ZIP 48879: your water comes from St. Johns, City of
St. Johns, City of is the only community water system that reports serving ZIP 48879 (Clinton County and Gratiot County, Michigan) under EPA's UCMR 5 (reported by the system to EPA). PFAS-4 at the latest sample (2025): 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.