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The U. S. EPA Nutrient Criteria Program developed a prototype Web-based database (NUTDB) and ArcIMS mapping application to support states and tribes in developing nutrient criteria recommendations for surface waters. Monitoring station nutrient data were compiled from multiple sources (EPA Legacy STORET, USGS, and others through EPA Regional Offices). Approximately 65,000 monitoring stations were batch georeferenced to the National Hydrography Dataset (NHD) through multiple methods, discussed in this paper along with results. Linking nutrient data to the NHD allows geospatial interoperability with national environmental databases and facilitates query and display of water-related nutrient data and analyses, such as a station's upstream/downstream relation to discharge points. The ArcIMS application uses multiple layers, including the USGS National Elevation Data (NED), National Land Cover Data (NLCD), and ortho-photography. The paper discusses how the current prototype utilizes comprehensive nutrient data and map layers for the Maryland, Virginia, and the District of Columbia pilot study area.