Gswc - Norwalk, CA Water Quality
What's in Gswc - Norwalk's water?
Gswc - Norwalk's only violations on record are reporting or monitoring lapses, not a contaminant or treatment-technique failure EPA classifies as health-based. 43,167 people get their water from it, across 9,416 connections.
Gswc - Norwalk's record against the rest of the country
2 total violations and 0 health-based ones put Gswc - Norwalk at the 8th percentile nationally for violation burden, rank 11,895 of 12,903.
Against the CA average
Among the 804 CA systems in this dataset, the average is 5.8 health-based violations - Gswc - Norwalk's 0 is at or below that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
Gswc - Norwalk's most recent violation on record is dated 1988-01-09. Last reported to EPA: 06/22/2026.
What Gswc - Norwalk's record does not cover
This is what Gswc - Norwalk 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. This record - 0 health-based violations on file for Gswc - Norwalk - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.