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Montana water data · City in Beaverhead County

Dillon: well depth, groundwater and water rights

What the public record says about water in Dillon: 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 425 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder, US Census (place boundary)

Wells on record

209

110.1 per sq mi

Median well depth

37 ft

half of wells 25–60 ft

Median static water level

12 ft

160 measurements

Median tested yield

20 gpm

161 pump tests

Well depth

How deep are wells in Dillon?

Of 194 wells with a recorded total depth, the median is 37 feet. Half were drilled between 25 and 60 feet; one in ten went deeper than 104 feet and one in ten found water shallower than 17 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
63%
50–100 ft
23%
100–200 ft
8%
200–300 ft
4%
300–500 ft
1%
500 ft and deeper
0%

Static water level

12 ft

median depth to water at rest · half between 8 and 18 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 15 and 35 gpm

2% of tested wells produced under 5 gallons per minute and 67% 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 Dillon

10 wells have been completed here since 2016. The newest log on file was completed July 8, 2020. Records run back to 1879.

What the wells are for

  • Domestic122
  • Monitoring35
  • Irrigation26
  • Stockwater12
  • Public Water Supply11

How they were drilled

  • Cable57
  • Rotary25
  • Churn Drill21
  • Auger12

Drillers filing well logs in Dillon

  • Okeefe Drilling Co7 since 2016 · 2020
  • Graham Drilling Inc2 since 2016 · 2018
  • Lindsay Drilling Co Inc1 since 2016 · 2020
  • C. Hollensteiner14 all-time · 1971
  • Briggs Drilling10 all-time · 1974
  • U.s. Bureau Of Reclamation9 all-time · 1965
  • Aqua9 all-time · 1986
  • Dept Of Transportation6 all-time · 2003

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 Dillon

Montana DNRC lists 134 water rights with a point of diversion inside this area: 119 groundwater and 15 surface water, 125 of them active. The median priority date is 1986, and the oldest claim dates to 1864.

Types of right

  • Ground Water Certificate81
  • Statement Of Claim36
  • Exempt Notice14
  • Provisional Permit3

Purposes

  • Domestic48
  • Lawn And Garden22
  • Domestic; Lawn And Garden19
  • Irrigation17
  • Commercial9

DNRC basins

  • 41B134

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 Dillon 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.

  • Alluvium (holocene)116 wells · 89% · median 35 ft
  • Alluvium (pleistocene)7 wells · 5% · median 153 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 Dillon

Petroleum releases

46

2 open · 44 resolved

Superfund program sites

1

none on the National Priorities List

Registered tank facilities

35

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 2021. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.