PBS
Pbs Learning Media: Environmental Public Health: Human Impact on Water Quality
In this lesson, students explore human impact on water resources, investigate the quality of their community's water supply, and consider ways to clean up and avoid further pollution. (Note: Some of the links may no longer work and...
Better Planet Productions
Earth Care: Filter It Down [Pdf]
Students will investigate how different materials filter water and learn about water treatment.
Other
Encyclopedia of Desalination and Water Resources
Informational site describes the process of water desalination and distillation. Also provides a list of free articles to peruse for further study.
American Geosciences Institute
American Geosciences Institute: How Is Drinking Water Cleaned?
Get an overview of how water is treated in order to be safe to use and drink.
CK-12 Foundation
Ck 12: Earth Science: Safety of Water Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide summarizes key points about water quality. Includes a few questions to check for understanding.