What Are Ecosystem Services? What Is Water Purification? • Streamside (Riparian) Plant Communities • Wetlands • Hydrology Pollutants and How They Are "Purified" • Nutrients • Pesticides and Herbicides • Pathogens • Salt, Sand, Petrochemicals and Heavy Metals • Excessive Sedimentation • Thermal Pollution Can We Put a Value on Water Purification? • Replacement Cost • Wastewater Treatment • Constructed Wetlands • Chemical Cleaners • Health • Recreation/Quality of Life

What Are the Threats? What Are the Solutions? • Pollution • Water Diversion • Wetland and Riparian Zone Loss • Riparian Areas • Resources • Planning Research Needs Conclusions Sources

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