Source document
Portage, MI 1999 Consumer Confidence Report
The original annual drinking-water report. Every number on the Portage, MI water quality page is pulled from this document.
The Portage, MI figures for 1999 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Portage, MI 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