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