Overview
EWG's drinking water quality report for Connecticut shows results of tests conducted by the water utilities in Connecticut and provided to EWG by the Connecticut Department of Public Health.
Large utilities in Connecticut
Below are utilities in Connecticut serving over 10,000 people, listed alphabetically.
| Utility | Location | People Served |
|---|
Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Connecticut
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 Connecticut
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 |
|---|
| Southington Water Department | Southington, CT | 43,069 | 3 |
| Valley Water Systems, Inc. | Plainville, CT | 18,231 | 2 |
| Wallingford Water Department | Wallingford, CT | 37,267 | 2 |
| Aquarion Water Company of Connecticut - Main System | Bridgeport, CT | 351,756 | 2 |
| Avon Water Company | Avon, CT | 11,590 | 1 |
| Aquarion Water Company of Connecticut - Greenwich System | Greenwich, CT | 53,297 | 1 |
| New Britain Water Department | New Britain, CT | 73,534 | 1 |
Contaminants found in Connecticut above health guidelines
| Found above health guidelines | Found | |||
|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served |
| Total trihalomethanes (TTHMs) | 244 | 2,688,100 | 246 | 2,688,197 | ||
| Haloacetic acids (HAA5) | 219 | 2,680,521 | 220 | 2,681,221 | ||
| Bromodichloromethane | 238 | 2,678,712 | 241 | 2,681,275 | ||
| Chloroform | 192 | 2,644,347 | 241 | 2,678,327 | ||
| Haloacetic acids (HAA9) | 70 | 2,514,144 | 70 | 2,514,144 | ||
| Dichloroacetic acid | 166 | 2,363,128 | 179 | 2,376,010 | ||
| Trichloroacetic acid | 127 | 2,272,934 | 133 | 2,326,954 | ||
| Dibromochloromethane | 224 | 2,044,797 | 238 | 2,568,111 | ||
| Chromium (hexavalent) | 57 | 1,746,768 | 72 | 2,516,395 | ||
| Nitrate | 302 | 1,576,213 | 460 | 2,686,486 | ||
| Nitrate & nitrite | 299 | 1,569,102 | 460 | 2,686,877 | ||
| Dibromoacetic acid | 133 | 1,416,166 | 151 | 2,142,821 | ||
| Perfluorooctanoic acid (PFOA) | 31 | 1,390,504 | 31 | 1,390,504 | ||
| Perfluorooctane sulfonate (PFOS) | 33 | 1,319,691 | 36 | 1,439,484 | ||
| Radium, combined (-226 & -228) | 228 | 1,068,091 | 234 | 1,069,172 | ||
| Arsenic | 63 | 274,622 | 63 | 274,622 | ||
| Perfluorohexane sulfonate (PFHXS) | 13 | 266,441 | 13 | 266,441 | ||
| Strontium-90 | 5 | 126,753 | 19 | 196,556 | ||
| Cadmium | 4 | 120,121 | 4 | 120,121 | ||
| 1,2,3-Trichloropropane | 3 | 119,793 | 6 | 185,744 | ||
| Uranium, combined (pCi/L) | 170 | 86,214 | 232 | 897,429 | ||
| Chlorate | 10 | 84,239 | 68 | 2,466,457 | ||
| Chlorite | 3 | 81,811 | 3 | 81,811 | ||
| Bromoform | 41 | 74,796 | 155 | 1,156,974 | ||
| Tetrachloroethylene (perchloroethylene) | 3 | 24,505 | 3 | 24,505 | ||
| Toxaphene | 1 | 21,214 | 1 | 21,214 | ||
| Manganese | 7 | 19,758 | 117 | 2,546,931 | ||
| 4,8-dioxa-3H-perfluorononanoic acid (ADONA) | 1 | 14,691 | 1 | 14,691 | ||
| Radon | 2 | 2,837 | 2 | 2,837 | ||
| Bromochloroacetic acid | 3 | 1,254 | 3 | 1,254 | ||
| Antimony | 1 | 144 | 3 | 940 |
