ZIP 02637: your water comes from Barnstable Fire District
Barnstable Fire District is the only community water system that reports serving ZIP 02637 (Barnstable, Barnstable County, Massachusetts) under EPA's UCMR 5 (reported by the system to EPA). PFAS-4 at the latest sample (2023): 4.9 ng/L. 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.