Source document
United School District 304, IL 2015 Consumer Confidence Report
The original annual drinking-water report. Every number on the United School District 304, IL water quality page is pulled from this document.
The United School District 304, IL figures for 2015 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the United School District 304, 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