Overview
EWG's drinking water quality report for Wyoming shows results of tests conducted by the water utilities in Wyoming and provided to EWG by the US EPA Region 8.
Large utilities in Wyoming
Below are utilities in Wyoming serving over 10,000 people, listed alphabetically.
| Utility | Location | People Served |
|---|
| Cheyenne Board Public Utilities | Cheyenne, WY | 64,165 |
| City of Casper | Casper, WY | 59,000 |
| City of Evanston | Evanston, WY | 12,000 |
| City of Gillette | Gillette, WY | 32,222 |
| City of Green River | Green River, WY | 10,500 |
| City of Laramie | Laramie, WY | 30,899 |
| City of Riverton | Riverton, WY | 10,330 |
| City of Rock Springs | Rock Springs, WY | 24,000 |
| City of Sheridan | Sheridan, WY | 22,700 |
| South Cheyenne Water and Sewer District | Cheyenne, WY | 10,000 |
Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Wyoming
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 |
|---|
Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Wyoming
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 |
|---|
Contaminants found in Wyoming above health guidelines
| Found above health guidelines | Found | |||
|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served |
| Total trihalomethanes (TTHMs) | 218 | 485,387 | 223 | 489,530 | ||
| Haloacetic acids (HAA5) | 196 | 469,759 | 202 | 481,070 | ||
| Bromodichloromethane | 187 | 456,164 | 192 | 461,016 | ||
| Chloroform | 142 | 433,654 | 190 | 456,293 | ||
| Bromochloroacetic acid | 145 | 431,126 | 145 | 431,126 | ||
| Dichloroacetic acid | 128 | 423,098 | 136 | 432,108 | ||
| Trichloroacetic acid | 114 | 389,697 | 122 | 424,472 | ||
| Dibromoacetic acid | 160 | 379,800 | 160 | 379,800 | ||
| Dibromochloromethane | 163 | 363,167 | 173 | 390,352 | ||
| Radium, combined (-226 & -228) | 147 | 326,188 | 155 | 331,094 | ||
| Haloacetic acids (HAA9) | 49 | 302,842 | 49 | 302,842 | ||
| Uranium, combined (pCi/L) | 118 | 284,234 | 155 | 347,242 | ||
| Nitrate & nitrite | 118 | 222,732 | 268 | 455,202 | ||
| Chromium (hexavalent) | 33 | 208,979 | 46 | 284,773 | ||
| Bromate | 23 | 137,521 | 23 | 137,521 | ||
| Nitrate | 33 | 125,665 | 48 | 166,275 | ||
| Arsenic | 60 | 101,000 | 60 | 101,000 | ||
| Bromoform | 49 | 67,260 | 126 | 304,757 | ||
| Perfluorohexane sulfonate (PFHXS) | 1 | 10,330 | 1 | 10,330 | ||
| Thallium | 5 | 3,901 | 17 | 80,753 | ||
| Chloromethane | 2 | 1,571 | 18 | 9,271 | ||
| Tetrachloroethylene (perchloroethylene) | 1 | 70 | 1 | 70 |
Contaminants found in Wyoming above legal limits
| Contaminant | # of Utilities | People Served |
|---|
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