All water systems in Montana
2,352 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Deer Lodge City of Deer Lodge · Powell County |
2,900 | 0 | 0 | |
|
Glacier Park International Airport Kalispell · Flathead County |
2,680 | 0 | 0 | |
|
Lame Deer Water System County |
2,605 | 4 | 2 | |
|
Fort Belknap Agency Water System County |
2,600 | 3 | 0 | |
|
Lehrkinds Big Spring Water Lewistown · Fergus County |
2,575 | 2 | 0 | |
|
Montana Expo Park Cascade County Great Falls · Cascade County |
2,510 | 1 | 0 | |
|
Conrad Water Dept Conrad · Pondera County |
2,500 | 0 | 0 | |
|
Greycliff Rest Area Eastbound Greycliff · Sweet Grass County |
2,500 | 2 | 0 | |
|
Ronan City of Ronan · Lake County |
2,483 | 3 | 0 | |
|
Town Pump Bonner 1 Milltown · Missoula County |
2,478 | 2 | 0 | |
|
Wheat Montana Bakery Bozeman · Broadwater County |
2,453 | 2 | 1 | |
|
Big Mountain Water Company Whitefish · Flathead County |
2,435 | 1 | 0 | |
|
Colstrip City of Colstrip · Rosebud County |
2,350 | 2 | 0 | |
|
Rae Water and Sewer Dist 313 Bozeman · Gallatin County |
2,325 | 1 | 0 | |
|
Forsyth City of Forsyth · Rosebud County |
2,260 | 0 | 0 | |
|
Pablo Lake County Water and Sewer Dist Pablo · Lake County |
2,175 | 2 | 0 | |
|
East Helena City of Helena · Lewis and Clark County |
2,114 | 1 | 0 | |
|
Gallatin Speedway Bozeman · Gallatin County |
2,100 | 1 | 0 | |
|
Montana State Prison Deer Lodge · Powell County |
2,100 | 8 | 1 | |
|
Troy City of Troy · Lincoln County |
2,100 | 0 | 0 | |
|
Stevensville Town of Stevensville · Ravalli County |
2,090 | 2 | 0 | |
|
Crow Agency Water System County |
2,057 | 7 | 2 | |
|
Little Bighorn Battlefield NM Crow Agency · Big Horn County |
2,020 | 0 | 0 | |
|
Red Lodge Mtn Main Lodge Red Lodge · Carbon County |
2,006 | 1 | 0 | |
|
Clearwater Junction Rest Area Missoula · Missoula County |
2,002 | 0 | 0 | |
|
Bearmouth Rest Stop Eastbound Drummond · Granite County |
2,000 | 1 | 0 | |
|
Bearmouth Rest Stop Westbound Drummond · Granite County |
2,000 | 1 | 0 | |
|
Dena Mora Saltese West Rest Saltese · Mineral County |
2,000 | 3 | 0 | |
|
Eastgate Village Sewer and Water East Helena · Lewis and Clark County |
2,000 | 1 | 0 | |
|
Red Lodge Water Dept Red Lodge · Carbon County |
2,000 | 0 | 0 | |
|
Rocky Boy's Rural Water County |
2,000 | 2 | 0 | |
|
Townsend City of Townsend · Broadwater County |
2,000 | 1 | 0 | |
|
Eureka Town of Eureka · Lincoln County |
1,995 | 0 | 0 | |
|
Fairmont Hot Springs Resort Anaconda · Silver Bow County |
1,965 | 0 | 0 | |
|
Thompson Falls City of Thompson Falls · Sanders County |
1,950 | 0 | 0 | |
|
Msu Northern Havre · Hill County |
1,937 | 1 | 0 | |
|
Town Pump Three Forks 1 Three Forks · Broadwater County |
1,921 | 1 | 0 | |
|
Columbus Town of Columbus · Stillwater County |
1,900 | 0 | 0 | |
|
Roundup Water Department Roundup · Musselshell County |
1,900 | 1 | 0 | |
|
Three Forks City of Three Forks · Gallatin County |
1,900 | 0 | 0 | |
|
Baker City of Baker · Fallon County |
1,858 | 3 | 0 | |
|
Malta City of Malta · Phillips County |
1,800 | 3 | 0 | |
|
Manhattan Town of Manhattan · Gallatin County |
1,800 | 0 | 0 | |
|
Sun Prairie Village County Great Falls · Cascade County |
1,800 | 1 | 0 | |
|
Super One Food Store Stevensville · Ravalli County |
1,769 | 1 | 1 | |
|
Assiniboine & Sioux Rural Water System County |
1,726 | 1 | 0 | |
|
Hill County Water Districts Havre · Hill County |
1,720 | 0 | 0 | |
|
Plains Town of Plains · Sanders County |
1,700 | 1 | 0 | |
|
Plentywood Water Department Plentywood · Sheridan County |
1,700 | 0 | 0 | |
|
Choteau City of Choteau · Teton County |
1,691 | 1 | 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.