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.
Annenberg Foundation
Annenberg Learner: Garbage: Sewage
This concise article looks at the definition of sewage and the cost of treating waste water.
Annenberg Foundation
Annenberg Learner: Garbage: Sewage Solutions
A natural and less expensive approach to sewage treatment is discussed in this article about a California city that uses an artificial wetlands waste treatment plant.