Walla Walla Water Division

Water Quality Snapshot: Walla Walla Water Division

Walla Walla Water Division is a local-owned community water system that delivers drinking water to 42,959 residents in Walla Walla, Washington (Walla Walla County) through 15,281 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 141 total violations for this system , of which 83 (59%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 58 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 57 violations (TT, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%).

Walla Walla Water Division's 141 violations sit above the Washington average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.