Source document
Dowell, IL 2018 Consumer Confidence Report
The original annual drinking-water report. Every number on the Dowell, IL water quality page is pulled from this document.
The Dowell, IL figures for 2018 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Dowell, 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