We read 7 results from Ferndale’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 19,305 people · Water system ID WA5324850 · 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 |
|---|---|---|---|---|
| Arsenicsingle sample · printed as 0.0013 ppm · Treatment plant · 2025 report, page 2 | 1.3 ppb | 0.004 ppb | 10 ppb | Above the health goal325x the health goal |
| Chlorineaverage · range 0.51 to 1.03 · 2025 report, page 2 | 0.85 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range ND to 1 · 2025 report, page 2 | 0.5 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 1.4 to 11.4 · 2025 report, page 2 | 6.4 ppb | None set | 80 ppb | Below the legal limit |
| Manganesesingle sample · Treatment plant · 2025 report, page 2 | 0.0021 ppm | — | 0.05 ppm guideline | Within the guideline |
| Seleniumsingle sample · printed as 0.0012 ppm · Treatment plant · 2025 report, page 2 | 1.2 ppb | 30 ppb | 50 ppb | Below the health goal |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 1 number we weren’t sure about is held back until a person checks.
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.
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