Montana Water Quality
Health violation data for 809 community water systems in Montana. Based on EPA Safe Drinking Water Information System (SDWIS) data.
Water Systems
809
Total Violations
1,430
Systems with Violations
50
Cities with Issues
110
Water Systems with Most Violations
| # | Water System | Violations | Health |
|---|---|---|---|
| 1 | DENTON TOWN OF Denton | 155 | Yes |
| 2 | FORT BELKNAP AGENCY WATER SYSTEM Harlem | 125 | Yes |
| 3 | WHITEHALL TOWN OF Whitehall | 87 | Yes |
| 4 | HARLEM CITY OF Harlem | 68 | Yes |
| 5 | BEAVERHEAD JACKSON WATER AND SEWER DIST Jackson | 62 | Yes |
| 6 | ST LABRE INDIAN SCHOOL Ashland | 59 | Yes |
| 7 | CROW AGENCY WATER SYSTEM Crow Agency | 36 | Yes |
| 8 | KING RANCH COLONY Lewistown | 36 | Yes |
| 9 | NCMRWA TIBER SERVICE AREA Helena | 29 | Yes |
| 10 | CLARKS LOOKOUT Dillon | 26 | Yes |
| 11 | BLUE CLOUD SUBDIVISION Helena | 26 | Yes |
| 12 | PHILIPSBURG TOWN OF Philipsburg | 25 | Yes |
| 13 | RICHLAND CO VALLEY VIEW WUA Sidney | 25 | Yes |
| 14 | ARROW CREEK TRAILER COURT Fort Smith | 21 | Yes |
| 15 | BLUE SKY HEIGHTS WUA CLANCY Clancy | 20 | Yes |
| 16 | TURNER COLONY Turner | 20 | Yes |
| 17 | RIVERVIEW COLONY Chester | 20 | Yes |
| 18 | HYSHAM TOWN OF Hysham | 19 | Yes |
| 19 | BEE HIVE HOMES MSLA Missoula | 19 | Yes |
| 20 | TIBER COUNTY WATER DISTRICT Brady | 17 | Yes |
| 21 | CRYSTAL SPRINGS WATER SYSTEM Billings | 15 | Yes |
| 22 | PALISADES APARTMENTS Miles City | 13 | Yes |
| 23 | HELENA WATER SYSTEM Helena | 12 | Yes |
| 24 | LIBBY CITY OF Libby | 12 | Yes |
| 25 | ELK CREEK COLONY Augusta | 12 | Yes |
| 26 | BIRNEY VILLAGE Lame Deer | 11 | Yes |
| 27 | TAMARACK COURT Missoula | 11 | Yes |
| 28 | OILMONT COUNTY WATER DISTRICT Sunburst | 11 | Yes |
| 29 | PINNACLE ESTATES OF GLENDIVE Glendive | 11 | Yes |
| 30 | MILES CITY CITY OF Miles City | 10 | Yes |
| 31 | HAVRE CITY OF Havre | 10 | Yes |
| 32 | MILFORD COLONY INC Wolf Creek | 10 | Yes |
| 33 | WORDEN BALLANTINE YELLOWSTONE Fort Smith | 9 | Yes |
| 34 | FISHERMANS VILLAGE SUBDIVISION West Yellowstone | 9 | Yes |
| 35 | RYEGATE TOWN OF Ryegate | 8 | Yes |
| 36 | TWIN HILLS COLONY INC Carter | 8 | Yes |
| 37 | HEART BUTTE SCHOOL Heart Butte | 7 | Yes |
| 38 | SOUTH WIND WATER AND SEWER DISTRICT Great Falls | 7 | Yes |
| 39 | CHINOOK CITY OF Chinook | 7 | Yes |
| 40 | VIRGINIA CITY WATER DEPT Virginia City | 7 | Yes |
| 41 | FLAXVILLE TOWN OF Flaxville | 7 | Yes |
| 42 | PABLO LAKE COUNTY WATER AND SEWER DIST Pablo | 7 | Yes |
| 43 | LAME DEER WATER SYSTEM Lame Deer | 6 | Yes |
| 44 | COLSTRIP CITY OF Colstrip | 6 | Yes |
| 45 | MT ELLIS ACADEMY Bozeman | 6 | Yes |
| 46 | DUCK CREEK MOBILE HOME PARK Billings | 6 | Yes |
| 47 | FORT PECK RURAL COUNTY WATER DISTRICT Ft. Peck | 6 | Yes |
| 48 | BUSBY COMMUNITY WATER SYSTEM Lame Deer | 5 | Yes |
| 49 | COZY NORTHERN HOMES, LLC Livingston | 5 | Yes |
| 50 | GREAT FALLS CITY OF Great Falls | 5 | Yes |
Most Common Contaminants in Montana
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Total Trihalomethanes (TTHM) | 241 | 15 |
| Atrazine | 156 | 9 |
| Fluoride | 136 | 49 |
| Haloacetic Acids (HAA5) | 128 | 16 |
| Nitrite | 126 | 17 |
| E. coli | 125 | 65 |
| Barium | 116 | 10 |
| Lead (Action Level) | 104 | 2 |
| Chloroform | 85 | 2 |
| Arsenic | 82 | 22 |
| Combined Radium 226/228 | 57 | 39 |
| Lead & Copper Rule | 24 | 1 |
| Turbidity | 19 | 4 |
| Total Coliform (RTCR) | 13 | 11 |
| Manganese | 13 | 1 |
Cities with Water Quality Issues
Big Timber Laurel Billings Sidney Miles City Baker Colstrip Glendive Great Falls Shelby Helena Clancy East Helena Butte Belgrade Bozeman Anaconda Three Forks Whitehall Missoula Hamilton Kalispell Columbia Falls Eureka Browning Heart Butte Crow Agency Pablo Harlem Poplar Wolf Point Lame Deer Box Elder Livingston Lincoln Chester Basin Alberton Ashland Bainville +70 more
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Montana are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.