Water Quality: Walla Walla, WA
15 water systems • 48,907 people served
Multiple Health ViolationsWater Quality Summary
Walla Walla is served by 15 public water systems with a combined service population of 48,907 people, and has 1,201 EPA Safe Drinking Water Act violations on record. Critically, 108 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Walla Walla's violation count is 641% above the national average for Washington. Contaminants associated with violations include Bromate, E. coli, Fecal Coliform.
Contaminants Found
Probable human carcinogen that increases the risk of kidney and thyroid cancers.
Common source: Ozonation of bromide-containing water; used as flour improver
EPA limit: 0.010 mg/L (10 ppb)
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
Water Systems Serving Walla Walla
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| WALLA WALLA WATER DIVISION | WA5392500 | Surface Water | 42,959 | 496 |
| CONSOLIDATED IRRIGATION DIST 14 | WA5314650 | Groundwater | 1,555 | 27 |
| WALLA WALLA UNIVERSITY | WA5392470 | Groundwater | 1,273 | 126 |
| VALLE LINDO HOMES | WA5392475 | Groundwater | 787 | 57 |
| GREEN TANK IRR DISTRICT 11 | WA5329550 | Groundwater | 553 | 153 |
| PRESCOTT TOWN OF | WA5369250 | Groundwater | 522 | 4 |
| HYDRO IRRIGATION DISTRICT NO 9 | WA5335275 | Groundwater | 252 | 0 |
| BLALOCK ORCHARD DIST 10 | WA5307350 | Groundwater | 250 | 2 |
| DIXIE WATER ASSOCIATION | WA5319480 | Groundwater | 240 | 32 |
| BLALOCK ORCHARDS DIST 12 | WA5307400 | Groundwater | 193 | 6 |
| SYDNEY HEIGHTS WATER ASSN | WA5386647 | Groundwater | 130 | 48 |
| SUMMERS CIRCLE WATER LLC | WA5307937 | Groundwater | 82 | 8 |
| KOOSKOOSKIE CABIN OWNERS INC. | WA5334751 | Groundwater | 45 | 40 |
| PROSPECT HEIGHTS COMM WATER ASSN | WA5369700 | Groundwater | 40 | 202 |
| RESER CREEK WATER SYSTEM | WA5304761 | Groundwater | 26 | 0 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Washington
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.