Source document
Hyannis Water System, Town of Barnstable, MA 2025 Consumer Confidence Report
The original annual drinking-water report. Every number on the Hyannis Water System, Town of Barnstable, MA water quality page is pulled from this document.
The Hyannis Water System, Town of Barnstable, MA figures for 2025 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Hyannis Water System, Town of Barnstable, MA water quality page is transcribed from that public dataset, and you can verify it against the same source below.
View the source dataset ↗https://echo.epa.gov/tools/data-downloads/sdwa-download-summary