Source document
Irving, IL 2016 Consumer Confidence Report
The original annual drinking-water report. Every number on the Irving, IL water quality page is pulled from this document.
The Irving, IL figures for 2016 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Irving, 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