Winnebago County Water Quality

Winnebago County, Illinois has a water quality grade of C with a score of 57.1/100, based on EPA Safe Drinking Water Information System data. The county has 21 health-based drinking water violations on record.

Winnebago County has 21 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.

Winnebago County's water quality score of 57.1/100 is higher than the Illinois state average of 47.8. The average water quality grade across Illinois is D, based on data from 102 counties with available water quality data.

Based on EPA data, Winnebago County has a water quality grade of C (57.1/100). This indicates moderate water quality. Some violations have been recorded but overall compliance is maintained. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).

Winnebago County has 21 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.

Winnebago County ranks #37 out of 102 counties in Illinois by water quality score (1 = best). With a score of 57.1/100, it falls in the middle third of counties statewide. Rankings are based on EPA Safe Drinking Water Information System (SDWIS) data including health-based violations and compliance records.