Source document
California Water Service - San Mateo, CA 2006 Consumer Confidence Report
The original annual drinking-water report. Every number on the California Water Service - San Mateo, CA water quality page is pulled from this document.
The California Water Service - San Mateo, CA figures for 2006 come from EPA's national Safe Drinking Water database (SDWIS / ECHO) — not a single utility-published PDF. Every value on the California Water Service - San Mateo, CA 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