Source document
Tonkawa, OK 2014 Consumer Confidence Report
The original annual drinking-water report. Every number on the Tonkawa, OK water quality page is pulled from this document.
The Tonkawa, OK figures for 2014 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Tonkawa, 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