CLERMONT COUNTY, Ohio — The Clermont County water system is among more than 20 public water systems across Ohio flagged by the state for apparent monitoring violations — meaning required water quality test results were not submitted to the Ohio EPA for a specified monitoring period.
According to the Ohio EPA Division of Drinking and Ground Waters, Clermont’s public water system failed to submit results for haloacetic acid testing — known as HAA5 — for the monitoring period of February 8-14, 2026.
Haloacetic acids are disinfection byproducts that form when chlorine or other disinfectants used to treat drinking water react with naturally occurring organic matter. Long-term exposure above federal limits has been linked to increased cancer risk. The EPA sets a maximum contaminant level for HAA5 in public drinking water.
It is important to note that an apparent monitoring violation means the required test results were not submitted to the state — not necessarily that contamination was detected or that the water is unsafe. Ohio EPA flags these violations when laboratories or water systems fail to report results within the required window.
The Ohio EPA is urging laboratories with outstanding results to submit them through the state’s eDWR system as soon as possible to prevent the system from receiving a formal violation letter.
