We read 13 results from Alderwood Water District’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 200,000 people · Water system ID WA5301300 · 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 |
|---|---|---|---|---|
| Arsenicaverage · range ND to 0.14 · Everett treatment plant · 2025 report, page 14 | 0.11 ppb | 0.004 ppb | 10 ppb | Above the health goal28x the health goal |
| Lead90th percentile of 108 homes tested, 0 over the action level · sampled 2024 · Customer taps (108 homes, regional group) · 2025 report, page 14 | 2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal10x the health goal |
| Chlorineaverage · range 0.2 to 1.4 · Distribution system · 2025 report, page 13 | 0.74 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 108 homes tested, 0 over the action level · sampled 2024 · Customer taps (108 homes, regional group) · 2025 report, page 14 | 0.09 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 30 to 47.7 · Distribution system · 2025 report, page 13 | 38.8 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 42.2 to 68 · Distribution system · 2025 report, page 13 | 52.6 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.2 to 0.7 · Distribution system · 2025 report, page 13 | 0.6 ppm | 1 ppm | 4 ppm | Below the health goal |
| Total coliform bacteriahighest month · Distribution system · 2025 report, page 13 | Not detected | 0 % positive | 5 % positive | Not detected |
| Turbidity (cloudiness)highest measured · Everett treatment plant · 2025 report, page 13 | 0.04 NTU | None set | 1 NTU | Below the legal limit |
| Bromodichloromethaneaverage · range 1.4 to 2.2 · Distribution system · 2025 report, page 14 | 1.8 ppb | None set | None | No health limit |
| Chloroformaverage · range 29.4 to 66 · Distribution system · 2025 report, page 14 | 41.8 ppb | None set | None | No health limit |
| Hardnessaverage · range 0.6 to 0.92 · Everett distribution system · 2025 report, page 14 | 0.73 gpg (12.5 ppm) | — | — | Soft |
| Sodiumaverage · range 4.9 to 7.1 · Everett treatment plant · 2025 report, page 14 | 6 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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