We read 11 results from Quincy Water Dept. (Mwra)’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 106,000 people · Water system ID MA3243000 · 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 |
|---|---|---|---|---|
| Lead90th percentile of 20 homes tested, 0 over the action level · Quincy customer taps (homes with lead service connections) · 2025 report | 8.74 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal44x the health goal |
| Radium-226average · sampled 2023 · MWRA system · 2025 report | 0.82 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal16x the health goal |
| Bariumaverage · range 0.007 to 0.009 · MWRA system · 2025 report | 0.008 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 0.02 to 3.7 · MWRA system · 2025 report | 1.99 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 20 homes tested, 0 over the action level · printed as 72.7 ppb · Quincy customer taps · 2025 report | 0.07 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range 2.5 to 23.2 · MWRA system · 2025 report | 15.8 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 2.8 to 35.3 · MWRA system · 2025 report | 16.1 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.4 to 0.8 · MWRA system · 2025 report | 0.71 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.01 to 0.64 · MWRA system · 2025 report | 0.64 ppm | 10 ppm | 10 ppm | Below the health goal |
| Nitrite (as N)average · range ND to 0.005 · MWRA system · 2025 report | 0.005 ppm | 1 ppm | 1 ppm | Below the health goal |
| Sodiumhighest measured · MWRA system · 2025 report | 35.6 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. 1 number we weren’t sure about is 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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