Montana
753 Utilities
Serving: 734,000
Data available: 2014-2019
Contaminants Found: 65
EWG's drinking water quality report for Montana shows results of tests conducted by the water utilities in Montana and provided to EWG by the Montana Department of Environmental Quality.
Below are utilities in Montana serving over 10,000 people, listed alphabetically.
Large utilities in Montana
Utility | Location | People Served |
---|---|---|
Butte-Silver Bow Water Department | Butte, MT | 33,000 |
City of Billings | Billings, MT | 114,000 |
City of Bozeman | Bozeman, MT | 32,000 |
City of Great Falls | Great Falls, MT | 60,000 |
Co Water District of Billings Heights | Billings, MT | 12,000 |
Helena Water System | Helena, MT | 31,005 |
Kalispell Public Works | Kalispell, MT | 20,008 |
Mountain Water Company | Missoula, MT | 68,200 |
Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Montana
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Montana
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
Utility | Location | People Served | Violation Points |
---|---|---|---|
Helena Water System | Helena, MT | 31,005 | 1 |
Contaminants found in Montana above health guidelines
Found above health guidelines | Found | ||||||
---|---|---|---|---|---|---|---|
Contaminant | # of Utilities | People Served | # of Utilities | People Served | |||
Total trihalomethanes (TTHMs) | 273 | 594,854 | 273 | 595,529 | |||
Bromodichloromethane | 231 | 580,032 | 230 | 580,007 | |||
Nitrate and nitrite | 540 | 558,524 | 689 | 718,202 | |||
Haloacetic acids (HAA5) | 237 | 557,937 | 237 | 577,920 | |||
Bromochloroacetic acid | 192 | 533,306 | 191 | 533,281 | |||
Dibromoacetic acid | 195 | 474,136 | 195 | 474,166 | |||
Chloroform | 214 | 467,843 | 235 | 569,491 | |||
Arsenic | 282 | 460,448 | 274 | 457,821 | |||
Dibromochloromethane | 206 | 459,740 | 208 | 484,941 | |||
Dichloroacetic acid | 192 | 458,530 | 192 | 460,455 | |||
Trichloroacetic acid | 161 | 434,291 | 161 | 434,966 | |||
Haloacetic acids (HAA9) | 40 | 381,555 | 39 | 381,362 | |||
Radium, combined (-226 & -228) | 424 | 356,302 | 464 | 452,088 | |||
Chromium (hexavalent) | 36 | 356,015 | 42 | 396,575 | |||
Uranium | 381 | 352,266 | 394 | 395,251 | |||
Nitrate | 121 | 185,659 | 154 | 190,803 | |||
Bromoform | 71 | 49,930 | 103 | 151,884 | |||
Cadmium | 2 | 31,045 | 2 | 31,045 | |||
Chlorate | 1 | 20,008 | 9 | 187,743 | |||
Barium | 2 | 2,655 | 289 | 398,837 | |||
Thallium | 2 | 1,984 | 4 | 2,117 | |||
Manganese | 5 | 1,242 | 85 | 424,336 | |||
Di(2-ethylhexyl) phthalate | 1 | 650 | 18 | 13,408 | |||
Radon | 1 | 300 | 1 | 300 | |||
Benzene | 1 | 225 | 1 | 225 | |||
Antimony | 2 | 138 | 3 | 8,673 | |||
Beryllium | 1 | 40 | 3 | 420 |
Contaminants found in Montana above legal limits
Contaminant | # of Utilities | People Served | |
---|---|---|---|
Uranium | 1 | 1,100 | |
Total trihalomethanes (TTHMs) | 2 | 895 | |
Arsenic | 6 | 729 | |
Di(2-ethylhexyl) phthalate | 1 | 650 | |
Haloacetic acids (HAA5) | 3 | 408 | |
Nitrate and nitrite | 1 | 84 | |
Radium, combined (-226 & -228) | 1 | 58 |