Source document
Glen Ellyn Heights Subdivision, IL 2017 Consumer Confidence Report
The original annual drinking-water report. Every number on the Glen Ellyn Heights Subdivision, IL water quality page is pulled from this document.
The Glen Ellyn Heights Subdivision, IL figures for 2017 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Glen Ellyn Heights Subdivision, 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