Source document
Petrolia Pwd, IL 2011 Consumer Confidence Report
The original annual drinking-water report. Every number on the Petrolia Pwd, IL water quality page is pulled from this document.
The Petrolia Pwd, 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 Petrolia Pwd, 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