Nitrogen and Phosphorus Pollution Data Access Tool

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NPDAT2 graph.JPG 

The EPA Nitrogen and Phosphorus Pollution Data Access Tool (NPDAT) is a Web-based tool intended to help states develop effective strategies for reducing nitrogen and phosphorus pollution. The NPDAT consists of an introductory website, geospatial viewer, and data download tables available at

Data available on the NPDAT include:
• Nitrogen and Phosphorus Loading information from U.S. Geological Survey SPARROW model (SPAtially Referenced Regressions On Watershed attributes)
• Water Quality Data and Information (e.g., Water quality monitoring sites with nitrogen and phosphorus data and National Aquatic Resource Surveys (NARS) Phosphorus/ Nitrogen Values data layers)
• Setting Watershed Load Reduction Goals / Source Control Priorities (e.g., Facilities that are likely to discharge nitrogen and phosphorus to water, waters with N/P TMDLs [Total Maximum Daily Loads], and drinking water sources.)