U.S. Fish & Wildlife ServiceThe U.S. Fish and Wildlife Service (USFWS) is the principal Federal agency that provides information to the public on the extent and status of the Nation's wetlands. As of May of 2014, the National Wetlands Inventory (NWI) wetland geospatial data layer provides on-line map information for all of the conterminous U.S., Hawaii, Puerto Rico, the Virgin Islands, Guam, the major Northern Mariana Islands and 40% of Alaska. This was accomplished by working with numerous Federal, State, and Tribal agencies as well as various universities and non-governmental organizations. The NWI Program works with these entities to ensure all data meets the federal wetland mapping standard before it get's added into the national wetlands layer. Active mapping projects once completed and pass all NWI QAQC measures are added to the national data layer, and are posted the Wetlands Mapper.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/cc7cd52114b44360bae5883f50fe8a1e_0engU.S. Fish and Wildlife Service Open DataPublicFWS HQ ES National Wetlands Inventory Active Projects [United States]Web servicesUnited StatesLast Modified: 2025-05-08