Water Pollutant Loading Tool Modernization

Last Updated: December 12, 2017

The Water Pollutant Loading Tool (Loading Tool) is a public access website designed to help you determine who is discharging, what pollutants they are discharging and how much, and where they are discharging. The Loading Tool calculates pollutant loadings from permit and DMR data from EPA's Integrated Compliance Information System for the National Pollutant Discharge Elimination System (ICIS-NPDES). Data are available from the year 2007 to the present.

The Loading Tool is being transitioned into ECHO to increase user access to data and streamline site maintenance.

EPA plans to retire the legacy site (https://cfpub.epa.gov/dmr/) in December 2017.

Site Navigation


Water Pollution Search
Streamlined combination of EZ Search, TRI Search, and Facility Search.


Data Downloads
Access features that generate files for download, such as Custom Search and NPDES Permit Fact Sheets.


Everyday Searches
Specialized tools and features. 

Access help information and technical documentation.

Snapshot of help content.

Features Available in Version 1.0 Release


  • Streamlined and consistent design, using ECHO design template
  • Data provided via publicly available web services (documentation coming soon)
  • Improved search speed and performance
  • Simplified navigation tabs within the Loading Tool to enable quick access across features and resources
  • Many features and pages (e.g., search forms, reports, etc.) have unique aliases and may be accessed via direct URL calls
  • Expanded help documentation
ECHO Feature ECHO Navigation Tab Legacy Feature Notes about changes and improvements
Water Pollution Search Water Pollution Search EZ Search Water Pollution Search default search type is DMR.
TRI Search Select search type "TRI" to search for TRI direct and indirect discharge data.
Facility Search Search functionality, such as ability to search by Facility ID, incorporated into the Water Pollution Search.
Custom Search Data Downloads Advanced Search Reorganized search form and improved search speed and performance.
TRI and DMR Comparison Dashboard Everyday Searches TRI and DMR Comparison Dashboard Charts refresh automatically when selecting a metric.
Pollutant Loading Report (DMR) N/A Facility Information (DMR)

Available via "L" report icons throughout ECHO: CWA Pollutant Loading Report

Incorporates loading calculation drilldowns.

Example report: https://echo.epa.gov/trends/loading-tool/reports/dmr-pollutant-loading?p... 

NPDES Permit Limit and Monitoring Requirements Report N/A View Permit Limits and Monitoring Requirements Available via "P" icon in Loading Tool: Permit Limits Icon

Summary information added to link to other reports. Users may also change the year of data displayed. Improved format and functionality of table and download.
Pollutant Loading Report (TRI) N/A Facility Information (TRI) Example report: https://echo.epa.gov/trends/loading-tool/reports/tri-pollutant-loading?p...
NPDES Permit Fact Sheet Data Downloads Permit Fact Sheet Tables Improved spreadsheet formatting. Available via "F" report icon in Loading Tool: Permit Fact Sheet Icon
Nutrient Modeling (Hypoxia Task Force Search) Everyday Searches Nutrient Modeling Retained legacy functionality and updated formatting.
Annual Loadings (Hypoxia Task Force Search) Everyday Searches Annual Loadings Report Transition in progress. See release notes for expected availability of full functionality.
DMR and TRI Multi-Year Loading Report N/A Facility Multi-Year Loading Report Available via "M" report icon in Loading Tool: Multi-Year Loading Report Icon
Effluent Limit Exceedances Report N/A Effluent Limit Exceedances Report

Available via "X" report icons throughout ECHO:  Effluent Limit Exceedances Report Icon

Example report: https://echo.epa.gov/trends/loading-tool/reports/effluent-exceedances/?p...

Watershed Statistics Everyday Searches Watershed Statistics and Loadings Retained legacy functionality and updated formatting.

Availability of Other Features

Some features are temporarily unavailable in the new site, but will be added incrementally to the modernized Loading Tool. Dates are subject to change.

Note that in the table below, direct links are provided to the legacy site where available. Many of the features listed without hyperlinks are available through Everyday Searches.

Feature Anticipated Availability Date
State Statistics December 2017
Indirect Industrial Discharge Report Early 2018
Compare DMR and TRI Features in Water Pollution Search Results Early 2018
Effluent Limit Exceedances Search Early 2018
Top Industrial Dischargers of Toxic Pollutants Early 2018
Exceedance Charts Under consideration
Loading Trends Charts Under consideration
Load over Limit Summary Under consideration
Lookup Tables Under consideration
Data Explorer Discontinued
Facility Exceedance Counts Discontinued

Future Enhancements

The following data and functionality are planned for future releases:

  • Video tutorials for the TRI and DMR Comparison Dashboard
  • Web service documentation
  • National download files
  • Automated weekly updates of reference files

Please let us know if you have suggestions for additional features for the Loading Tool.

Frequently Asked Questions

Answers to questions will be posted below during the Loading Tool transition into ECHO.

Will notice be given as features are added in ECHO?
Yes. EPA will update this page and send emails to the Water Pollutant Loading Tool News list as features become available.
Will there be webinars to train users on how to use the Loading Tool?
EPA will offer online training for the modernized Loading Tool in the future. Visit ECHO Training for announcements and registration information for upcoming webinars and recordings of past webinars.

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