KING COUNTY WATER DISTRICT NO 90: EPA violation history, explained
KING COUNTY WATER DISTRICT NO 90 has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 20,100, over 8,081 connections.
Ranked against every other system in this dataset
KING COUNTY WATER DISTRICT NO 90 has 47 violations on record in total, 2 of thems health-based - ranking it 5,932th of 12,903 systems by violation count, the 54th percentile nationally.
Against the WA average
Among the 322 WA systems in this dataset, the average is 3.7 health-based violations - KING COUNTY WATER DISTRICT NO 90's 2 is at or below that. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
KING COUNTY WATER DISTRICT NO 90's most recent violation on record is dated 2024-01-07, with the most recent health-based one dated 1992-01-07. Last reported to EPA: 06/19/2026.
The concern categories on record
KING COUNTY WATER DISTRICT NO 90'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)
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 KING COUNTY WATER DISTRICT NO 90's record does not cover
KING COUNTY WATER DISTRICT NO 90's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Between the utility's meter and KING COUNTY WATER DISTRICT NO 90's customers' taps is household plumbing, invisible to a system-level record ranked 5,932th of 12,903 by violation count. The guide to what this data misses covers that gap.