We read 11 results from Duxbury Water Department’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 16,387 people · Water system ID MA4082000 · 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 |
|---|---|---|---|---|
| Copper90th percentile of 35 homes tested, 0 over the action level · sampled 2023 · 2025 report, page 4 | 0.49 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.6x the health goal |
| Aluminumaverage · range ND to 0.07 · printed as 65 ppb · 2025 report, page 4 | 0.07 ppm | — | 0.2 ppm guideline | Within the guideline |
| Chlorideaverage · range 21 to 68 · 2025 report, page 4 | 53 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.02 to 0.79 · 2025 report, page 4 | 0.47 ppm | None set | 4 ppm | Below the legal limit |
| Fluorideaverage · range ND to 0.88 · 2025 report, page 4 | 0.64 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironaverage · range ND to 0.29 · printed as 291 ppb · 2025 report, page 4 | 0.29 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganeseaverage · range ND to 0.07 · printed as 35 ppb · 2025 report, page 4 | 0.04 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)average · range 0.32 to 5.3 · 2025 report, page 4 | 2.5 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHaverage · range 6.85 to 8.3 · 2025 report, page 4 | 7.69 | — | — | Normal range |
| Sulfateaverage · range 8.6 to 14 · 2025 report, page 4 | 10 ppm | — | 250 ppm guideline | Within the guideline |
| PFAS (total of measured)highest measured · range ND to 9.64 · 2025 report, page 4 | 9.64 ppt | 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. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Duxbury Water Department’s water between Jul 2024 and May 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA7.5 pptFound in 3 of 16 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS35 pptFound in 2 of 16 samples · highest resultHighest sample is above the 20 ppt Massachusetts limit (for the sum of 6 PFAS). Compliance is judged on averages, not one sample.
- PFHxS31 pptFound in 2 of 16 samples · highest resultHighest sample is above the 20 ppt Massachusetts limit (for the sum of 6 PFAS). Compliance is judged on averages, not one sample.
- PFBS3.5 pptFound in 2 of 16 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.
Copper
Found: Copper
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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