The Environmental Protection Agency has released data from the third annual National Health Protection Survey of Beaches for the 1999 swimming season. Based on voluntarily returned surveys, the site offers information on water quality at 1,891 beaches in the US. Using an interactive map, users can find out if the water at a selected beach is being monitored, who is responsible for monitoring, and...

Announced in May 2001 by the US Geological Survey (USGS), this site provides access to water-resources data collected at approximately 1.5 million sites in all 50 states, the District of Columbia, and Puerto Rico. The data is accessed via several categories, including real-time, surface water, ground water, and water quality. Within each section, users have multiple options to narrow their...