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By Environmental Health Program 2011 (approx.)

Wells shown as red, black, gray, and white dots within Pennsylvania

Detailed Description

Location of selected wells in Pennsylvania that have been tested for arsenic. The solid red dots are wells with arsenic concentrations greater than or equal to 4 parts per billion. (Data sources: USGS Data Series 150 and USGS Data Series 314)

Sources/Usage

Public Domain.