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Montana water data · Community in Park County

South Glastonbury: well depth, groundwater and water rights

What the public record says about water in South Glastonbury: 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 580 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (place boundary)

Wells on record

267

15.3 per sq mi

Median well depth

180 ft

half of wells 80–325 ft

Median static water level

52 ft

232 measurements

Median tested yield

20 gpm

255 pump tests

Well depth

How deep are wells in South Glastonbury?

Of 260 wells with a recorded total depth, the median is 180 feet. Half were drilled between 80 and 325 feet; one in ten went deeper than 501 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
9%
50–100 ft
20%
100–200 ft
24%
200–300 ft
17%
300–500 ft
20%
500 ft and deeper
10%

Static water level

52 ft

median depth to water at rest · half between 28 and 107 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 11 and 35 gpm

11% of tested wells produced under 5 gallons per minute and 55% 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 South Glastonbury

36 wells have been completed here since 2016, 1 of them in the last twelve months. The newest log on file was completed April 28, 2026. Records run back to 1900.

What the wells are for

  • Domestic242
  • Stockwater11
  • Irrigation9
  • Fire Protection4
  • Monitoring3

How they were drilled

  • Rotary178
  • Foward Rotary44
  • Cable15
  • Dual Rotary4

Drillers filing well logs in South Glastonbury

  • Hayes Drilling13 since 2016 · 2024
  • Red Tiger Drilling13 since 2016 · 2025
  • Potts Drilling Inc4 since 2016 · 2025
  • Van Dyken Drilling Inc3 since 2016 · 2026
  • Bridger Drilling Inc1 since 2016 · 2016
  • Rock Creek Drilling Inc63 all-time · 2006
  • Hillman Drilling33 all-time · 2008
  • Aaqua Drilling Inc8 all-time · 1996

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 South Glastonbury

Montana DNRC lists 307 water rights with a point of diversion inside this area: 214 groundwater and 93 surface water, 280 of them active. The median priority date is 1991, and the oldest claim dates to 1869.

Types of right

  • Ground Water Certificate190
  • Statement Of Claim107
  • Conservation District Record5
  • Exempt Notice2
  • Provisional Permit2

Purposes

  • Domestic78
  • Irrigation61
  • Domestic; Lawn And Garden53
  • Stock46
  • Domestic; Stock9

DNRC basins

  • 43B307

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 South Glastonbury 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.

  • Absaroka Volcanics (eocene)102 wells · 41% · median 315 ft
  • Glacial Drift54 wells · 22% · median 134 ft
  • Alluvium (holocene)43 wells · 17% · median 50 ft
  • Sediments (tertiary)26 wells · 11% · median 223 ft
  • Alluvium (quaternary)18 wells · 7% · median 90 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 South Glastonbury

Petroleum releases

2

0 open · 2 resolved

Superfund program sites

0

none on the National Priorities List

Registered tank facilities

4

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 1991. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.