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Groundwater is the source of about 40 percent of our potable water, and thus it is important for many households, farms, manufacturing, and other processes. In some places groundwater is contaminated, or at risk of contamination. In many placed it is being used at rates faster than it is being recharged. How do we manage groundwater? What are the risks that it faces, and what can we do about them?In this podcast we talk with Dr. Bill Alley, Director of Science and Technology, for the National Ground Water Association