ZIP 17339: your water comes from PA American Water CO West
PA American Water CO West is the only community water system that reports serving ZIP 17339 (York County, Pennsylvania) under EPA's UCMR 5 (reported by the system to EPA). PFAS-4 at the latest sample (2024): 6.2 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.