We read 12 results from Hudson Water Supply’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 20,032 people · Water system ID MA2141000 · 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 60 homes tested, 0 over the action level · Customer taps · 2025 report, page 4 | 0.42 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.4x the health goal |
| PFOA (a PFAS)single sample · Surface Water (Gates Pond) · 2025 report, page 4 | 3.6 ppt | 0.007 ppt | 20 ppt (Massachusetts) now; 4 ppt from 2029 | Above the health goal514x the health goal |
| Chlorinehighest running annual average · range 1.12 to 1.66 · 2025 report, page 5 | 1.56 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 25 · 2025 report, page 5 | 25 ppb | None set | 60 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.24 to 0.57 · 2025 report, page 4 | 0.57 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range ND to 1.5 · 2025 report, page 4 | 1.5 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchloratehighest measured · range 0.17 to 0.34 · 2025 report, page 4 | 0.34 ppb | 1 ppb | 6 ppb | Below the health goal |
| pHaverage · range 7.36 to 8.6 · 2025 report, page 5 | 7.94 | — | — | Normal range |
| Sulfateaverage · range 15 to 16 · 2025 report, page 5 | 15.5 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 66 to 270 · 2025 report, page 5 | 168 ppm | — | 500 ppm guideline | Within the guideline |
| PFBA (a PFAS)single sample · printed as 0.0060 ppb · 2025 report, page 5 | 6 ppt | None set | None | No health limit |
| Sodiumsingle sample · 2025 report, page 5 | 20.6 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. 2 numbers we weren’t sure about are 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.
Copper
Found: Copper
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (a PFAS)
What removes it: Reverse osmosis.
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