Source document
Grass Lake School, IL 2003 Consumer Confidence Report
The original annual drinking-water report. Every number on the Grass Lake School, IL water quality page is pulled from this document.
The Grass Lake School, IL figures for 2003 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Grass Lake School, IL 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