Recent Additions: Nitrogen and Phosphorus Pollution Data Access Tool

This page provides an overview of new additions to the Nitrogen and Phosphorus Pollution Data Access Tool. To receive update emails (no more than a few per year) on new data added to the Data Access Tool, please contact npdat-hq@epa.gov.

May 14, 2014

  • EPA Adds American Indian Tribal Lands Boundaries to NPDAT
    American Indian Tribal Lands Boundaries have been added to the NPDAT. This layer represents locations of American Indian tribal lands in the lower 48 states. The areas include all lands associated with federally recognized tribal entities -- federally recognized reservations, off-reservation trust lands, and Census Oklahoma Tribal Statistical Areas.
  • Updated Data on Waters Listed for N/P Impairments and Waters with N/P TMDLs
    The data layers with Waters Listed for N/P Impairments and Waters with N/P TMDLs [Total Maximum Daily Loads] now reflect data pulled from the Assessment TMDL Tracking and ImplementatioN System (ATTAINS) as of February 2014 (previously the layers reflected January 2013 ATTAINS data).
  • Updated Data on National Pollutant Discharge Elimination System (NPDES) Concentrated Animal Feeding Operations (CAFO) Summary
    The data layer on NPDES CAFO Summary now reflects data reported by EPA Regions as of December 31, 2012 (previously the summary reflected data reported in 2010).

September 27, 2013

  • Updated Data on Facilities Likely to Discharge N/P to Water
    The Facilities Likely to Discharge Nitrogen/Phosphorus (N/P) to Water data layer now provides information on nitrogen and phosphorus discharge and any nitrogen and phosphorus permit limits from 2011 facility monitoring reports (previously 2010 information was the most current information available through the Nitrogen and Phosphorus Pollution Data Access Tool) . These data are retrieved using EPA's Discharge Monitoring Report (DMR) Pollutant Loading Tool.
  • Updated Data on Waters Listed for N/P Impairments and Waters with N/P TMDLs
    The data layers with Waters Listed for N/P Impairments and Waters with N/P TMDLs [Total Maximum Daily Loads] now reflect data pulled from the Assessment TMDL Tracking and ImplementatioN System (ATTAINS) as of January 2013 (previously the layers reflected May 2012 ATTAINS data).

October 12, 2012

  • Updated Data javascript:void(0);on Facilities Likely to Discharge N/P to Water
    The Facilities Likely to Discharge Nitrogen/Phosphorus (N/P) to Water data layer now provides information on nitrogen and phosphorus discharge and any nitrogen and phosphorus permit limits from 2010 facility monitoring reports (previously 2008 information was the most current information available through the Nitrogen and Phosphorus Pollution Data Access Tool) . These data are retrieved using EPA's Discharge Monitoring Report (DMR) Pollutant Loading Tool.
  • Updated Data on Waters Listed for N/P Impairments and Waters with N/P TMDLs
    The data layers with Waters Listed for N/P Impairments and Waters with N/P TMDLs [Total Maximum Daily Loads] now reflect data pulled from the Assessment TMDL Tracking and ImplementatioN System (ATTAINS) as of May 2012 (previously the layers reflected November 2011 ATTAINS data).

February 17, 2012

January 31, 2012

December 23, 2011

  • EPA Adds Updated SPARROW data to the Data Access Tool
    USGS recently completed syntheses of the results from 12 independently calibrated regional-scale SPARROW models that describe water quality conditions throughout Major River Basins of the conterminous U.S. based on nitrogen and phosphorus sources from 2002. Two data layers - one for nitrogen and one for phosphorus – now provide an approximate yet regionally consistent synthesis of the locations of the largest contributing sources.