Source document
Balko School, OK 2013 Consumer Confidence Report
The original annual drinking-water report. Every number on the Balko School, OK water quality page is pulled from this document.
The Balko School, OK figures for 2013 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Balko School, 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