We read 20 results from Aquarion-Eastern Fairfield County’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 351,756 people · Water system ID CT0150011 · 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 homes tested, 2 over the action level · Customer taps · 2025 report, page 3 | 2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal10x the health goal |
| PFOA (a PFAS)average · range 4 to 8 · System · 2025 report, page 5 | 6 ppt | 0.007 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.5x 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 4 to 5 · System · 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 0.01 to 0.06 · System · 2025 report, page 3 | 0.01 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 21 to 48 · Distribution system · 2025 report, page 4 | 25 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.01 to 1.64 · Distribution system · 2025 report, page 3 | 0.78 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | 0.1 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 21 to 49 · Distribution system · 2025 report, page 4 | 40 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 26 to 73 · Distribution system · 2025 report, page 4 | 55 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.48 to 0.96 · System · 2025 report, page 3 | 0.71 ppm | 1 ppm | 4 ppm | Below the health goal |
| Manganeseaverage · range ND to 0.14 · System · 2025 report, page 5 | 0.02 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)average · range ND to 1.3 · System · 2025 report, page 3 | 0.13 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHaverage · range 7 to 8 · Distribution system · 2025 report, page 4 | 7.4 | — | — | Normal range |
| Radium (combined 226 + 228)average · range ND to 1.06 · System · 2025 report, page 3 | Not detected | 0 pCi/L | 5 pCi/L | Not detected |
| Sulfateaverage · range 12 to 25 · Distribution system · 2025 report, page 4 | 19 ppm | — | 250 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest monthly average · range 0.03 to 0.22 · Surface water treatment plant · 2025 report, page 3 | 0.05 NTU | None set | 1 NTU | Below the legal limit |
| Hardnessaverage · range 2 to 5 · System · 2025 report, page 5 | 3 gpg (51.3 ppm) | — | — | Soft |
| PFBS (a PFAS)average · range 2 to 4 · System · 2025 report, page 5 | 3 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range ND to 5 · System · 2025 report, page 5 | 2 ppt | None set | None | No health limit |
| Sodiumaverage · range 16 to 44 · Distribution system · 2025 report, page 4 | 19 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-Eastern Fairfield County’s water between Jan 2023 and Feb 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA10.9 pptFound in 3 of 14 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS6.6 pptFound in 2 of 14 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFBS4.1 pptFound in 1 of 14 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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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