“Geospatial data for EPA’s Office of Water Programs, including 303(d) Impaired Waters, 305(b) Waters As Assessed and Total Maximum Daily Loads (TMDLs) are available as prepackaged national downloads or as more current GIS web and and data services. EPA provides WATERS geospatial data in a variety of formats including Geographical Information Systems (GIS) compatible shapefiles and geodatabases, as well as ESRI and OGC web mapping services.” – EPA
EPA – Watershed Assessment, Tracking & Environmental Results System GIS Server
- Shapefile
- GDB/MDB
- REST Service