From the USGS National Analysis of Trace Elements, this new page offers a recent, much publicized map "that shows where and to what extent arsenic occurs in ground water across the country," a new fact sheet ("Arsenic in ground-water resources of the United States"), and a detailed report ("A retrospective analysis on the occurrence of arsenic in ground-water resources of the US and limitations in...

At this website, the Environmental Protection Agency (EPA) educates children about the United States' largest source of water contamination - non-point source pollution. Students can learn how they can prevent non-point source pollution in their homes and when taking part in recreational activities. Users can find a variety of educational games and activities such as developing a rain gauge. The...