WALLA WALLA WATER DIVISION: EPA violation history, explained
WALLA WALLA WATER DIVISION has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 42,959 people through 15,281 service connections.
WALLA WALLA WATER DIVISION's record against the rest of the country
Out of 12,903 systems in this dataset, WALLA WALLA WATER DIVISION ranks 363th by violation burden (97th percentile) - 92 violations total, 41 health-baseds.
Against the WA average
Among the 322 WA systems in this dataset, the average is 3.7 health-based violations - WALLA WALLA WATER DIVISION's 41 is above that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
WALLA WALLA WATER DIVISION's most recent violation on record is dated 2023-01-01, with the most recent health-based one dated 2018-01-12. Last reported to EPA: 06/19/2026.
The concern categories on record
WALLA WALLA WATER DIVISION'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); Long Term 2 Enhanced Surface Water Treatment Rule; 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 WALLA WALLA WATER DIVISION's record does not cover
Everything on this page is WALLA WALLA WATER DIVISION's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Between the utility's meter and WALLA WALLA WATER DIVISION's customers' taps is household plumbing, invisible to a system-level record ranked 363th of 12,903 by violation count. The guide to what this data misses covers that gap.