Montana water data · Community in Lake County
Rollins: well depth, groundwater and water rights
What the public record says about water in Rollins: 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 308 public records from MBMG GWIC, Montana DNRC, EPA UST Finder, US Census (place boundary)
Wells on record
97
33.8 per sq mi
Median well depth
260 ft
half of wells 176–401 ft
Median static water level
60 ft
89 measurements
Median tested yield
21 gpm
96 pump tests
Well depth
How deep are wells in Rollins?
Of 95 wells with a recorded total depth, the median is 260 feet. Half were drilled between 176 and 401 feet; one in ten went deeper than 558 feet and one in ten found water shallower than 129 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
60 ft
median depth to water at rest · half between 33 and 118 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
21 gpm
median tested yield · half between 15 and 31 gpm
3% of tested wells produced under 5 gallons per minute and 63% 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 Rollins
20 wells have been completed here since 2016, 4 of them in the last twelve months. The newest log on file was completed June 30, 2026. Records run back to 1954.
What the wells are for
- Domestic93
- Irrigation9
- Stockwater5
- Public Water Supply2
- Geothermal-injection1
How they were drilled
- Rotary64
- Forward Rotary14
- Air Rotary9
- Dual Rotary2
Drillers filing well logs in Rollins
- Allwest Drilling Inc4 since 2016 · 2024
- Billmayer Drilling3 since 2016 · 2026
- Glazier Drilling3 since 2016 · 2025
- Oh Well Drilling And Pump3 since 2016 · 2026
- Chambers Drilling Company1 since 2016 · 2025
- Liberty Drilling & Pump Co13 all-time · 1995
- Castlio Drilling10 all-time · 2003
- Western Water Works Inc7 all-time · 2004
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 Rollins
Montana DNRC lists 210 water rights with a point of diversion inside this area: 91 groundwater and 119 surface water, 194 of them active. The median priority date is 1977, and the oldest claim dates to 1893.
Types of right
- Statement Of Claim95
- Ground Water Certificate66
- Provisional Permit44
- Exempt Notice5
Purposes
- Domestic76
- Multiple Domestic33
- Domestic; Lawn And Garden22
- Lawn And Garden21
- Irrigation18
DNRC basins
- 76LJ210
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 Rollins 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.
- Middle Belt Carbonate30 wells · 60% · median 215 ft
- Belt Supergroup10 wells · 20% · median 208 ft
- Ravalli Group7 wells · 14% · median 330 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 Rollins
Petroleum releases
0
0 open · 0 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. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.