Source document
Oak Forest, IL 2004 Consumer Confidence Report
The original annual drinking-water report. Every number on the Oak Forest, IL water quality page is pulled from this document.
The Oak Forest, IL figures for 2004 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Oak Forest, 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