Discharge Monitoring Report (DMR) Pollutant Loading Tool
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Note: The tool uses discharge monitoring report (DMR) data from ICIS-NPDES and PCS to calculate pollutant discharge amounts. EPA has verified the accuracy of the tool’s calculations. EPA has also performed a limited review of the underlying data that has focused on facilities with the largest amounts of pollutant discharges. Due to the large amount of DMR data, additional errors exist in ICIS-NPDES and PCS. Please see the User Guide (29 pp, 2.6MB), Frequently Asked Questions and Answers, and Error Correction page for instructions on how to use the tool and how to correct errors in ICIS-NPDES and PCS. You can send an email to email@example.com with any comments or questions about the tool. You can sign up for our e-mail news bulletin and be notified when new data, enhancements, or training materials are available. The tool also uses wastewater pollutant discharge data from the Toxics Release Inventory (TRI).
About the Data
The Loading Tool uses discharge monitoring and permit data from PCS and ICIS-NPDES. PCS and ICIS-NPDES are databases that automate entering, updating, and retrieving discharge monitoring and permit data.
Dischargers submit discharge monitoring data to their permitting authority using discharge monitoring report (DMR) forms. The permitting authority then enters these data into PCS or ICIS-NPDES and checks whether the discharger is in compliance with the NPDES permit requirements. Facilities report pollutant discharge monitoring data in their DMR as mass-based quantities (e.g., pounds per day) and/or concentrations (e.g., mg/L); however, discharges are reported using a wide variety of units.
Permit data include NPDES permit limits for water quality parameters (e.g., dissolved oxygen and temperature), specific chemicals (e.g., phenol), bulk parameters (e.g., biochemical oxygen demand), and flow. The permitting authority enters these data into PCS or ICIS-NPDES. PCS and ICIS-NPDES also include information on the facility’s permit requirements, such as monitoring frequency.
- PCS and ICIS-NPDES are national in scope, including data from all 50 states and 21 U.S. territories and tribes;
- PCS and ICIS-NPDES contain discharge data that facilities determine through effluent chemical analyses and metered flow; and
- PCS and ICIS-NPDES collectively include information for facilities in all point source categories that discharge directly to receiving streams.
Other data sources used by the Loading Tool include:
- Watershed Assessment Tracking and Environmental ResultS (WATERS) Web services for retrieving information about receiving waterbodies;
- 2008 Clean Watershed Needs Survey (CWNS) for providing information about treatment technologies in place at municipal wastewater treatment plants; and
- Facility Registry System (FRS) for providing facility location information and linking PCS and ICIS-NPDES facilities to other EPA programs, such as the Toxics Release Inventory (TRI).
Read about the Loading Tool data limitations
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