The Internet Watershed Educational Tool (InterWET) was developed to help educate local officials and other concerned citizens about water resources. InterWET gives a technical and multi-perspective response to local watershed issues, using as a case study the Spring Creek Watershed in central Pennsylvania. InterWET can be used as a stand-alone educational resource and as part of larger watershed educational efforts for a variety of people in many different watersheds. InterWET consists of a set of web pages that present the water resources issues of surface runoff, groundwater, sediment, in-stream nutrients, and fish populations from the perspectives of a researcher, a conservationist, and a local official. Each web page has a short lesson which uses an interactive calculator or interactive map. These lessons are meant to increase the knowledge and understanding of the learner. InterWET was designed as solely an educational tool. The calculators, maps, and monitoring data developed and used in InterWET are based on many assumptions and should not be used for local planning or policy. Actual planning and policy, however, may make use of the original source data sets, which are listed throughout InterWET.