Using web maps such as the EPA’s WATERS GeoViewer and EnviroAtlas or the US Geological Survey’s Stream Stats or National Map, you can learn a wealth of information related to a stream or watershed. Jon Becker of EPA will explain the features of these web maps and their map layers such as permitted dischargers, waters designated as impaired, land cover classifications and much more. They also provide analytical tools which can calculate the drainage area that flows to a given point and summarize numerous environmental databases for that area. These easy-to-use tools can help you better understand what may be impacting water quality at a monitoring site. If time allows, we’ll also cover some other emerging EPA data sets and analytical tools related to water quality and watershed characterization.