CHEHALIS WATER DEPARTMENT: EPA violation history, explained
CHEHALIS WATER DEPARTMENT has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 11,718 people get their water from it, across 4,382 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, CHEHALIS WATER DEPARTMENT ranks 4,051th by violation burden (69th percentile) - 40 violations total, 4 health-baseds.
How CHEHALIS WATER DEPARTMENT compares within WA
CHEHALIS WATER DEPARTMENT's 4 health-based violations sit above the WA average of 3.7, across 322 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 CHEHALIS WATER DEPARTMENT is from 2024-01-07 (health-based: 2005-01-05). Last reported to EPA: 06/19/2026.
What kind of problem, specifically
CHEHALIS WATER DEPARTMENT'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
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
This is what CHEHALIS WATER DEPARTMENT 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 - 4 health-based violations on file for CHEHALIS WATER DEPARTMENT - 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.