The state of Montana keeps a log of every well ever drilled. We read all 273,047 of them.
Montana well logs, made useful.
Every well log filed with GWIC — depth, static
water level, tested yield, and the driller's original report — brought together around one
address, instead of one record at a time.
✓ Verified against GWIC · 2026-08-17
100 ftmedian well depth statewide
33 ftmedian static water level
20 gpmmedian well yield
38,508wells drilled since 2016
What you can answer here
- How deep will my well need to be? Median and range of actual drilled depths near you — not national averages.
- What will it cost? Local median depth × published per-foot rates, with the math shown.
- Will it produce enough water? Yields from pump tests on nearby wells.
- Who drills around here? The drillers who actually filed recent well logs in your county.
These are GWIC records Every figure here comes from Montana Bureau of Mines and Geology Ground Water Information Center (GWIC) — the state's official well-log repository.
We index those same records by location so you can start from an address, and every well
links back to its original filed log.
What's in a Montana well log →
· About GWIC →
Well data by county
Beaverhead County
4,941 wells · median 78 ft Big Horn County
3,648 wells · median 68 ft Blaine County
1,842 wells · median 77 ft Broadwater County
3,949 wells · median 141 ft Carbon County
6,465 wells · median 58 ft Carter County
1,583 wells · median 160 ft Cascade County
7,171 wells · median 110 ft Chouteau County
2,448 wells · median 39 ft Custer County
3,226 wells · median 180 ft Daniels County
1,476 wells · median 55 ft Dawson County
3,888 wells · median 90 ft Deer Lodge County
2,587 wells · median 60 ft Fallon County
1,842 wells · median 180 ft Fergus County
3,761 wells · median 127 ft Flathead County
21,965 wells · median 191 ft Gallatin County
19,739 wells · median 80 ft Garfield County
2,239 wells · median 180 ft Glacier County
1,403 wells · median 95 ft Golden Valley County
986 wells · median 100 ft Granite County
2,399 wells · median 80 ft Hill County
3,289 wells · median 90 ft Jefferson County
5,309 wells · median 181 ft Judith Basin County
1,584 wells · median 100 ft Lake County
8,092 wells · median 180 ft Lewis and Clark County
17,146 wells · median 105 ft Liberty County
1,072 wells · median 38 ft Lincoln County
8,143 wells · median 145 ft Madison County
6,631 wells · median 100 ft Mccone County
1,883 wells · median 118 ft Meagher County
1,268 wells · median 110 ft Mineral County
1,687 wells · median 122 ft Missoula County
15,571 wells · median 100 ft Musselshell County
3,628 wells · median 177 ft Park County
6,566 wells · median 108 ft Petroleum County
777 wells · median 160 ft Phillips County
2,426 wells · median 75 ft Pondera County
1,391 wells · median 35 ft Powder River County
3,931 wells · median 168 ft Powell County
2,442 wells · median 85 ft Prairie County
1,733 wells · median 148 ft Ravalli County
21,937 wells · median 75 ft Richland County
5,004 wells · median 80 ft Roosevelt County
3,950 wells · median 60 ft Rosebud County
4,296 wells · median 100 ft Sanders County
4,901 wells · median 165 ft Sheridan County
2,395 wells · median 99 ft Silver Bow County
4,344 wells · median 95 ft Stillwater County
5,851 wells · median 60 ft Sweet Grass County
2,329 wells · median 85 ft Teton County
3,031 wells · median 30 ft Toole County
843 wells · median 38 ft Treasure County
924 wells · median 80 ft Valley County
3,117 wells · median 68 ft Wheatland County
1,081 wells · median 100 ft Wibaux County
1,384 wells · median 130 ft Yellowstone County
15,379 wells · median 35 ft Research: homes on well water near documented fuel leaks We mapped Montana's household wells against the EPA's database of leaking underground fuel tanks — county-by-county results, methodology, and a free data download.
Read the analysis →