Pima County Water Quality

Pima County, Arizona has a water quality grade of C with a score of 53.4/100, based on EPA Safe Drinking Water Information System data. The county has 128 health-based drinking water violations on record.

Pima County has 128 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.

Pima County's water quality score of 53.4/100 is higher than the Arizona state average of 28.6. The average water quality grade across Arizona is F, based on data from 15 counties with available water quality data.

Based on EPA data, Pima County has a water quality grade of C (53.4/100). 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).

Pima County has 128 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.

Pima County ranks #2 out of 15 counties in Arizona by water quality score (1 = best). With a score of 53.4/100, it falls in the top third of counties statewide. Rankings are based on EPA Safe Drinking Water Information System (SDWIS) data including health-based violations and compliance records.