GEIMS (Geographical Environmental Information Management System) is a public domain database that has been designed for the State of California to track environmental data and water resource information to assess the vulnerability of aquifer systems from point and nonpoint sources. GEIMS uses as its user interface a Web-based GIS tool called GeoTracker. With GeoTracker, public and private entities can access environmental data quickly and easily from any computer platform. The user then has the option to download the relevant data for more advanced analysis or use the online analysis tools for a rapid assessment. GEIMS and GeoTracker have the capabilities to dramatically transform data analysis and to act as a focal point for the accumulation of environmental knowledge that will become increasingly necessary as water resources become scarcer in the future.