Montana county well data
Williams County well depths
We analyzed 4 well records with recorded depths in Williams County from the Montana Ground Water Information Center. The median well is 263.5 feet deep, and most fall between 176.8 and 458 feet.
- 4
- Well records analyzed
- 4
- With recorded depth
- 263.5 ft
- Median depth
- 176.8–458 ft
- Typical range (25th–75th)
- 158.3–670.4 ft
- 10th–90th percentile
- 146 ft
- Shallowest recorded
- 812 ft
- Deepest recorded
- 18 GPM
- Median reported yield
What these numbers mean if you are buying here
A county median is a useful orientation, not a prediction for a specific property. Well depth in Montana is driven by local geology and topographic position, and both change over short distances — particularly at the edges of the intermontane basins, where unconsolidated basin fill gives way to bedrock. Two parcels a mile apart in Williams County can require very different wells.
The spread here shows that directly. While the median is 263.5 feet, recorded depths run from 146 to 812 feet. That range is why our property reports select comparable wells around the specific parcel and weight them by geology rather than quoting a county average.
The median reported yield in Williams County is 18 GPM. Bear in mind these are short drilling-test measurements taken at completion, not sustained-capacity tests, so treat them as an indication of what drillers encountered rather than a guarantee of long-term supply.
Static water level — the depth at which water stands before pumping — has a median of 173.5 feet across 2 records in the county. This affects pump setting and operating cost.
Check a specific property
County statistics are context. A property report analyzes the wells around one parcel.
Compare counties
- Ravalli70 ft · 22,201 wells
- Flathead190 ft · 21,817 wells
- Gallatin80 ft · 19,848 wells
- Lewis And Clark103 ft · 17,204 wells
- Yellowstone35 ft · 15,109 wells
- Missoula100 ft · 15,295 wells
- Lincoln140 ft · 8,434 wells
- Lake180 ft · 8,061 wells
Source: Montana Bureau of Mines and Geology, Ground Water Information Center (GWIC) and Montana Department of Natural Resources and Conservation (DNRC), Water Rights Bureau. Statistics computed September 26, 2026. Abandoned, plugged, and destroyed wells are excluded, as are depths outside a plausible range. See methodology.