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Montana water data · Town in Madison County

Ennis: well depth, groundwater and water rights

What the public record says about water in Ennis: 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 238 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder, US Census (place boundary)

Wells on record

108

146.3 per sq mi

Median well depth

49 ft

half of wells 30–80 ft

Median static water level

13 ft

91 measurements

Median tested yield

30 gpm

80 pump tests

Well depth

How deep are wells in Ennis?

Of 101 wells with a recorded total depth, the median is 49 feet. Half were drilled between 30 and 80 feet; one in ten went deeper than 118 feet and one in ten found water shallower than 14 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
51%
50–100 ft
36%
100–200 ft
11%
200–300 ft
1%
300–500 ft
1%
500 ft and deeper
0%

Static water level

13 ft

median depth to water at rest · half between 10 and 22 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

30 gpm

median tested yield · half between 20 and 46 gpm

0% of tested wells produced under 5 gallons per minute and 84% 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 Ennis

7 wells have been completed here since 2016. The newest log on file was completed September 18, 2025. Records run back to 1897.

What the wells are for

  • Domestic49
  • Irrigation35
  • Monitoring19
  • Public Water Supply5
  • Stockwater4

How they were drilled

  • Rotary33
  • Hollowstem Auger10
  • Cable9
  • Churn5

Drillers filing well logs in Ennis

  • Pioneer Technical Services Inc3 since 2016 · 2025
  • Graham Drilling Inc2 since 2016 · 2020
  • Haz Tech Drilling Inc2 since 2016 · 2018
  • Madison Drilling & Pump Supply13 all-time · 2005
  • Van Dyken Drilling Inc7 all-time · 1997
  • Morelock4 all-time · 1992
  • Big Sky3 all-time · 1999

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 Ennis

Montana DNRC lists 92 water rights with a point of diversion inside this area: 82 groundwater and 10 surface water, 86 of them active. The median priority date is 1990, and the oldest claim dates to 1867.

Types of right

  • Ground Water Certificate61
  • Statement Of Claim24
  • Water Reservation3
  • Exempt Notice3
  • Provisional Permit1

Purposes

  • Lawn And Garden30
  • Domestic27
  • Irrigation11
  • Domestic; Lawn And Garden5
  • Fish And Wildlife3

DNRC basins

  • 41F92

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 Ennis 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.

  • Cenozoic Undifferentiated25 wells · 74% · median 63 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 Ennis

Petroleum releases

20

5 open · 15 resolved

Superfund program sites

1

none on the National Priorities List

Registered tank facilities

17

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 2019. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.