Walla Walla Water Division, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 4.4 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Walla Walla Water Division
Walla Walla Water Division serves about 42,959 people through 15,281 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Walla Walla County, Washington. EPA system ID: WA5392500. Ask the utility on your bill for your address in their service line inventory.
Walla Walla Water Division's lead record
That is up 1.9 ppb from 2.5 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Walla Walla Water Division is 5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.4 ppb |
| 2022 | 2.5 ppb |
| 2019 | 3.7 ppb |
| 2016 | 5 ppb |
Against other Washington systems
Of the 2,218 Washington systems with a lead result, the median latest reading is 1 ppb; 18 are over 15 ppb right now and 62 have gone over at some point. Walla Walla Water Division's 4.4 ppb sits at the 89th percentile in Washington and the 89th nationally (higher means more lead).
Other water systems in Walla Walla County
32 other systems share Walla Walla County; 3 of them have a higher latest lead result than Walla Walla Water Division. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| College Place Water Dept | 8,147 | 2.1 ppb |
| Snake River Housing Water System | 3,036 | 0 (not detected) |
| Waitsburg City Of | 1,817 | 1.7 ppb |
| Consolidated Irrigation Dist 14 | 1,555 | 0 (not detected) |
| Walla Walla University | 1,273 | 0 (not detected) |
| Valle Lindo Homes | 787 | 0 (not detected) |
| Veterans Affair Med Ctr Dept Of | 785 | 1 ppb |
| Great Basin Water Burbank | 656 | 0 (not detected) |
| Green Tank Irr District 11 | 553 | 0.6 ppb |
| Burbank Irrigation District 4 | 527 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Walla Walla, WA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Walla Walla Water Division whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. Systems that went over once often dip back under; here is what that means.