ONTARIO CITY: EPA violation history, explained

ONTARIO CITY's only violations on record are reporting or monitoring lapses, not a contaminant or treatment-technique failure EPA classifies as health-based. Population served: 6,756, over 2,769 connections.

Ranked against every other system in this dataset

Out of 12,903 systems in this dataset, ONTARIO CITY ranks 10,042th by violation burden (22th percentile) - 19 violations total, 0 health-baseds.

Against the OH average

ONTARIO CITY's 0 health-based violations sit within the OH average of 5.5, across 394 systems statewide. The clean-record guide covers what a comparison like this can hide.

Most recent violation on record

ONTARIO CITY's most recent violation on record is dated 2025-02-07. Last reported to EPA: 05/15/2026.

What ONTARIO CITY's record does not cover

ONTARIO CITY'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 19 logged violations can see. The guide to what this data misses covers that gap.