Thurston County Water Quality

Thurston County, Washington has a water quality grade of C with a score of 50.8/100, based on EPA Safe Drinking Water Information System data. The county has 55 health-based drinking water violations on record.

Thurston County has 55 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.

Thurston County's water quality score of 50.8/100 is lower than the Washington state average of 59.3. The average water quality grade across Washington is D, based on data from 39 counties with available water quality data.

Based on EPA data, Thurston County has a water quality grade of C (50.8/100). 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).

Thurston County has 55 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.

Thurston County ranks #29 out of 39 counties in Washington by water quality score (1 = best). With a score of 50.8/100, 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.