We read 16 results from Sudbury Water District’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 18,416 people · Water system ID MA3288000 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)highest measured · range ND to 1.08 · sampled 2023 · 2025 report, page 14 | 1.08 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · range 0.3 to 1 · sampled 2020 · 2025 report, page 14 | 1 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.009 to 0.06 · sampled 2024 · 2025 report, page 14 | 0.06 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest measured · range 0.15 to 1.11 · 2025 report, page 14 | 1.11 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2025 report, page 15 | 0.18 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 11 · 2025 report, page 15 | 8.4 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 41 · 2025 report, page 15 | 25 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.17 to 0.6 · 2025 report, page 14 | 0.6 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.58 to 5 · 2025 report, page 14 | 5 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchloratehighest measured · range 0.05 to 0.32 · 2025 report, page 15 | 0.32 ppb | 1 ppb | 6 ppb | Below the health goal |
| Bromodichloromethanehighest measured · range ND to 4 · 2025 report, page 16 | 4 ppb | None set | None | No health limit |
| Bromoformhighest measured · range ND to 0.68 · 2025 report, page 16 | 0.68 ppb | None set | None | No health limit |
| Chloroformhighest measured · range ND to 5 · 2025 report, page 16 | 5 ppb | None set | None | No health limit |
| Dibromochloromethanehighest measured · range ND to 2.8 · 2025 report, page 16 | 2.8 ppb | None set | None | No health limit |
| PFAS (total of measured)highest measured · range ND to 18.7 · 2025 report, page 15 | 18.7 ppt | None set | None | No health limit |
| Sodiumhighest measured · range 11.1 to 65.8 · 2025 report, page 16 | 65.8 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Sudbury Water District’s water between Dec 2024 and Jun 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA9 pptFound in 6 of 10 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFBS4 pptFound in 6 of 10 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.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (EPA testing)
What removes it: Reverse osmosis.
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