Source document
Sheffield Water Supply, IA 2025 Consumer Confidence Report
The original annual drinking-water report. Every number on the Sheffield Water Supply, IA water quality page is pulled from this document.
The Sheffield Water Supply, IA figures for 2025 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the Sheffield Water Supply, IA 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