Source document
Cardwell School Dist 16 and 31, MT 2019 Consumer Confidence Report
The original annual drinking-water report. Every number on the Cardwell School Dist 16 and 31, MT water quality page is pulled from this document.
The Cardwell School Dist 16 and 31, MT figures for 2019 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Cardwell School Dist 16 and 31, MT 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