Source document

Columbia, IL 2023 Consumer Confidence Report

The original annual drinking-water report. Every number on the Columbia, IL water quality page is pulled from this document.

The Columbia, IL figures for 2023 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Columbia, 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