Connecticut Water Quality Rankings

Connecticut water quality overview

Connecticut's drinking water quality is fair overall, with a state average score of 60.8 out of 100 — 13.7 points below the national average of 74.5. The median city score is 59, reflecting how water quality is distributed across the state's 129 ranked cities. 42% of cities scored a D or F, pointing to significant water quality challenges across much of the state. 40 cities did earn an A or B grade, showing that strong systems do exist. PFAS "forever chemicals" were detected in 86 of 129 cities (67%). Of those, 79 cities exceed the 2024 EPA maximum contaminant levels — a health concern requiring action. 2 cities have lead levels exceeding the EPA action level of 15 ppb, typically a sign of aging lead service lines or lead solder in older plumbing. Residents in these areas should use an NSF 53-certified filter. 105 cities have recorded health-based violations with the EPA — meaning contaminant levels exceeded safe limits or required testing was missed. Use the table below to find your city's specific record.