Source document
Frederick, OK 1993 Consumer Confidence Report
The original annual drinking-water report. Every number on the Frederick, OK water quality page is pulled from this document.
The Frederick, OK figures for 1993 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Frederick, OK 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