Ohio County Water Quality

Ohio County, Indiana has a drinking-water quality grade of F with a score of 32.4/100, based on EPA SDWIS compliance data. The county has 4 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and live streamflow are reported separately on this page.

Ohio County has 4 health-based drinking water violations recorded by the EPA over the past 5 years. 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.

EPA ATTAINS assessments under Clean Water Act §303(d) indicate 27.3% of Ohio County's 44 assessed water bodies are classified as impaired (12 impaired). The top reported causes are ESCHERICHIA COLI (E. COLI), MERCURY IN FISH TISSUE, BIOLOGICAL INTEGRITY. Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.

Ohio County's SDWIS water quality score of 32.4/100 is lower than the Indiana state average of 52.5. The average water quality grade across Indiana is D, based on data from 92 counties with available SDWIS data.

Based on EPA SDWIS data, Ohio County has a water quality grade of F (32.4/100). This indicates below-average compliance with significant violations. Residents may want to consider home water filtration or independent testing. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).

Ohio County has 4 health-based drinking water violations according to EPA records. With a water quality score of 32.4/100 and grade F, the county's drinking water has had some compliance issues but continues to be monitored. Note: drinking-water compliance speaks to the public water system, not necessarily to the watershed itself — check the Watershed Health zone for ATTAINS §303(d) data.

Ohio County ranks #73 out of 92 counties in Indiana by SDWIS water quality score (1 = best). With a score of 32.4/100, it falls in the bottom third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.