Idaho
743 Utilities
Serving: 1,328,000
Data available: 2014-2019
Contaminants Found: 59
EWG's drinking water quality report for Idaho shows results of tests conducted by the water utilities in Idaho and provided to EWG by the Idaho Department of Environmental Quality.
Below are utilities in Idaho serving over 10,000 people, listed alphabetically.
Large utilities in Idaho
| Utility | Location | People Served |
|---|---|---|
| Burley Water Department | Burley, ID | 10,345 |
| City of Ammon | Ammon, ID | 14,019 |
| City of Blackfoot | Blackfoot, ID | 11,584 |
| City of Caldwell | Caldwell, ID | 50,204 |
| City of Chubbuck | Chubbuck, ID | 14,125 |
| City of Coeur D Alene | Coeur D Alene, ID | 44,426 |
| City of Idaho Falls | Idaho Falls, ID | 61,500 |
| City of Jerome | Jerome, ID | 10,890 |
| City of Kuna | Kuna, ID | 22,830 |
| City of Lewiston | Lewiston, ID | 15,001 |
| City of Mountain Home | Mountain Home, ID | 14,000 |
| City of Nampa | Nampa, ID | 81,557 |
| City of Pocatello | Pocatello, ID | 56,266 |
| City of Post Falls | Post Falls, ID | 17,422 |
| City of Rexburg | Rexburg, ID | 27,300 |
| City of Twin Falls | Twin Falls, ID | 48,260 |
| Eagle Water Company Inc | Eagle, ID | 10,250 |
| Falls Water Company Inc | Portland, ID | 17,100 |
| Garden City Water and Sewer System | Garden City, ID | 12,500 |
| Lewiston Orchards Irrigation District | Lewiston, ID | 20,000 |
| Meridian Water Department | Meridian, ID | 114,680 |
| Moscow Water Department | Moscow, ID | 24,499 |
| Suez | Boise, ID | 228,790 |
Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Idaho
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 Idaho
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 |
|---|---|---|---|
| City of Mountain Home | Mountain Home, ID | 14,000 | 7 |
| City of Caldwell | Caldwell, ID | 50,204 | 6 |
| Suez | Boise, ID | 228,790 | 5 |
| Moscow Water Department | Moscow, ID | 24,499 | 2 |
| City of Twin Falls | Twin Falls, ID | 48,260 | 2 |
| Eagle Water Company Inc | Eagle, ID | 10,250 | 1 |
| City of Jerome | Jerome, ID | 10,890 | 1 |
| Garden City Water and Sewer System | Garden City, ID | 12,500 | 1 |
| Lewiston Orchards Irrigation District | Lewiston, ID | 20,000 | 1 |
| City of Rexburg | Rexburg, ID | 27,300 | 1 |
| City of Pocatello | Pocatello, ID | 56,266 | 1 |
Contaminants found in Idaho above health guidelines
| Found above health guidelines | Found | ||||||
|---|---|---|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served | |||
Nitrate | 529 | 1,030,618 | 579 | 1,082,424 | |||
Radium, combined (-226 & -228) | 411 | 1,020,747 | 421 | 1,024,641 | |||
Arsenic | 398 | 988,278 | 398 | 988,278 | |||
Uranium | 404 | 959,129 | 450 | 1,014,095 | |||
Chromium (hexavalent) | 26 | 867,816 | 28 | 912,315 | |||
Total trihalomethanes (TTHMs) | 195 | 818,052 | 201 | 855,431 | |||
Haloacetic acids (HAA5) | 143 | 746,457 | 144 | 760,457 | |||
Haloacetic acids (HAA9) | 16 | 648,561 | 22 | 805,224 | |||
Nitrate and nitrite | 369 | 627,621 | 386 | 653,770 | |||
Bromodichloromethane | 18 | 310,870 | 18 | 310,870 | |||
Dibromochloromethane | 15 | 310,018 | 15 | 310,018 | |||
Chloroform | 17 | 249,863 | 18 | 251,163 | |||
Tetrachloroethylene (perchloroethylene) | 7 | 247,803 | 8 | 304,069 | |||
Dibromoacetic acid | 5 | 59,747 | 5 | 59,747 | |||
Bromoform | 5 | 59,747 | 10 | 309,722 | |||
Vanadium | 1 | 48,260 | 26 | 867,816 | |||
Manganese | 5 | 17,465 | 37 | 886,622 | |||
Cadmium | 3 | 15,871 | 3 | 15,871 | |||
Trichloroethylene | 1 | 9,000 | 7 | 347,283 | |||
Dichloroacetic acid | 7 | 2,522 | 7 | 2,522 | |||
Trichloroacetic acid | 5 | 2,257 | 5 | 2,257 | |||
Di(2-ethylhexyl) phthalate | 3 | 275 | 22 | 30,876 | |||
Thallium | 1 | 92 | 1 | 92 | |||
Contaminants found in Idaho above legal limits
| Contaminant | # of Utilities | People Served | |
|---|---|---|---|
Arsenic | 10 | 5,470 | |
Uranium | 2 | 298 | |
Fluoride | 1 | 78 | |
Di(2-ethylhexyl) phthalate | 1 | 65 |