Source document
Mc Lean, IL 2019 Consumer Confidence Report
The original annual drinking-water report. Every number on the Mc Lean, IL water quality page is pulled from this document.
The Mc Lean, IL figures for 2019 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Mc Lean, 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