Is Walla Walla, WA tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for Walla Walla Water Division.
Walla Walla Water Division supplies Walla Walla (42,959 people).
Water system
Walla Walla Water Division
42,959 people · Surface water · EPA ID WA5392500
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 4.4 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 36
Across Washington, 20 of 245 water systems EPA tested had PFAS above a 2024 federal limit, and 17 systems were above the lead action level in results from the last five years. Washington results.
Walla Walla homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Walla Walla city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Pasco 40 mi Pasco Water Department | None above limits | 1.9 ppb |
| Kennewick 41 mi City of Kennewick | Above limit | 0 ppb |
| Richland 48 mi City of Richland | None above limits | 2.4 ppb |
| Pullman 72 mi City of Pullman Water Department | None above limits | 2.1 ppb |
| Moses Lake 86 mi City of Moses Lake | Above limit | 3.2 ppb |
| Yakima 112 mi City of Yakima Water Division | None above limits | 0 ppb |
Walla Walla ZIP codes (1)
- 99362
Questions
Is Walla Walla tap water safe to drink?
Walla Walla Water Division had 36 health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Walla Walla, WA?
Walla Walla Water Division, which serves 42,959 people.
Does Walla Walla tap water have PFAS?
None detected above EPA's reporting limits. Walla Walla Water Division had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Walla Walla homes have lead pipes?
Census estimates put 68% of Walla Walla homes as built before 1980 (Washington: 43%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Walla Walla Water Division's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.