State Statistics

The State Statistics downloads summarize, by state and EPA region, the counts and magnitude of pollutant loadings for major and minor (non-major) NPDES permittees during a calendar year.  State statistics are available to download as CSV files and are updated weekly. 

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


Data Dictionary

Reporting Year
The calendar year of the reported pollutant discharges. The Water Pollutant Loading Tool calculates annual pollutant loadings from DMR data reported for monitoring periods within a calendar year.
EPA Region
The EPA designated area that U.S. States, territories, and tribes are assigned to. There are 10 EPA regions.
Number of Majors in ICIS-NPDES
THe number of NPDES permits with major designations.
Number of Minors in ICIS-NPDES
THe number of NPDES permits with minor designations.
Percent of Majors with Pollutant Loadings
The percent of all NPDES permits with major designations in a state with pollutant loadings greater than zero.
Percent of Minors with Pollutant Loadings
The percent of all NPDES permits with minor designations in a state with pollutant loadings greater than zero.
Total Pollutant Loading (lb/year) for Majors
The total calculated pollutant loadings, in pounds per year, for all NPDES permits with major designations.
Total Pollutant Loading (lb/year) for Minors
The total calculated pollutant loadings, in pounds per year, for all NPDES permits with minor designations.
Total Toxic-Weighted Pounds (lb-eq/year) for Majors
The total calculated relative toxicities of pollutant loadings, as toxic-weighted pound equivalents per year, for NPDES permits with major designations.
Total Toxic-Weighted Pounds (lb-eq/year) for Minors
The total calculated relative toxicities of pollutant loadings, as toxic-weighted pound equivalents per year, for NPDES permits with minor designations.

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