ZIP 01876: your water comes from Tewksbury Water Department
Tewksbury Water Department is the only community water system that reports serving ZIP 01876 (Essex County and Middlesex County, Massachusetts) under EPA's UCMR 5. PFAS-4 at the latest sample (2024): 5 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.