GRAYSLAKE: EPA violation history, explained
GRAYSLAKE has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 21,248 people get their water from it, across 7,298 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, GRAYSLAKE ranks 3,215th by violation burden (75th percentile) - 12 violations total, 6 health-baseds.
How GRAYSLAKE compares within IL
IL's 560 covered systems average 5.0 health-based violations each; GRAYSLAKE carries 6, 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 GRAYSLAKE is from 2006-01-07 (health-based: 2000-01-09). Last reported to EPA: 05/27/2026.
What kind of problem, specifically
GRAYSLAKE'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
Everything on this page is GRAYSLAKE's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 6 health-based violations on file for GRAYSLAKE - 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.