MACKINAW: EPA violation history, explained
MACKINAW has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 3,399, over 1,345 connections.
How this compares nationally
MACKINAW has 7 violations on record in total, 1 of them health-based - ranking it 8,493th of 12,903 systems by violation count, the 34th percentile nationally.
How MACKINAW compares within IL
IL's 560 covered systems average 5.0 health-based violations each; MACKINAW carries 1, not more than typical for the state. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for MACKINAW is from 2005-01-07 (health-based: 1993-01-10). Last reported to EPA: 05/27/2026.
What kind of problem, specifically
MACKINAW'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:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
MACKINAW'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 - 1 health-based violation on file for MACKINAW - 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.