, 2026. Records run back to 1893.

What the wells are for

  • Domestic265
  • Irrigation29
  • Public Water Supply12
  • Monitoring9
  • Stockwater3

How they were drilled

  • Rotary179
  • Cable31
  • Forward Rotary23
  • Hollowstem Auger5

Drillers filing well logs in Corvallis

  • Aqwa Drilling Llc37 since 2016 · 2023
  • Eslinger Drilling & Pump Service10 since 2016 · 2026
  • Ravalli Drilling Inc5 since 2016 · 2021
  • Eagle Drilling And Pump Service3 since 2016 · 2024
  • Advanced Well Drilling Inc19 all-time · 2010
  • Martin Well Drilling18 all-time · 2002
  • Preston Drilling13 all-time · 1991
  • Ravalli Drilling9 all-time · 2010

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 Corvallis

Montana DNRC lists 257 water rights with a point of diversion inside this area: 254 groundwater and 3 surface water, 243 of them active. The median priority date is 2004, and the oldest claim dates to 1866.

Types of right

  • Ground Water Certificate222
  • Exempt Notice18
  • Statement Of Claim12
  • Provisional Permit5

Purposes

  • Domestic118
  • Domestic; Lawn And Garden67
  • Commercial18
  • Multiple Domestic9
  • Lawn And Garden; Domestic8

DNRC basins

  • 76H257

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 Corvallis 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.

  • Terrace Deposits (pleistocene)29 wells · 60% · median 40 ft
  • Alluvium (holocene)14 wells · 29% · median 39 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 Corvallis

Petroleum releases

4

0 open · 4 resolved

Superfund program sites

0

none on the National Priorities List

Registered tank facilities

3

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 1997. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.