Marion County Water Quality

Marion County, Kentucky has a drinking-water quality grade of B with a score of 64.0/100, based on EPA SDWIS compliance data. The county has 1 health-based drinking water violation over the past 5 years. Watershed health, monitoring records, and live streamflow are reported separately on this page.

Marion County has 1 health-based drinking water violation 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 0.0% of Marion County's 1 assessed water bodies are classified as impaired (0 impaired). 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.

Marion County's SDWIS water quality score of 64.0/100 is lower than the Kentucky state average of 64.2. The average water quality grade across Kentucky is C, based on data from 118 counties with available SDWIS data.

Based on EPA SDWIS data, Marion County has a water quality grade of B (64.0/100). This indicates good to excellent water quality with strong SDWIS compliance. 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).

Marion County has 1 health-based drinking water violation according to EPA records. With a water quality score of 64.0/100 and grade B, 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.

Marion County ranks #67 out of 118 counties in Kentucky by SDWIS water quality score (1 = best). With a score of 64.0/100, it falls in the middle 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.