Tualatin, City Of, OR
Exceeded the action level in the past
Latest 90th-percentile lead: 4.93 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Tualatin, City Of
Tualatin, City Of serves about 28,106 people through 7,400 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 Washington County, Oregon. EPA system ID: OR4100906; phone on file: 503-691-3095. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 2.69 ppb from 7.62 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Tualatin, City Of is 17.4 ppb across 14 monitoring periods, 3 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.93 ppb |
| 2024 | 7.62 ppb |
| 2023 | 10 ppb |
| 2023 | 5 ppb |
| 2022 | 10 ppb |
| 2021 | 15 ppb over 10 |
| 2020 | 12 ppb over 10 |
| 2019 | 12 ppb over 10 |
| 2018 | 12 ppb over 10 |
| 2018 | 17 ppb over 15 |
| 2017 | 16 ppb over 15 |
| 2017 | 14.5 ppb over 10 |
| 2016 | 17.4 ppb over 15 |
| 2016 | 13 ppb over 10 |
How Tualatin, City Of compares
Of the 909 Oregon systems with a lead result, the median latest reading is 1 ppb; 15 are over 15 ppb right now and 71 have gone over at some point. Tualatin, City Of's 4.93 ppb sits at the 88th percentile in Oregon and the 90th nationally (higher means more lead).
Nearby utilities
28 other systems share Washington County; 4 of them have a higher latest lead result than Tualatin, City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tualatin Valley Water District | 224,600 | 5.3 ppb |
| Hillsboro, City Of | 92,632 | 0 (not detected) |
| Beaverton, City Of | 88,045 | 2.6 ppb |
| Tigard, City Of | 62,500 | 0.98 ppb |
| Forest Grove, City Of | 26,838 | 3.6 ppb |
| Sherwood, City Of | 20,781 | 1.3 ppb |
| Cornelius, City Of | 14,490 | 0 (not detected) |
| West Slope Water District | 11,000 | 5.01 ppb |
| Raleigh Water District | 4,500 | 5.01 ppb |
| North Plains Water Department | 3,663 | 0 (not detected) |
Next steps for Tualatin, OR
Test your own tap with a certified lab first-draw sample; Tualatin, OR 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 Tualatin, City Of 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. What a 90th-percentile result does and does not tell you: how to read a lead result. More in what a past exceedance means today.