Norwalk - City, Water Dept., CA Water Quality
Norwalk - City, Water Dept.: EPA violation history, explained
Norwalk - City, Water Dept. has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 20,283, over 5,401 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, Norwalk - City, Water Dept. ranks 9,192th by violation burden (29th percentile) - 1 violation total, 1 health-based.
How Norwalk - City, Water Dept. compares within CA
Norwalk - City, Water Dept.'s 1 health-based violations sit within the CA average of 5.8, across 804 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 Norwalk - City, Water Dept. is from 1999-01-01 (health-based: 1999-01-01). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
Norwalk - City, Water Dept.'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:
- Synthetic organic chemicals / pesticides / VOCs - flagged from: 1,2-Dichloroethane
The most severe category on record is synthetic organic chemicals / pesticides / vocs, which points toward a carbon-class filter if you want to address it directly.
What this data is and is not
Everything on this page is Norwalk - City, Water Dept.'s own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 1 logged violations can see. The guide to what this data misses covers that gap.