State rankings
Connecticut water-system rankings
Lowest-scoring systems in Connecticut
Ranked lowest score first. Population shown for context.
1 PUTNAM WATER POLLUTION CONTROL AUTHORITY PUTNAM, CT · ~7,300 served 37 2 AVON WATER CO CLINTON, CT · ~11,590 served 40 3 CTWC - CRYSTAL SYSTEM CLINTON, CT · ~6,378 served 42 4 CTWC - NORTHERN REG-WESTERN SYSTEM CLINTON, CT · ~101,313 served 47 5 HAZARDVILLE WATER COMPANY ENFIELD, CT · ~18,544 served 48 6 MANCHESTER WATER DEPARTMENT MANCHESTER, CT · ~51,198 served 53 7 NORWICH PUBLIC UTILITIES NORWICH, CT · ~36,163 served 55 8 AQUARION-WOODRICH VILLAGE SHELTON, CT · ~72 served 56 9 MERIDEN WATER DIVISION MERIDEN, CT · ~58,441 served 57 10 WALLINGFORD WATER DEPARTMENT WALLINGFORD, CT · ~37,267 served 57 11 NORWALK FIRST TAXING DISTRICT NORWALK, CT · ~40,256 served 58 12 CTWC - SHORELINE REGION-GUILFORD SYSTEM CLINTON, CT · ~33,975 served 59 13 CTWC - UNIONVILLE SYSTEM CLINTON, CT · ~14,693 served 59 14 EAST LYME WATER & SEWER COMMISSION NIANTIC, CT · ~15,245 served 60 15 FREEDOM VILLAGE ELDERLY HOUSING UNCASVILLE, CT · ~43 served 60 16 31 GRIST MILL RD OLD LYME, CT · ~30 served 60 17 AQUARION-RIDGEFIELD SHELTON, CT · ~7,476 served 65 18 AQUARION-NEWTOWN REGIONAL SHELTON, CT · ~6,054 served 65 19 AQUARION-PLAINVILLE REGIONAL SHELTON, CT · ~18,231 served 66 20 AQUARION-EASTERN FAIRFIELD COUNTY SHELTON, CT · ~351,756 served 67 21 COLCHESTER SEWER & WATER COMMISSION COLCHESTER, CT · ~4,020 served 67 22 DEER PARK APARTMENTS EAST HARTFORD, CT · ~125 served 70 23 LAKESIDE MANOR APARTMENTS STAMFORD, CT · ~72 served 70 24 LITTLE BROOK RD PROPERTY OWNERS ASSN NEW HARTFORD, CT · ~64 served 70 25 CONRADS PARK BROOKLYN, CT · ~60 served 70
Highest-scoring large systems in Connecticut
Systems serving 10,000+ people with the best scores.
1 METROPOLITAN DISTRICT COMMISSION HARTFORD, CT · ~390,887 served 100 2 WATERBURY WATER DEPARTMENT WATERBURY, CT · ~107,271 served 100 3 NEW BRITAIN WATER DEPARTMENT NEW BRITAIN, CT · ~73,534 served 100 4 SOUTH NORWALK ELECTRIC & WATER WILTON, CT · ~42,000 served 100 5 MIDDLETOWN WATER DEPARTMENT MIDDLETOWN, CT · ~41,019 served 100 6 TORRINGTON WATER COMPANY SHELTON, CT · ~37,915 served 100 7 Mohegan Tribal Utility Authority Uncasville, CT · ~31,961 served 100 8 GROTON UTILITIES GROTON, CT · ~30,200 served 100
Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.