We read 13 results from Kennewick City of’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 114,468 people · Water system ID WA5338100 · Read the district’s 2025 report (opens in a new tab)
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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 1 to 3.3 · printed as 0.0033 mg/L · Sources · 2025 report, page 6 | 3.3 ppb | 0.004 ppb | 10 ppb | Above the health goal825x the health goal |
| Copper90th percentile of 51 homes tested, 0 over the action level · Customer taps · 2025 report, page 6 | 0.44 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.5x the health goal |
| Gross alpha (radioactivity)highest measured · Sources · 2025 report, page 6 | 6.34 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Gross beta (radioactivity)highest measured · range 0.18 to 0.64 · Sources · 2025 report, page 6 | 0.64 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| PFOS (a PFAS)single sample · Ranney Collectors · 2025 report, page 5 | 16.7 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20294.2x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Chlorinehighest measured · range 0.2 to 2 · Distribution system · 2025 report, page 6 | 1.7 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 29.7 · Distribution system · 2025 report, page 6 | 19.6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 81 · Distribution system · 2025 report, page 6 | 58.8 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.001 to 0.27 · Sources · 2025 report, page 6 | 0.27 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of 51 homes tested, 0 over the action level · printed as ND ppm · Customer taps · 2025 report, page 6 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range 0.05 to 5.45 · Sources · 2025 report, page 6 | 5.45 ppm | 10 ppm | 10 ppm | Below the health goal |
| Turbidity (cloudiness)highest measured · range 0.02 to 0.09 · Ranney Collector 4 · 2025 report, page 6 | 0.09 NTU | None set | 1 NTU | Below the legal limit |
| Hardnesshighest measured · range 2.92 to 11.7 · City water · 2025 report, page 3 | 11.7 gpg (200 ppm) | — | — | Very hard |
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 Kennewick City of’s water between Feb 2023 and Jan 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA4.6 pptFound in 2 of 8 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS11.5 pptFound in 4 of 8 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS10.6 pptFound in 4 of 8 samples · highest resultNo federal limit in force for this one
- PFBS6.4 pptFound in 4 of 8 samples · highest resultNo federal limit in force for this one
- Lithium9.38 ppbFound in 1 of 8 samples · highest resultBelow EPA’s health reference level of 10 ppb
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.
Copper
Found: Copper
What removes it: Reverse osmosis.
Radium and uranium
Found: Gross alpha (radioactivity), Gross beta (radioactivity)
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOS (a PFAS), PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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