We read 15 results from Aquarion-Plainville Regional’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 18,231 people · Water system ID CT1100011 · 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 |
|---|---|---|---|---|
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | 0.62 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal2.1x the health goal |
| PFOA (a PFAS)average · range 3 to 7 · 2025 report, page 5 | 5 ppt | 0.007 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.3x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOS (a PFAS)average · range 3 to 7 · 2025 report, page 5 | 5 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.3x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Bariumaverage · range 0.28 to 0.41 · sampled 2024 · 2025 report, page 3 | 0.33 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 131 to 164 · sampled 2024 · 2025 report, page 4 | 146 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.06 to 1.05 · 2025 report, page 3 | 0.51 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 6 · 2025 report, page 3 | 4 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 4 to 30 · 2025 report, page 3 | 22 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.05 to 0.85 · 2025 report, page 3 | 0.73 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 1.26 to 2.28 · 2025 report, page 3 | 1.69 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHaverage · range 7.2 to 8.3 · 2025 report, page 4 | 7.8 | — | — | Normal range |
| Sulfateaverage · range 10 to 25 · sampled 2024 · 2025 report, page 4 | 17 ppm | — | 250 ppm guideline | Within the guideline |
| PFBS (a PFAS)average · range 2 to 2.5 · 2025 report, page 5 | 2 ppt | None set | None | No health limit |
| Sodiumaverage · range 48 to 100 · sampled 2024 · 2025 report, page 4 | 71 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 Aquarion-Plainville Regional’s water between Feb 2023 and Aug 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5.2 pptFound in 2 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS6.8 pptFound in 2 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- Lithium11.8 ppbFound in 2 of 4 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
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.
Copper
Found: Copper
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOS (a PFAS), PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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