Is JOLIET's water safe to drink?
JOLIET had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 160,000 people get their water from it, across 49,000 connections.
JOLIET's record against the rest of the country
JOLIET has 64 violations on record in total, 42 of thems health-based - ranking it 351th of 12,903 systems by violation count, the 97th percentile nationally.
Against the average
's 244 covered systems average 11.2 health-based violations each; JOLIET carries 42, more than typical for the state. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
JOLIET's most recent violation on record is dated 2025-05-10, with the most recent health-based one dated 2025-05-10. Last reported to EPA: 05/27/2026.
The concern categories on record
JOLIET'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 REVISIONS; Lead and Copper Rule
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
- Radionuclides - flagged from: Combined Radium (-226 and -228); Gross Alpha, Excl. Radon and U
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What JOLIET's record does not cover
This is what JOLIET 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 64 logged violations can see. The guide to what this data misses covers that gap.