LAKE ZURICH: EPA violation history, explained
LAKE ZURICH has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 19,759 people through 6,862 service connections.
Ranked against every other system in this dataset
39 total violations and 35 health-based ones put LAKE ZURICH at the 96th percentile nationally for violation burden, rank 464 of 12,903.
How LAKE ZURICH compares within IL
IL's 560 covered systems average 5.0 health-based violations each; LAKE ZURICH carries 35, more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for LAKE ZURICH is from 2023-01-10 (health-based: 2009-01-04). Last reported to EPA: 05/27/2026.
What kind of problem, specifically
LAKE ZURICH'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:
- Radionuclides - flagged from: Combined Radium (-226 and -228); Gross Alpha, Excl. Radon and U
- Other regulated metals - flagged from: Barium
The most severe category on record is radionuclides, which points toward a reverse osmosis-class filter if you want to address it directly.
What this data is and is not
This is what LAKE ZURICH 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 LAKE ZURICH's customers' taps is household plumbing, invisible to a system-level record ranked 464th of 12,903 by violation count. The guide to what this data misses covers that gap.