Source document
West Oak Middle School, IL 2017 Consumer Confidence Report
The original annual drinking-water report. Every number on the West Oak Middle School, IL water quality page is pulled from this document.
The West Oak Middle School, IL figures for 2017 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the West Oak Middle 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