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.