The State Statistics aggregate data from the Water Pollution Search to provide counts and magnitude of pollutant loadings for individual NPDES permits (i.e., having permit type "individual") during a calendar year by state and EPA region.
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 individual NPDES permits (permit type = individual) with major designations.
Number of Non-Majors in ICIS-NPDES
The number of individual NPDES permits with non-major designations.
Percent of Majors with Pollutant Loadings
The percent of individual NPDES permits with major designations in a state with pollutant loadings greater than zero.
Percent of Non-Majors with Pollutant Loadings
The percent of individual NPDES permits with non-major 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 individual NPDES permits with major designations.
Total Pollutant Loading (lb/year) for Non-Majors
The total calculated pollutant loadings, in pounds per year, for individual NPDES permits with non-major 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 individual NPDES permits with major designations.
Total Toxic-Weighted Pounds (lb-eq/year) for Non-Majors
The total calculated relative toxicities of pollutant loadings, as toxic-weighted pound equivalents per year, for individual NPDES permits with non-major designations.