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Montana water data · Community in Gallatin County

Sedan: well depth, groundwater and water rights

What the public record says about water in Sedan: 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 533 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (place boundary)

Wells on record

82

1.3 per sq mi

Median well depth

129 ft

half of wells 81–205 ft

Median static water level

27 ft

74 measurements

Median tested yield

20 gpm

71 pump tests

Well depth

How deep are wells in Sedan?

Of 78 wells with a recorded total depth, the median is 129 feet. Half were drilled between 81 and 205 feet; one in ten went deeper than 275 feet and one in ten found water shallower than 50 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
8%
50–100 ft
27%
100–200 ft
37%
200–300 ft
19%
300–500 ft
9%
500 ft and deeper
0%

Static water level

27 ft

median depth to water at rest · half between 11 and 48 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 12 and 30 gpm

11% of tested wells produced under 5 gallons per minute and 58% 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 Sedan

12 wells have been completed here since 2016. The newest log on file was completed September 20, 2022. Records run back to 1900.

What the wells are for

  • Domestic69
  • Stockwater12
  • Irrigation9
  • Public Water Supply3
  • Monitoring1

How they were drilled

  • Rotary61
  • Forward Rotary3
  • Cable3
  • Unknown2

Drillers filing well logs in Sedan

  • Red Tiger Drilling4 since 2016 · 2022
  • Potts Drilling Inc2 since 2016 · 2021
  • Hayes Drilling2 since 2016 · 2020
  • Van Dyken Drilling Inc19 all-time · 2015
  • Hillman Drilling8 all-time · 2007
  • Haggerty Drilling3 all-time · 1994

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 Sedan

Montana DNRC lists 448 water rights with a point of diversion inside this area: 161 groundwater and 287 surface water, 428 of them active. The median priority date is 1909, and the oldest claim dates to 1877.

Types of right

  • Statement Of Claim361
  • Ground Water Certificate75
  • Provisional Permit8
  • Water Reservation3
  • Stockwater Permit1

Purposes

  • Irrigation178
  • Stock177
  • Domestic39
  • Domestic; Stock7
  • Domestic; Lawn And Garden7

DNRC basins

  • 43A442
  • 41I4
  • 41H2

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 Sedan 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.

  • Sedan Formation (upper Cretaceous)33 wells · 50% · median 140 ft
  • Billman Creek Formation (of Livingston Group)27 wells · 41% · median 85 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 Sedan

Petroleum releases

2

0 open · 2 resolved

Superfund program sites

0

none on the National Priorities List

Registered tank facilities

1

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 2000. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.