Source document
Creston, IL 2016 Consumer Confidence Report
The original annual drinking-water report. Every number on the Creston, IL water quality page is pulled from this document.
The Creston, 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 Creston, 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