Water quality by county
in Connecticut
EPA sampled public water systems across Connecticut for PFAS under its UCMR 5 programme. Of the 8 counties, 8 have a reading above a federal limit and 0 have not been sampled at all — which is not a clean result, only an absence of one. Each county below shows what was found, at what concentration, and at which utility.
| county | Population | Worst result | Compound |
|---|---|---|---|
| New London County | 282,602 | 4.0× | PFOS · 16.2 ng/L |
| Hartford County | 991,508 | 4.0× | PFOS · 16 ng/L |
| Fairfield County | 637,013 | 4.0× | PFOA · 15.9 ng/L |
| New Haven County | 576,718 | 3.5× | PFOS · 13.9 ng/L |
| Windham County | 97,701 | 2.5× | PFOA · 9.9 ng/L |
| Litchfield County | 114,101 | 1.3× | PFOA · 5.3 ng/L |
| Tolland County | 991,508 | 1.3× | PFOS · 5 ng/L |
| Middlesex County | 177,540 | 1.1× | PFOS · 4.6 ng/L |