What's in WINNETKA's water?

WINNETKA's only violations on record are reporting or monitoring lapses, not a contaminant or treatment-technique failure EPA classifies as health-based. It serves 12,475 people through 4,477 service connections.

How this compares nationally

WINNETKA has 13 violations on record in total, 0 of thems health-based - ranking it 10,253th of 12,903 systems by violation count, the 21th percentile nationally.

How WINNETKA compares within IL

IL's 560 covered systems average 5.0 health-based violations each; WINNETKA carries 0, not 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 WINNETKA is from 2010-01-07. Last reported to EPA: 05/27/2026.

What this data is and is not

This is what WINNETKA 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. Between the utility's meter and WINNETKA's customers' taps is household plumbing, invisible to a system-level record ranked 10,253th of 12,903 by violation count. The guide to what this data misses covers that gap.