Connecticut Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Connecticut has 505 active community water systems in this extract. PlainEnviro's health-based slice lists 801 violation records across 50 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 505 community water systems in Connecticut. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | MEADOWS AT CROSS RIVER Bethel | 104 | Yes |
| 2 | PINECREST CONDOMINIUMS Berlin | 19 | Yes |
| 3 | 31 GRIST MILL RD Old Lyme | 18 | Yes |
| 4 | NORWICH PUBLIC UTILITIES Norwich | 18 | Yes |
| 5 | JUNIPER CLUB INC. Bloomfield | 16 | Yes |
| 6 | ROCK TERRACE TRAILER PARK Stamford | 16 | Yes |
| 7 | HUBBARD HILL APARTMENTS Canterbury | 14 | Yes |
| 8 | MARIANAPOLIS PREP SCHOOL - ST ALBERTS Thompson | 12 | Yes |
| 9 | FAWN RIDGE ASSOCIATION INC. East Woodstock | 11 | Yes |
| 10 | ORCHARD ACRES ASSOCIATION East Hartford | 10 | Yes |
| 11 | TOLLAND WATER DEPT - TORRY ROAD Tolland | 10 | Yes |
| 12 | ABENAKI WATER/WHITE ROCK WATER Monroe | 10 | Yes |
| 13 | ELMWOOD COURT, LLC Danbury | 9 | Yes |
| 14 | CONRADS PARK Brooklyn | 9 | Yes |
| 15 | Mashantucket Pequot Water System Mashantucket | 8 | Yes |
| 16 | LAKE LILLINONAH SHORES CONDOS Brookfield | 8 | Yes |
| 17 | TWIN HILLS WATER DISTRICT Bolton | 8 | Yes |
| 18 | KNOLLCREST TAX DISTRICT New Fairfield | 8 | Yes |
| 19 | WOODLAND SUMMIT COMMUNITY WATER ASSN Tolland | 8 | Yes |
| 20 | 39 HOP BROOK RD - APT COMPLEX Brookfield | 7 | Yes |
| 21 | SUNNY VALLEY TAX DISTRICT New Milford | 7 | Yes |
| 22 | CHELSEA FAMILY HOUSING West Hartford | 7 | Yes |
| 23 | BROOKFIELD HILLS CONDOMINIUM UNIT OWNERS Danbury | 6 | Yes |
| 24 | AQUARION-FALLS VILLAGE Shelton | 6 | Yes |
| 25 | CAMPBELL HEIGHTS APARTMENTS Norwich | 6 | Yes |
| 26 | YESHIVA OF WATERBURY-DURHAM CAMPUS Waterbury | 6 | Yes |
| 27 | LEDYARD WPCA - LEDYARD CENTER Ledyard | 6 | Yes |
| 28 | MOOSUP MANOR Dayville | 6 | Yes |
| 29 | QUINEBAUG MOBILE HOME PARK Quinebaug | 6 | Yes |
| 30 | ARROWHEAD BY THE LAKE ASSOCIATION, INC. Seymour | 6 | Yes |
| 31 | LINDHBROOK WATER COMPANY Harwinton | 6 | Yes |
| 32 | WOODLAWN APARTMENTS East Hartford | 5 | Yes |
| 33 | ORCHARD HILL ASSOCIATION Bloomfield | 5 | Yes |
| 34 | 298-302 ALBANY TURNPIKE Canton | 5 | Yes |
| 35 | CORNWALL WATER COMPANY Cornwall Bridge | 5 | Yes |
| 36 | CEDAR TERRACE PROP OWNERS ASSN Danbury | 5 | Yes |
| 37 | CTWC - WESTCHESTER EAST Clinton | 5 | Yes |
| 38 | HEBRON ARMS APARTMENTS Andover | 5 | Yes |
| 39 | LAKESIDE MANOR APARTMENTS Stamford | 5 | Yes |
| 40 | BOXWOOD CONDOMINIUM ASSOCIATION Jewett City | 5 | Yes |
| 41 | THOMPSON HILL WATER CO - PAULA LANE DIV Thompson | 5 | Yes |
| 42 | VOLUNTOWN HOUSING AUTHORITY Voluntown | 5 | Yes |
| 43 | RIDGEVIEW HEIGHTS East Hartford | 5 | Yes |
| 44 | DEER PARK APARTMENTS East Hartford | 5 | Yes |
| 45 | WACCABUC FARMS INC. Westport | 5 | Yes |
| 46 | CHELSEA ELDERLY HOUSING West Hartford | 5 | Yes |
| 47 | BIRCH LANDING CONDOMINIUM Manchester | 5 | Yes |
| 48 | MAR-LEA PARK APARTMENTS East Hartford | 4 | Yes |
| 49 | CHESTELM HEALTH & REHABILITATION CENTER Moodus | 4 | Yes |
| 50 | EAST WINDSOR HOUSING AUTHORITY Broad Brook | 4 | Yes |
Most Common Contaminants in Connecticut
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Revised Total Coliform Rule | 207 | 66 |
| Lead and Copper Rule | 124 | 76 |
| LEAD AND COPPER RULE REVISIONS | 122 | 122 |
| PERFLUOROCTANE SULFONIC ACID (PFOS) | 59 | 2 |
| Chloride | 46 | 1 |
| Coliform (TCR) | 44 | 15 |
| Arsenic | 43 | 6 |
| Groundwater Rule | 39 | 22 |
| TTHM | 37 | 6 |
| Surface Water Treatment Rule | 20 | 11 |
| PERFLUOROCTANOIC ACID (PFOA) | 15 | 2 |
| Combined Radium (-226 and -228) | 12 | 4 |
| Total Haloacetic Acids (HAA5) | 5 | 3 |
| Di(2-ethylhexyl) phthalate | 4 | 2 |
| Antimony, Total | 4 | 1 |
Cities with Water Quality Issues
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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 Connecticut are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.