Is ONTARIO MUNICIPAL UTILITIES COMPANY's water safe to drink?
ONTARIO MUNICIPAL UTILITIES COMPANY has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 185,010, over 39,996 connections.
Ranked against every other system in this dataset
ONTARIO MUNICIPAL UTILITIES COMPANY has 2 violations on record in total, 1 of them health-based - ranking it 9,068th of 12,903 systems by violation count, the 30th percentile nationally.
How ONTARIO MUNICIPAL UTILITIES COMPANY compares within CA
CA's 803 covered systems average 5.8 health-based violations each; ONTARIO MUNICIPAL UTILITIES COMPANY carries 1, not more than typical for the state. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
The last violation EPA has on record for ONTARIO MUNICIPAL UTILITIES COMPANY is from 1993-01-06 (health-based: 1993-01-06). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
ONTARIO MUNICIPAL UTILITIES COMPANY's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Surface Water Treatment Rule
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
ONTARIO MUNICIPAL UTILITIES COMPANY'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. This record - 1 health-based violation on file for ONTARIO MUNICIPAL UTILITIES COMPANY - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.