Water Pollutant Loading Tool - Resources

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General Resources and Fact Sheets


Help Documentation

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Technical Reference Documents

Geographic Information

Pollutant Information

Facility Program Flags

Note: See About Loading Tool Data for the last update dates for the lists below.

Industrial Classification

Bulk Downloads of DMR Data

The Custom Search allows users to create customized searches and access detailed DMR pollutant loadings information. Results are provided as a comma separated value (CSV) file for post-processing by the user.

In addition to the data downloads available throughout the Loading Tool, EPA provides access to DMR datasets through the following tools:

  • The ECHO Data Downloads provide ICIS-NPDES Permit Limits and Discharge Monitoring Report data sets for Clean Water Act permitted dischargers by year.
  • ECHO Effluent Charts provide downloads of DMR data for an individual facility, either for the entire facility or for specific outfalls and pollutants.

    Note that the Effluent Charts include DMR data that may not be displayed in the Loading Tool, such as data for internal monitoring locations and discharges related to wet-weather events (stormwater). For more information about the data in the Loading Tool, see DMR Data Scope and Limitations.

NPDES Program Information

Hypoxia Task Force Nutrient Model Information

Manual Corrections to DMR Data (by year)

Note: These files are updated weekly as part of the Loading Tool data refresh. As creation of these files is automated, the file sizes below are approximate.

DMR Data Manual Corrections: Data Element Descriptions
EXTERNAL_PERMIT_NMBRA 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_YEARThe calendar year of the pollutant discharge.
PERM_FEATURE_NMBRA 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_CODEA 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_DESIGNATORA 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_IDA 1-digit code to indicate one of four subdivisions of the year.
MONITORING_PERIOD_END_DATEThe end date (MM/DD/YYYY) of the monitoring period for the discharge.
PARAMETER_DESCThe description/parameter name that corresponds to the parameter code.
PARAMETER_CODEA 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_FIELDThe ICIS-NPDES measurement field (e.g., quantity or concentration field) of the manual correction.
OLD_VALUEThe original value of the data field from ICIS-NPDES.
NEW_VALUEThe corrected value of the data field.
CORR_DESCThe 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_CODEThe code used to classify the type of correction.
REVIEW_CYCLEThe general review cycle or date during which the data was reviewed and updated. Not Applicable (NA) indicates an automated correction. "Annual Review" refers to EPA's Effluent Guidelines Program review of industrial effluent discharges.


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