CITY OF PATTERSON WATER SYSTEM: EPA violation history, explained
CITY OF PATTERSON WATER SYSTEM had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. Population served: 8,456, over 2,591 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, CITY OF PATTERSON WATER SYSTEM ranks 1,394th by violation burden (89th percentile) - 19 violations total, 14 health-baseds.
Against the LA average
Among the 347 LA systems in this dataset, the average is 12.6 health-based violations - CITY OF PATTERSON WATER SYSTEM's 14 is above that. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
CITY OF PATTERSON WATER SYSTEM's most recent violation on record is dated 2027-05-04, with the most recent health-based one dated 2026-01-01. Last reported to EPA: 06/23/2026.
The concern categories on record
CITY OF PATTERSON WATER SYSTEM'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); Surface Water Treatment Rule
- Disinfection byproducts - flagged from: TTHM
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 CITY OF PATTERSON WATER SYSTEM's record does not cover
Everything on this page is CITY OF PATTERSON WATER SYSTEM'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 19 logged violations can see. The guide to what this data misses covers that gap.