We read 12 results from City of Gresham’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 73,932 people · Water system ID OR4100357 · 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 · Entry points · 2025 report, page 6 | 1.03 ppb | 0.004 ppb | 10 ppb | Above the health goal258x the health goal |
| Lead90th percentile of 62 homes tested, 0 over the action level · High-risk homes · 2025 report, page 10 | 3.45 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal17x the health goal |
| Bariumhighest measured · range 0.0008 to 0.03 · Entry points · 2025 report, page 6 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloraminehighest running annual average · range 0.02 to 2.76 · Distribution system · 2025 report, page 6 | 2.13 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 62 homes tested, 0 over the action level · High-risk homes · 2025 report, page 10 | 0.11 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 8 to 48 · Distribution system · 2025 report, page 6 | 31 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 13 to 54 · Distribution system · 2025 report, page 6 | 38 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range ND to 0.13 · Entry points · 2025 report, page 6 | 0.13 ppm | 1 ppm | 4 ppm | Below the health goal |
| Manganeseaverage · printed as 23.9 ppb · Entry points · 2025 report, page 6 | 0.02 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range 0.01 to 0.11 · Entry points · 2025 report, page 6 | 0.11 ppm | 10 ppm | 10 ppm | Below the health goal |
| Radonaverage · Entry points · 2025 report, page 6 | 194 pCi/L | None set | None | No health limit |
| Sodiumaverage · Entry points · 2025 report, page 6 | 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.
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