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Discharge Monitoring Report (DMR) Pollutant Loading Tool

Note: The tool uses discharge monitoring report (DMR) data from ICIS-NPDES to calculate pollutant discharge amounts. EPA has verified the accuracy of the tool’s calculations. EPA has also performed a limited review of the underlying data that has focused on facilities with the largest amounts of pollutant discharges. Due to the large amount of DMR data, additional errors exist in ICIS-NPDES. Please see the User Guide (29 pp, 2.6MB), Frequently Asked Questions and Answers, and Error Correction page for instructions on how to use the tool and how to correct errors in ICIS-NPDES. The tool also uses wastewater pollutant discharge data from the Toxics Release Inventory (TRI). You can send an email to waterloadings@epa.gov with any comments or questions about the tool. You can sign up for our e-mail news bulletin and be notified when new data, enhancements, or training materials are available.

Everyday Searches

Instructions. These “everyday” searches provide specialized search options that are not available using the EZ Search (DMR) or Advanced Search. These specialized searches use DMR data from PCS and ICIS-NPDES. For more information on using these Everyday Searches, refer to the Everyday Searches User Guide (PDF) (13 pp, 1.8MB).

Search EPA Lookup Tables. These look up tables provide an easy way to access information and the connections used by the Loading Tool. For example, you can use your zip code to find the name of your watershed.

Facility Loading Calculations. This search will allow you to review the exact monitoring data and formulas that the Loading Tool uses to calculate the annual estimates of pollutant discharge loading calculations for a single facility. This search is particularly useful for identifying potential data errors.

Loading Trends Charts. Search by geographic location, pollutant, and/or industry category and visually compare pollutant discharge amounts over multiple years.

Top Industrial Dischargers of Toxic Pollutants. This search provides a listing of the industrial sectors, grouped by EPA’s Effluent Guidelines Point Source Categories, by the cumulative amount of toxic pollutant discharges (in units of toxic-weighted pound equivalents or ‘TWPE’).

Exceedance and Load Over Limit Searches

Exceedance Charts. Search by geographic location, pollutant, and/or industry to visually compare the number of facilities with effluent limit exceedances and the magnitude of these exceedances (grouped as percentages over the effluent limit) over multiple years.

Facility Exceedance Counts. Using a facility name or unique identifier you can identify the months when a facility has exceeded its permitted effluent limit for each outfall at the facility.

Load Over Limit Summary. Search by year, geographic location, and/or industry to generate a data file showing facility information, the total facility load over effluent limit, top load over effluent limit parameter, and the parameter load over effluent limit for each reporting year.

Facility Counts and Summaries

Based on Pollutant Discharges. This search counts facilities, summarizes pollutant discharge amounts, and groups these data by state, pollutant, and industrial sector. You can search by year, geographic location, pollutant, and industry category. This search is particularly useful if you would like to count the number of facilities that have effluent discharges for a particular pollutant and group these counts by state or industrial sector.

Based on Permit Effluent Limits and Measurements. This search counts facilities, summarizes pollutant discharge amounts, and groups these data by state, pollutant, and industrial sector. You can search by year, geographic location, pollutant, and industry category. In addition, you can search on effluent limit type and amount. This search is particularly useful if you would like to count the number of facilities that have effluent limits for a particular pollutant and group these counts by state or industrial sector.

State Statistics and Loadings.

Hypoxia Task Force Searches

Nutrient Modeling. This search provides facility totals for aggregated nitrogen and aggregated phosphorus loads. The search includes nutrient loads calculated using DMR data as well as modeled nutrient loads for facilities that are likely to discharge Nitrogen and/or Phosphorus, but do not report Nitrogen or Phosphorus discharges on their DMRs.

Annual Loadings Report. This search provides aggregated nitrogen and aggregated phosphorus loads summed by State or Point Source Category. User may view Nitrogen and Phosphorus loads side by side for all facilities, or compare POTW and Non-POTW nitrogen or phosphorus loads. This search may also be used to generate statistics by state or point source category of facilities with permit limits and effluent monitoring requirements for nitrogen and phosphorus.

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