Source document
Coulee Dam Water Dept, WA 2023 Consumer Confidence Report
The original annual drinking-water report. Every number on the Coulee Dam Water Dept, WA water quality page is pulled from this document.
The Coulee Dam Water Dept, WA figures for 2023 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Coulee Dam Water Dept, 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