Source document
North Regional Water Fac, IL 2018 Consumer Confidence Report
The original annual drinking-water report. Every number on the North Regional Water Fac, IL water quality page is pulled from this document.
The North Regional Water Fac, IL figures for 2018 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the North Regional Water Fac, 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