ZIP 01904: your water comes from Lynn Water and Sewer Comm
Lynn Water and Sewer Comm is the only community water system that reports serving ZIP 01904 (Lynn, Essex County, Massachusetts) under EPA's UCMR 5 (reported by the system to EPA). PFAS-4 at the latest sample (2023): 4.7 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.