Source document
Cooks Mills Water Association, IL 2015 Consumer Confidence Report
The original annual drinking-water report. Every number on the Cooks Mills Water Association, IL water quality page is pulled from this document.
The Cooks Mills Water Association, IL figures for 2015 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Cooks Mills Water Association, 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