ROCK ISLAND: EPA violation history, explained
ROCK ISLAND has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 39,018 people get their water from it, across 15,072 connections.
How this compares nationally
47 total violations and 3 health-based ones put ROCK ISLAND at the 63th percentile nationally for violation burden, rank 4,811 of 12,903.
How ROCK ISLAND compares within IL
ROCK ISLAND's 3 health-based violations sit within the IL average of 5.0, across 560 systems statewide. 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 ROCK ISLAND is from 2026-01-01 (health-based: 1988-01-08). Last reported to EPA: 05/27/2026.
What kind of problem, specifically
ROCK ISLAND'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:
- Disinfection byproducts - flagged from: TTHM
The most severe category on record is disinfection byproducts, which points toward a carbon-class filter if you want to address it directly.
What this data is and is not
This is what ROCK ISLAND 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. This record - 3 health-based violations on file for ROCK ISLAND - 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.