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