ZIP 02557: your water comes from Oak Bluffs Water District
Oak Bluffs Water District is the only community water system that reports serving ZIP 02557 (Oak Bluffs, Dukes County, Massachusetts) under EPA's UCMR 5. PFAS-4 at the latest sample (2023): 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.