Groundwater Rule (GWR) violations in Montana
45 active public water systems in Montana had a Groundwater Rule (GWR) violation in the past three years, 18 of them in the latest quarter of EPA's data. What Groundwater Rule (GWR) is and why it matters.
Systems with a Groundwater Rule (GWR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Crow Agency Water System County |
2,057 | 7 | 2 | |
|
ST Ignatius Town of St Ignatius · Lake County |
700 | 4 | 1 | |
|
Pryor Water System County |
406 | 7 | 1 | |
|
Hidden Lake Yellowstone County W and S D Billings · Yellowstone County |
350 | 1 | 0 | |
|
Best Burger Drive in Bozeman · Gallatin County |
310 | 2 | 1 | |
|
Lame Deer High School County |
291 | 5 | 2 | |
|
Wyola Water System County |
281 | 10 | 1 | |
|
Anderson School Bozeman · Gallatin County |
220 | 7 | 1 | |
|
Elk Meadows Ranchettes Frenchtown · Missoula County |
175 | 1 | 1 | |
|
Hoving Business Center Helena · Lewis and Clark County |
170 | 5 | 1 | |
|
Uncle Joes Oasis Bar and Grill Wolf Creek · Lewis and Clark County |
102 | 4 | 3 | |
|
River Grove Estates TR CT Billings · Yellowstone County |
100 | 1 | 1 | |
|
S&k Electronics County |
80 | 3 | 1 | |
|
Arrow Creek Trailer Court Billings · Yellowstone County |
75 | 3 | 0 | |
|
Blackfeet Dorm. Water System County |
66 | 2 | 1 | |
|
Fin's Tap House Corvallis · Ravalli County |
35 | 2 | 1 | |
|
Sfe Hamilton · Ravalli County |
35 | 1 | 1 | |
|
East View Acres Water System Missoula · Missoula County |
25 | 2 | 1 | |
|
Virginia City Water Dept Virginia City · Madison County |
1,500 | 3 | 0 | |
|
Thriftway Super Stop #8 Bozeman Bozeman · Gallatin County |
817 | 1 | 0 | |
|
Peak Health and Wellness Center Missoula · Missoula County |
506 | 2 | 1 | |
|
Warren School District NO 1 Helena · Lewis and Clark County |
350 | 1 | 0 | |
|
Ryegate Town of Ryegate · Golden Valley County |
270 | 3 | 0 | |
|
Geraldine Town of Geraldine · Chouteau County |
260 | 1 | 0 | |
|
Canyon Creek School District 4 Billings · Yellowstone County |
200 | 1 | 0 | |
|
Eagle Mount Bozeman · Gallatin County |
161 | 2 | 0 | |
|
Garden Center Subdivision Owners Assoc Bozeman · Gallatin County |
150 | 2 | 0 | |
|
Abundant Life Church Bozeman · Gallatin County |
125 | 2 | 0 | |
|
Whitewater Inn Gallatin Gateway · Gallatin County |
125 | 2 | 0 | |
|
Lubrecht Experimental Forest Greenough · Missoula County |
121 | 1 | 0 | |
|
Bee Hive Homes Msla Missoula · Missoula County |
106 | 1 | 0 | |
|
Seven Gables Resort Anaconda · Deer Lodge County |
100 | 3 | 0 | |
|
Lewis and Clark Campground Dillon · Beaverhead County |
90 | 1 | 0 | |
|
H Bar J Saloon and Cafe Wise River · Beaverhead County |
75 | 2 | 0 | |
|
Tamarack Court Missoula · Missoula County |
75 | 1 | 0 | |
|
Camp Child Elliston · Powell County |
72 | 3 | 1 | |
|
Milford Colony INC Wolf Creek · Lewis and Clark County |
67 | 7 | 0 | |
|
Pacific Steel and Recycling Billings · Yellowstone County |
60 | 1 | 0 | |
|
Bitterroot Health Corvallis Hamilton · Ravalli County |
54 | 1 | 0 | |
|
Flying Pig Saloon Victor · Ravalli County |
52 | 1 | 0 | |
|
Cinnamon Lodge and Adventures Big Sky · Gallatin County |
40 | 2 | 0 | |
|
Pine Butte Choteau · Teton County |
35 | 2 | 0 | |
|
Wild Coyote Saloon Thompson Falls · Sanders County |
31 | 2 | 0 | |
|
East Decker Coal Mine Decker · Big Horn County |
28 | 2 | 0 | |
|
Plains Alliance Church Plains · Sanders County |
27 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Groundwater Rule (GWR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Groundwater Rule (GWR) alone.
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.