Source document
Oak Brook Estates, IN 1994 Consumer Confidence Report
The original annual drinking-water report. Every number on the Oak Brook Estates, IN water quality page is pulled from this document.
The Oak Brook Estates, IN figures for 1994 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Oak Brook Estates, IN 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