Source document
Oak Ridge Sanitary District, IL 1997 Consumer Confidence Report
The original annual drinking-water report. Every number on the Oak Ridge Sanitary District, IL water quality page is pulled from this document.
The Oak Ridge Sanitary District, IL figures for 1997 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Oak Ridge Sanitary District, 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