US Geological Survey
Usgs: National Water Quality Assessment Program
Use this website to find out about water quality issues anywhere in the U.S.A. where water studies have been conducted by the U.S. Geological Survey.
US Geological Survey
Usgs: Water Science for Schools Effects of Urbanization
This U.S. Geological Survey website offers a short article then lists topics that are linked to brief articles that describe that particular topic's effect on water quality in urban areas. Click Home to access the site in Spanish.