MOKENA: EPA violation history, explained
MOKENA has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 19,887, over 7,250 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, MOKENA ranks 6,399th by violation burden (50th percentile) - 13 violations total, 2 health-baseds.
How MOKENA compares within IL
IL's 560 covered systems average 5.0 health-based violations each; MOKENA carries 2, 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 MOKENA is from 2024-01-07 (health-based: 2012-01-07). Last reported to EPA: 05/27/2026.
What kind of problem, specifically
MOKENA'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
This is what MOKENA 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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 13 logged violations can see. The guide to what this data misses covers that gap.