Montana water data · County
Toole County: well depth, groundwater and water rights
What the public record says about water in Toole County: 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 4,277 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder
Wells on record
876
800 with recorded depth
Median well depth
38 ft
half of wells 20–111 ft
Median static water level
22 ft
414 measurements
Median tested yield
10 gpm
410 pump tests
Well depth
How deep are wells in Toole County?
Of 800 wells with a recorded total depth, the median is 38 feet. Half were drilled between 20 and 111 feet; one in ten went deeper than 210 feet and one in ten found water shallower than 15 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.
Static water level
22 ft
median depth to water at rest · half between 12 and 70 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 4 and 35 gpm
28% of tested wells produced under 5 gallons per minute and 36% 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 Toole County
74 wells have been completed here since 2016, 14 of them in the last twelve months. The newest log on file was completed August 27, 2026. Records run back to 1902.
What the wells are for
- Monitoring341
- Stockwater324
- Domestic192
- Irrigation54
- Public Water Supply42
How they were drilled
- Solid Stem Auger89
- Rotary81
- Cable28
- Direct Push24
Drillers filing well logs in Toole County
- Olympus Technical Services20 since 2016 · 2024
- Montana Salinity Control Association19 since 2016 · 2024
- Boland Drilling7 since 2016 · 2025
- Cascade Drilling6 since 2016 · 2026
- Cascade Drilling Lp6 since 2016 · 2025
- Aquasource Drilling Llc4 since 2016 · 2026
- Pioneer Technical Services Inc4 since 2016 · 2022
- West Central Environmental Consultants3 since 2016 · 2023
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 Toole County
Montana DNRC lists 3,240 water rights in the county: 703 groundwater and 2,537 surface water, 2,984 of them active. The median priority date is 1936, and the oldest claim dates to 1880.
Types of right
- Statement Of Claim2,914
- Provisional Permit157
- Ground Water Certificate116
- Stockwater Permit45
- Exempt Notice6
Purposes
- Stock2,267
- Irrigation499
- Domestic160
- Multiple Domestic77
- Fish And Wildlife36
DNRC basins
- 41N1,282
- 41P1,021
- 40F937
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 Toole County 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.
- Virgelle Sandstone Member (of Eagle Sandstone)30 wells · 27% · median 143 ft
- Eagle Sandstone22 wells · 20% · median 250 ft
- Alluvium (quaternary)21 wells · 19% · median 41 ft
- Two Medicine Formation (of Montana Group)13 wells · 12% · median 130 ft
- Glacial Drift12 wells · 11% · median 27 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 Toole County
Petroleum releases
61
14 open · 47 resolved
Superfund program sites
0
none on the National Priorities List
Registered tank facilities
100
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 2022. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.