What's in Mattawa City of's water?
Mattawa City of had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. It serves 5,370 people through 1,026 service connections.
Mattawa City of's record against the rest of the country
178 total violations and 6 health-based ones put Mattawa City of at the 77th percentile nationally for violation burden, rank 2,909 of 12,903.
Against the WA average
Mattawa City of's 6 health-based violations sit above the WA average of 3.7, across 322 systems statewide. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
Mattawa City of's most recent violation on record is dated 2024-01-06, with the most recent health-based one dated 2024-01-06. Last reported to EPA: 06/19/2026.
The concern categories on record
Mattawa City of'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); Revised Total Coliform 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 Mattawa City of's record does not cover
Everything on this page is Mattawa City of's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 6 health-based violations on file for Mattawa City of - 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.