Thornton City of, CO Water Quality
What's in Thornton City of's water?
Thornton City of's only violations on record are reporting or monitoring lapses, not a contaminant or treatment-technique failure EPA classifies as health-based. Population served: 226,465, over 42,530 connections.
Thornton City of's record against the rest of the country
Out of 12,903 systems in this dataset, Thornton City of ranks 10,372th by violation burden (20th percentile) - 11 violations total, 0 health-based.
How Thornton City of compares within CO
Thornton City of's 0 health-based violations sit within the CO average of 3.0, across 230 systems statewide. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for Thornton City of is from 2023-01-11. Last reported to EPA: 06/17/2026.
What this data is and is not
Everything on this page is Thornton City of'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 11 logged violations can see. The guide to what this data misses covers that gap.