ZIP 02639: your water comes from Dennis Water District
Dennis Water District is the only community water system that reports serving ZIP 02639 (Barnstable County, Massachusetts) under EPA's UCMR 5 (reported by the system to EPA). PFAS-4 at the latest sample (2024): below the 3 to 4 ng/L reporting limit. Systems report their own ZIP lists to EPA; if your water bill names another utility, that utility's page carries its own results.
Where this ZIP is
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.