Warren County, OH Water Quality
Warren County: EPA violation history, explained
Warren County's only violations on record are reporting or monitoring lapses, not a contaminant or treatment-technique failure EPA classifies as health-based. Population served: 81,975, over 30,361 connections.
How this compares nationally
Warren County has 48 violations on record in total, 0 of them health-based - ranking it 9,619th of 12,903 systems by violation count, the 25th percentile nationally.
Against the OH average
Warren County's 0 health-based violations sit within the OH average of 5.3, across 412 systems statewide. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
Warren County's most recent violation on record is dated 2024-05-09. Last reported to EPA: 05/15/2026.
What Warren County's record does not cover
Warren County's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 48 logged violations can see. The guide to what this data misses covers that gap.