DMR Loading Tool Data Downloads

The Discharge Monitoring Report (DMR) Pollutant Loading Tool (beta) is designed to help you determine who is discharging, what pollutants they are discharging and how much, and where they are discharging. The 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 DMR Loading Tool data downloads provide access to data and reference information supporting the pollutant loading calculations. Additional reference information is available on the DMR Loading Tool Technical Support Documents page.

Reference Information


Pollutant Information

Hypoxia Task Force Nutrient Model Information

Technical Background Information for DMR Pollutant Loading Calculations


Manual Corrections to DMR Data (by year)

Note: as creation of these files is automated, the file sizes below are approximate.

  • 2015 (coming soon)
  • 2016 (coming soon)
  • 2017 (coming soon)
DMR Data Manual Corrections: Data Element Descriptions
Element Description
EXTERNAL_PERMIT_NMBR A nine-character code used to uniquely identify a permitted NPDES facility (NPDES ID). The NPDES permit program regulates the direct discharge of pollutants into U.S. waters.
DMR_YEAR The calendar year of the pollutant discharge.
PERM_FEATURE_NMBR A four-character code in ICIS-NPDES that identifies the point of discharge (e.g., outfall) for a facility. A NPDES permit may have multiple points of discharge.
MONITORING_LOCATION_CODE A single-character code in ICIS-NPDES that indicates the sampling location for each pollutant measurement. The Loading Tool only includes locations for effluent sampling points. These include: 
  • 1 -- Effluent gross discharge
  • 2 -- Effluent net discharge
  • A -- After disinfection
  • B -- Before disinfection, and
  • SC -- See Comments.
LIMIT_SET_DESIGNATOR A single-character code in ICIS-NDPES that groups limits that are set on a similar basis (e.g., monthly, annual, or seasonal limits). A limit set designator code is provided for each DMR measurement and limit.
LIMIT_SEASON_ID A 1-digit code to indicate one of four subdivisions of the year.
MONITORING_PERIOD_END_DATE The end date of the monitoring period for the discharge.
PARAMETER_DESC The description/parameter name that corresponds to the parameter code.
PARAMETER_CODE A five-character code in ICIS-NDPES that identifies the regulated pollutant parameter in a NPDES permit and specifies both the pollutant name and pollutant form (e.g., dissolved or suspended). Multiple parameters can apply to a single pollutant or CAS number.
DATA_FIELD The ICIS-NPDES measurement field (e.g., quantity or concentration field) of the manual correction.
OLD_VALUE The original value of the data field from ICIS-NPDES.
NEW_VALUE The corrected value of the data field.
CORR_DESC The description of the Correction Type Code. See Section 3.1 of the Technical Users Background Document for more information about corrections to DMR data.
CORRECTION_TYPE_CODE The code used to classify the type of correction.
REVIEW_CYCLE The general review cycle or date during which the data was reviewed and updated. Not Applicable (NA) indicates an automatic correction. "Annual Review" refers to EPA's Effluent Guidelines Program annual review of industrial effluent discharges.


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