We read 20 results from Sharon Water Dept’s 2021 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 16,991 people · Water system ID MA4266000 · Read the district’s 2021 report (opens in a new tab)
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Results from the 2021 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 0.1 to 10.6 · 2021 report, page 4 | 10.6 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · range 0.89 to 2.39 · 2021 report, page 4 | 2.39 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Chlorineaverage · range 0.11 to 1.21 · sampled 2025 · 2021 report, page 4 | 0.56 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2025 · 2021 report, page 4 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 2.2 to 5.6 · sampled 2025 · Site 4 · 2021 report, page 4 | 3.75 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 4.2 to 20.9 · sampled 2025 · Site 4 · 2021 report, page 4 | 14.8 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.58 to 0.76 · sampled 2025 · 2021 report, page 4 | 0.76 ppm | 1 ppm | 4 ppm | Below the health goal |
| Manganesehighest measured · range 0.01 to 0.02 · sampled 2025 · 2021 report, page 4 | 0.02 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range 0.12 to 4.81 · sampled 2025 · 2021 report, page 4 | 4.81 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchloratehighest measured · range 0.07 to 0.18 · sampled 2025 · 2021 report, page 4 | 0.18 ppb | 1 ppb | 6 ppb | Below the health goal |
| PFNA (a PFAS)highest measured · range 0.25 to 0.67 · sampled 2025 · 2021 report, page 4 | 0.67 ppt | None set | 20 ppt (Massachusetts) now; 10 ppt from 2029 | Below the legal limit |
| Sulfatehighest measured · sampled 2025 · 2021 report, page 4 | 26.4 ppm | — | 250 ppm guideline | Within the guideline |
| Bromodichloromethanehighest measured · range 1 to 5.2 · sampled 2025 · 2021 report, page 4 | 5.2 ppb | None set | None | No health limit |
| Bromoformhighest measured · range 0.8 to 5.1 · sampled 2025 · 2021 report, page 4 | 5.1 ppb | None set | None | No health limit |
| Calciumhighest measured · range 10.5 to 39.4 · sampled 2025 · 2021 report, page 4 | 39.4 ppm | None set | None | No health limit |
| Chloroformhighest measured · range 0.52 to 4.1 · sampled 2025 · 2021 report, page 4 | 4.1 ppb | None set | None | No health limit |
| Dibromochloromethanehighest measured · range 1.4 to 7.6 · sampled 2025 · 2021 report, page 4 | 7.6 ppb | None set | None | No health limit |
| PFBS (a PFAS)highest measured · range 0.08 to 8.19 · sampled 2025 · 2021 report, page 4 | 8.19 ppt | None set | None | No health limit |
| PFHxA (a PFAS)highest measured · range 0.14 to 13.3 · sampled 2025 · 2021 report, page 4 | 13.3 ppt | None set | None | No health limit |
| Sodiumhighest measured · range 34.9 to 112 · sampled 2025 · 2021 report, page 4 | 112 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. 4 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 Sharon Water Dept’s water between Nov 2024 and May 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA8.1 pptFound in 6 of 12 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS15 pptFound in 3 of 12 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS29 pptFound in 2 of 12 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.
- PFBS4.7 pptFound in 4 of 12 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), PFOS (EPA testing)
What removes it: Reverse osmosis.
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