We read 14 results from Woonsocket Water Division’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 45,869 people · Water system ID RI1559518 · 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 |
|---|---|---|---|---|
| Chloritehighest measured · range 0.02 to 0.71 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 0.71 ppm | 0.05 ppm | 1 ppm | Above the health goal14x the health goal |
| Lead90th percentile of 30 homes tested, 1 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 4 | 7.9 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal40x the health goal |
| Manganeseaverage · range 0.01 to 0.2 · listed as a violation in the report · printed as 55 ppb · Treatment plant · 2025 report, page 4 | 0.06 ppm | — | 0.05 ppm guideline | Above the guideline1.1x the guideline (taste, odor or stains; not a health limit) |
| Bariumhighest measured · range 0.007 to 0.03 · listed as a violation in the report · Treatment plant · 2025 report, page 4 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineas reported · range ND to 1.55 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 0.5 ppm | None set | 4 ppm | Below the legal limit |
| Chlorine dioxidehighest measured · range ND to 710 · listed as a violation in the report · Treatment plant · 2025 report, page 4 | 710 ppb | None set | 800 ppb | Below the legal limit |
| Chromium (total)highest measured · range ND to 1 · listed as a violation in the report · sampled 2021 · Treatment plant · 2025 report, page 4 | 1 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 4 | 0.04 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Cyanidehighest measured · range ND to 65 · listed as a violation in the report · sampled 2022 · Treatment plant · 2025 report, page 4 | 65 ppb | 150 ppb | 200 ppb | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 10.1 to 33.9 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 26.2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 21.7 to 85.6 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 67.4 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.59 to 0.99 · listed as a violation in the report · Treatment plant · 2025 report, page 4 | 0.99 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range ND to 0.22 · listed as a violation in the report · Treatment plant · 2025 report, page 4 | 0.22 ppm | 10 ppm | 10 ppm | Below the health goal |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · Treatment plant · 2025 report, page 4 | 0.59 NTU | None set | 1 NTU | Below the legal 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 Woonsocket Water Division’s water between Mar 2023 and Dec 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5.8 pptFound in 1 of 4 samples · highest resultAbove 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
Sediment or cloudy water
Found: Manganese
What removes it: Oxidation filter.
PFAS ("forever chemicals")
Found: PFOA (EPA testing)
What removes it: Reverse osmosis.
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