We read 13 results from City of Tualatin’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 28,106 people · Water system ID OR4100906 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Arsenichighest measured · range ND to 1.03 · Portland treated water · 2025 report, page 9 | 1.03 ppb | 0.004 ppb | 10 ppb | Above the health goal258x the health goal |
| Lead90th percentile of 41 homes tested, 0 over the action level · Tier One homes · 2025 report, page 15 | 4.9 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal25x the health goal |
| Bariumhighest measured · range 0.0008 to 0.01 · Portland treated water · 2025 report, page 9 | 0.01 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 0.06 to 2.8 · Tualatin distribution · 2025 report, page 10 | 2.07 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 63 homes tested, 0 over the action level · Tier One homes · 2025 report, page 15 | 0.13 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 11.3 to 34 · Tualatin distribution · 2025 report, page 10 | 25.3 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 16.9 to 34.7 · Tualatin distribution · 2025 report, page 10 | 27.8 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range ND to 0.1 · Portland treated water · 2025 report, page 9 | 0.1 ppm | 1 ppm | 4 ppm | Below the health goal |
| Manganeseaverage · range 0.0019 to 0.04 · printed as 23.9 ppb · Portland treated water · 2025 report, page 9 | 0.02 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 0.11 · Portland treated water · 2025 report, page 9 | 0.11 ppm | 10 ppm | 10 ppm | Below the health goal |
| Giardiahighest measured · range ND to 4.9 · Portland untreated source · 2025 report, page 9 | 4.9 cysts/L | None set | None | No health limit |
| Radonaverage · range ND to 388 · Portland treated water · 2025 report, page 9 | 194 pCi/L | None set | None | No health limit |
| Sodiumaverage · range 11 to 12 · Portland treated water · 2025 report, page 9 | 11.8 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
More districts: Oregon water quality · All states · Something look wrong? Tell us