We read 9 results from Aquarion-Stamford’s 2025 water quality report. No results over a legal limit or above a health goal.
Serves about 119,214 people · Water system ID CT1350011 · 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 |
|---|---|---|---|---|
| Bariumaverage · range 0.01 to 0.02 · Entry points · 2025 report, page 3 | 0.02 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineaverage · range ND to 1.57 · Distribution system · 2025 report, page 3 | 0.84 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 3 | 0.17 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 29 to 66 · Distribution system · 2025 report, page 4 | 53 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 29 to 87 · Distribution system · 2025 report, page 4 | 64 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.65 to 0.8 · Entry points · 2025 report, page 3 | 0.71 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)average · range ND to 0.79 · Entry points · 2025 report, page 3 | 0.65 ppm | 10 ppm | 10 ppm | Below the health goal |
| Turbidity (cloudiness)highest measured · range 0.03 to 0.13 · Surface water treatment plants · 2025 report, page 3 | 0.13 NTU | None set | 1 NTU | Below the legal limit |
| Sodiumaverage · range 16 to 44 · Distribution system · 2025 report, page 4 | 35 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Aquarion-Stamford’s water between Mar 2025 and Dec 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA4.3 pptFound in 3 of 8 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.
PFAS ("forever chemicals")
Found: PFOA (EPA testing)
What removes it: Reverse osmosis.
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