Groundwater Contamination: The contamination of groundwater, which supplies drinking water for one-third of the U.S. population and half of Michigan’s residents, is a serious health and environmental problem. During this investigation you will learn about the sources and impacts of groundwater contamination, how groundwater (an unseen resource) contamination is investigated, and some possible ways to clean up and prevent groundwater. Students engage in a groundwater contamination investigation to determine the size, direction of flow and rate of movement of a contamination plume. Supports water unit lesson 5.