Ontario County Water Quality

Ontario County, New York has a water quality grade of F with a score of 29.0/100, based on EPA Safe Drinking Water Information System data. The county has 64 health-based drinking water violations on record.

Ontario County has 64 health-based drinking water violations recorded by the EPA. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.

Ontario County's water quality score of 29.0/100 is lower than the New York state average of 40.1. The average water quality grade across New York is D, based on data from 57 counties with available water quality data.

Based on EPA data, Ontario County has a water quality grade of F (29.0/100). This indicates below-average water quality with significant compliance issues. Residents may want to consider home water filtration. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).

Ontario County has 64 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.

Ontario County ranks #40 out of 57 counties in New York by water quality score (1 = best). With a score of 29.0/100, it falls in the bottom third of counties statewide. Rankings are based on EPA Safe Drinking Water Information System (SDWIS) data including health-based violations and compliance records.