CLARENDON HILLS: EPA violation history, explained

CLARENDON HILLS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 8,702 people through 2,742 service connections.

CLARENDON HILLS's record against the rest of the country

CLARENDON HILLS has 8 violations on record in total, 1 of them health-based - ranking it 8,375th of 12,903 systems by violation count, the 35th percentile nationally.

How CLARENDON HILLS compares within IL

CLARENDON HILLS's 1 health-based violations sit within the IL average of 5.0, across 560 systems statewide. The filter guide explains what a violation like this actually calls for.

Most recent violation on record

The last violation EPA has on record for CLARENDON HILLS is from 2023-01-01 (health-based: 1992-01-09). Last reported to EPA: 05/27/2026.

What kind of problem, specifically

CLARENDON HILLS'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: Coliform (TCR)

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

This is what CLARENDON HILLS reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. Between the utility's meter and CLARENDON HILLS's customers' taps is household plumbing, invisible to a system-level record ranked 8,375th of 12,903 by violation count. The guide to what this data misses covers that gap.