OAK PARK: EPA violation history, explained
OAK PARK has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 54,583 people through 12,683 service connections.
How this compares nationally
OAK PARK has 9 violations on record in total, 2 of thems health-based - ranking it 6,564th of 12,903 systems by violation count, the 49th percentile nationally.
Against the IL average
IL's 560 covered systems average 5.0 health-based violations each; OAK PARK carries 2, not more than typical for the state. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
OAK PARK's most recent violation on record is dated 1997-01-04, with the most recent health-based one dated 1994-01-01. Last reported to EPA: 05/27/2026.
The concern categories on record
OAK PARK'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
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What OAK PARK's record does not cover
OAK PARK's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. This record - 2 health-based violations on file for OAK PARK - 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.