Source document
Ironwood, MI 1992 Consumer Confidence Report
The original annual drinking-water report. Every number on the Ironwood, MI water quality page is pulled from this document.
The Ironwood, MI figures for 1992 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Ironwood, 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