We read 25 results from Walpole Water Dept’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 24,070 people · Water system ID MA4307000 · 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 0.25 · sampled 2023 · Wells (treated) · 2025 report, page 6 | 0.25 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of 31 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 5 | 1.8 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal9x the health goal |
| Radium (combined 226 + 228)highest measured · range 0.77 to 2.38 · sampled 2023 · Wells (treated) · 2025 report, page 6 | 2.38 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Chloraminehighest measured · range 0.85 to 1.41 · Distribution system · 2025 report, page 6 | 1.41 ppm | None set | 4 ppm | Below the legal limit |
| Chlorideaverage · range 64 to 120 · Wells (treated) · 2025 report, page 7 | 69.5 ppm | — | 250 ppm guideline | Within the guideline |
| Coloraverage · range ND to 8 · Wells (treated) · 2025 report, page 7 | 4 CU | — | 15 CU guideline | Within the guideline |
| Copper90th percentile of 31 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 5 | 0.19 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Dalapon (herbicide)highest measured · range 0.32 to 0.52 · Wells (treated) · 2025 report, page 6 | 0.52 ppb | 200 ppb | 200 ppb | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 24 to 63 · Distribution system · 2025 report, page 6 | 38 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 41 to 87 · Distribution system · 2025 report, page 6 | 72 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.6 to 0.8 · Wells (treated) · 2025 report, page 6 | 0.8 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.45 to 0.91 · Wells (treated) · 2025 report, page 6 | 0.91 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchloratehighest measured · range 0.17 to 0.27 · Wells (treated) · 2025 report, page 6 | 0.27 ppb | 1 ppb | 6 ppb | Below the health goal |
| pHaverage · range 8.11 to 8.13 · Wells (treated) · 2025 report, page 7 | 8.12 | — | — | Normal range |
| Simazinehighest measured · range 0.1 to 0.13 · Wells (treated) · 2025 report, page 6 | 0.13 ppb | 4 ppb | 4 ppb | Below the health goal |
| Sulfateaverage · range 10 to 11 · Wells (treated) · 2025 report, page 7 | 10.5 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 280 to 320 · Wells (treated) · 2025 report, page 7 | 300 ppm | — | 500 ppm guideline | Within the guideline |
| Bromodichloromethaneaverage · range 0.5 to 12 · Distribution system · 2025 report, page 7 | 8.6 ppb | None set | None | No health limit |
| Chloroformaverage · range 0.5 to 53 · Distribution system · 2025 report, page 7 | 23.5 ppb | None set | None | No health limit |
| PFAS (total of measured)as reported · range 5.32 to 16.7 · Wells (treated) · 2025 report, page 6 | 16.7 ppt | None set | None | No health limit |
| PFBA (a PFAS)single sample · sampled 2024 · Wells (treated) · 2025 report, page 7 | 130 ppt | None set | None | No health limit |
| PFBS (a PFAS)average · range 1.5 to 1.95 · Wells (treated) · 2025 report, page 7 | 1.62 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range 1.91 to 7.92 · Wells (treated) · 2025 report, page 7 | 5.75 ppt | None set | None | No health limit |
| PFPeA (a PFAS)single sample · sampled 2024 · Wells (treated) · 2025 report, page 7 | 120 ppt | None set | None | No health limit |
| Sodiumaverage · range 33 to 66 · Wells (treated) · 2025 report, page 7 | 49.5 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Walpole Water Dept’s water between Aug 2023 and Mar 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA4 pptFound in 2 of 4 samples · highest resultBelow the federal limit that takes effect in 2029 (4 ppt)
- PFOS4 pptFound in 2 of 4 samples · highest resultBelow the federal limit that takes effect in 2029 (4 ppt)
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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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