Source document
Longdale, OK 2020 Consumer Confidence Report
The original annual drinking-water report. Every number on the Longdale, OK water quality page is pulled from this document.
The Longdale, OK figures for 2020 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Longdale, 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