Source document
North City, IL 2021 Consumer Confidence Report
The original annual drinking-water report. Every number on the North City, IL water quality page is pulled from this document.
The North City, IL figures for 2021 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the North City, 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