WONDER LAKE: EPA violation history, explained
WONDER LAKE had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 3,870 people get their water from it, across 1,548 connections.
Ranked against every other system in this dataset
WONDER LAKE has 87 violations on record in total, 2 of thems health-based - ranking it 5,796th of 12,903 systems by violation count, the 55th percentile nationally.
How WONDER LAKE compares within IL
WONDER LAKE's 2 health-based violations sit within the IL average of 5.0, across 560 systems statewide. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for WONDER LAKE is from 2025-01-07 (health-based: 2023-02-04). Last reported to EPA: 05/27/2026.
What kind of problem, specifically
WONDER LAKE'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:
- Lead & copper - flagged from: Lead and Copper Rule
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What this data is and is not
This is what WONDER LAKE 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 - 2 health-based violations on file for WONDER LAKE - 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.