DMR pollutant loadings are calculated in pounds per year (lb/year) based on pollutant measurement data from Discharge Monitoring Reports for facilities discharging wastewater under the National Pollutant Discharge Elimination System (NPDES) Program. This information can be used to help identify discharges that may have the greatest impact on the environment. For more information, read the Water Pollutant Loading Tool Frequently Asked Questions.

The load over limit is the difference between the pollutant load and the permit limit for each monitoring period and pollutant, summed over the calendar year. To learn more about how pollutant loadings and load over limit (option 1) are calculated, see Hierarchy of Loading Calculations.

Conventional loadings are the sum of pollutant loadings (lb/year) for reported measurements of biochemical oxygen demand, total suspended solids, and oil and grease. Conventional pollutants are defined by Federal Regulation [40 CFR 401.16]. Fecal coliform and pH measurements are not converted to loadings.

Pollutant discharges are reported in pounds and toxic-weighted pound equivalent (lb-eq/year). EPA calculates toxic-weighted loadings using DMR data and pollutant specific toxic weighting factors in order to rank the relative toxicities of different pollutant discharges. Values are not a measure of risk or potential for human health impacts. Toxic weighting factors were developed by the EPA Effluent Guidelines Program.

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