Janesville Water Utility, WI Water Quality
What's in Janesville Water Utility's water?
Janesville Water Utility has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 64,415, over 23,857 connections.
Ranked against every other system in this dataset
3 total violations and 1 health-based ones put Janesville Water Utility at the 31th percentile nationally for violation burden, rank 8,937 of 12,903.
How Janesville Water Utility compares within WI
Janesville Water Utility's 1 health-based violations sit within the WI average of 5.4, across 259 systems statewide. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
The last violation EPA has on record for Janesville Water Utility is from 2016-01-04 (health-based: 2002-01-12). Last reported to EPA: 05/29/2026.
What kind of problem, specifically
Janesville Water Utility'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
Everything on this page is Janesville Water Utility's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Between the utility's meter and Janesville Water Utility's customers' taps is household plumbing, invisible to a system-level record ranked 8,937th of 12,903 by violation count. The guide to what this data misses covers that gap.