All water systems in Montana
2,352 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Montana State Hospital Complex Warm Springs · Deer Lodge County |
721 | 5 | 1 | |
|
Fairfield Town of Fairfield · Teton County |
718 | 0 | 0 | |
|
Hardin Westbound Rest Area Hardin · Big Horn County |
715 | 2 | 0 | |
|
North Star Pud Helena · Lewis and Clark County |
715 | 2 | 0 | |
|
Culbertson Town of Culbertson · Roosevelt County |
714 | 0 | 0 | |
|
Travois Village Mobile Park Missoula · Missoula County |
702 | 1 | 0 | |
|
Lost Trail Rest Area Sula · Ravalli County |
701 | 1 | 0 | |
|
Easthaven Baptist Church Whitefish · Flathead County |
700 | 0 | 0 | |
|
Frenchtown Elementary School Dist 40 Frenchtown · Missoula County |
700 | 1 | 0 | |
|
Gardiner Park CO Water Dist Gardiner · Park County |
700 | 0 | 0 | |
|
ST Ignatius Town of St Ignatius · Lake County |
700 | 4 | 1 | |
|
ST Mary KOA County |
700 | 1 | 0 | |
|
Lost Trail Powder Mtn Sula Conner · Ravalli County |
690 | 2 | 0 | |
|
Woods Bay Water and Sewer District Bigfork · Lake County |
685 | 0 | 0 | |
|
Elk Grove Water Bozeman · Gallatin County |
672 | 0 | 0 | |
|
Genesis Business Park Bozeman · Gallatin County |
670 | 2 | 2 | |
|
Fort Peck Rural County Water District Fort Peck · Valley County |
663 | 0 | 0 | |
|
Target Range Main School Missoula · Missoula County |
660 | 1 | 0 | |
|
Cascade Town of Cascade · Cascade County |
650 | 1 | 0 | |
|
Hillside Village Billings · Yellowstone County |
650 | 3 | 1 | |
|
Hope Church Kalispell · Flathead County |
650 | 0 | 0 | |
|
Many Glacier Lodge Hotel Babb · Glacier County |
650 | 0 | 0 | |
|
ST Labre Indian School Ashland · Rosebud County |
650 | 3 | 0 | |
|
West Valley School District NO 1 Kalispell · Flathead County |
650 | 0 | 0 | |
|
Bedrockbabb Water System County |
645 | 3 | 0 | |
|
Circle Town of Circle · McCone County |
644 | 3 | 0 | |
|
Sheridan Town of Sheridan · Madison County |
632 | 5 | 0 | |
|
Stillwater Mining Company Nye · Stillwater County |
630 | 1 | 0 | |
|
Nevada City Helena · Madison County |
621 | 2 | 0 | |
|
Greenfield Mobile Home Park Missoula · Missoula County |
620 | 0 | 0 | |
|
Lewis and Clark Caverns Visitor Center Cardwell · Jefferson County |
615 | 0 | 0 | |
|
Lolo Super Stop Missoula · Missoula County |
615 | 0 | 0 | |
|
Big Sandy Town of Big Sandy · Chouteau County |
608 | 2 | 0 | |
|
Belt Town of Belt · Cascade County |
600 | 2 | 0 | |
|
Big Timber KOA Big Timber · Sweet Grass County |
600 | 1 | 0 | |
|
Blackfeet Community Hospital County |
600 | 3 | 1 | |
|
Cherry Creek Estates LLC Billings · Yellowstone County |
600 | 2 | 1 | |
|
Countryside Village MHP Grt Fls Great Falls · Cascade County |
600 | 0 | 0 | |
|
East Bound Hathaway Rest Area Forsyth · Rosebud County |
600 | 0 | 0 | |
|
Elder Grove Middle School Bldg 6 Billings · Yellowstone County |
600 | 2 | 1 | |
|
Jefferson City South Rest Stop Jefferson City · Jefferson County |
600 | 2 | 0 | |
|
Joliet Town of Joliet · Carbon County |
600 | 1 | 1 | |
|
Lone Pine Store Hamilton · Ravalli County |
600 | 0 | 0 | |
|
Medicine Lake Town of Medicine Lake · Sheridan County |
600 | 0 | 0 | |
|
Ptarmigan Village INC Whitefish · Flathead County |
600 | 1 | 0 | |
|
Stokes Market Florence Florence · Ravalli County |
600 | 2 | 1 | |
|
Town Pump Travel Plaza Glendive Glendive · Dawson County |
600 | 3 | 1 | |
|
Travel Centers of America Truck Plaza Laurel · Yellowstone County |
600 | 0 | 0 | |
|
Two Medicine Ranger Station West Glacier · Glacier County |
600 | 0 | 0 | |
|
WB Hathaway Rest Area Forsyth · Rosebud County |
600 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Montana records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.