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Montana water data · Zip Code in Petroleum County

ZIP 59087: well depth, groundwater and water rights

What the public record says about water in ZIP code 59087: 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 2,747 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

674

0.5 per sq mi

Median well depth

150 ft

half of wells 30–958 ft

Median static water level

39 ft

270 measurements

Median tested yield

10 gpm

398 pump tests

Well depth

How deep are wells in ZIP 59087?

Of 577 wells with a recorded total depth, the median is 150 feet. Half were drilled between 30 and 958 feet; one in ten went deeper than 1,521 feet and one in ten found water shallower than 18 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
30%
50–100 ft
8%
100–200 ft
20%
200–300 ft
9%
300–500 ft
3%
500 ft and deeper
30%

Static water level

39 ft

median depth to water at rest · half between 15 and 96 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

10 gpm

median tested yield · half between 5 and 20 gpm

23% of tested wells produced under 5 gallons per minute and 27% 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 ZIP 59087

34 wells have been completed here since 2016, 2 of them in the last twelve months. The newest log on file was completed November 11, 2025. Records run back to 1900.

What the wells are for

  • Stockwater330
  • Monitoring109
  • Domestic96
  • Industrial48
  • Waterflood48

How they were drilled

  • Rotary183
  • Forward Rotary44
  • Unknown30
  • Cable Tools27

Drillers filing well logs in ZIP 59087

  • Central Drilling Inc10 since 2016 · 2025
  • Gordon Drilling Inc4 since 2016 · 2017
  • Haz Tech Drilling Inc4 since 2016 · 2020
  • Vidic Drilling Inc3 since 2016 · 2021
  • Hole World Consulting Llc3 since 2016 · 2023
  • Olympus Technical Services3 since 2016 · 2019
  • Singley Drilling2 since 2016 · 2021
  • Montana Salinity Control Association71 all-time · 2009

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 ZIP 59087

Montana DNRC lists 2,055 water rights with a point of diversion inside this area: 418 groundwater and 1,637 surface water, 1,863 of them active. The median priority date is 1954, and the oldest claim dates to 1860.

Types of right

  • Statement Of Claim1,625
  • Ground Water Certificate198
  • Provisional Permit114
  • Stockwater Permit76
  • Compact21

Purposes

  • Stock1,365
  • Irrigation241
  • Wildlife237
  • Domestic43
  • Stock; Wildlife/waterfowl26

DNRC basins

  • 40B1,025
  • 40C978
  • 40EJ51
  • 40A1

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 ZIP 59087 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.

  • Eagle Sandstone96 wells · 39% · median 153 ft
  • Third Cat Creek Sandstone (basal Kootenai Fm)35 wells · 14% · median 1,450 ft
  • First Cat Creek Sandstone (base Of Colorado Gp)24 wells · 10% · median 1,319 ft
  • Alluvium (quaternary)18 wells · 7% · median 18 ft
  • Kootenai Formation14 wells · 6% · median 1,156 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 ZIP 59087

Petroleum releases

9

3 open · 6 resolved

Superfund program sites

0

none on the National Priorities List

Registered tank facilities

9

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.