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