Source document
Clark, SD 2023 Consumer Confidence Report
The original annual drinking-water report. Every number on the Clark, SD water quality page is pulled from this document.
The Clark, SD figures for 2023 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Clark, SD 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