We read 10 results from Renton City of’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 107,119 people · Water system ID WA5371850 · 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 |
|---|---|---|---|---|
| Copper90th percentile of 53 homes tested, 0 over the action level · Customer taps · 2025 report, page 6 | 0.48 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.6x the health goal |
| Lead90th percentile of 53 homes tested, 0 over the action level · Customer taps · 2025 report, page 6 | 1.9 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal9.5x the health goal |
| PFOA (a PFAS)highest measured · range ND to 2.7 · Wells and springs · 2025 report, page 6 | 2.7 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal386x the health goal |
| Chlorineaverage · range 0.4 to 1.6 · Distribution system · 2025 report, page 6 | 0.9 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 7.4 · Distribution system · 2025 report, page 6 | 6.6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 5 to 17.6 · Distribution system · 2025 report, page 6 | 15.2 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.5 to 0.8 · Wells and springs · 2025 report, page 6 | 0.8 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.3 to 1.6 · Wells and springs · 2025 report, page 6 | 1.6 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFBS (a PFAS)highest measured · range ND to 3.6 · Wells and springs · 2025 report, page 6 | 3.6 ppt | None set | None | No health limit |
| Sodiumhighest measured · range 13.8 to 14.3 · Wells and springs · 2025 report, page 6 | 14.3 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Renton City of’s water between Mar 2023 and Sep 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFBS3 pptFound in 1 of 6 samples · highest resultNo federal limit in force for this one
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
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: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (a PFAS)
What removes it: Reverse osmosis.
More districts: Washington water quality · All states · Something look wrong? Tell us