Source document
Dover, IL 2012 Consumer Confidence Report
The original annual drinking-water report. Every number on the Dover, IL water quality page is pulled from this document.
The Dover, IL figures for 2012 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Dover, 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