Source document

Mason County Public Works, WA 2025 Consumer Confidence Report

The original annual drinking-water report. Every number on the Mason County Public Works, WA water quality page is pulled from this document.

The Mason County Public Works, WA figures for 2025 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Mason County Public Works, WA 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