Source document
Ashkum, IL 2011 Consumer Confidence Report
The original annual drinking-water report. Every number on the Ashkum, IL water quality page is pulled from this document.
The Ashkum, IL figures for 2011 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Ashkum, 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