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Discharge Monitoring Report (DMR) Pollutant Loading Tool

Note:This area of the DMR Loading Tool includes data used for EPA's annual review of industrial effluent discharges. EPA's Office of Water is responsible for developing programs and tools authorized under the Clean Water Act (CWA), which enables EPA and the states to protect and restore the Nation's waters. The CWA requires EPA to annually review and, if appropriate, revise its water pollution control technology-based regulations, called "effluent limitations guidelines" or "effluent guidelines," that limit the discharge of pollutants to waters of the U.S. from industrial facilities. As part of the EPA's annual reviews, EPA estimates the load of pollutants discharged using a combination of discharge monitoring report (DMR) data, from ICIS-NPDES, and Toxics Release Inventory (TRI) data. EPA also assigns a relative toxic weight to the estimated loads to rank industrial categories by toxic weighted pound equivalents (TWPE). For more background on EPA's effluent guidelines program see EPA's Effluent Guidelines website.

EPA reviews the DMR and TRI data used to calculate effluent loads and TWPE for accuracy prior to further investigating industrial categories for possible effluent guideline revisions. For identified outlier data, EPA contacts states and facilities to confirm and update (if appropriate) data values and units. For more information on the types of errors identified, see EPA's Technical Support Document for the 2010 Effluent Guidelines Program (PDF) (255 pp, 3.4MB). Because of this review, and EPA's methodology for interpreting data and calculating loads (explained in EPA's Technical Support Document for the Annual Review of Existing Effluent Guidelines and Identification of Potential New Point Source Categories), the calculated loads and category rankings may differ using DMR and TRI data that has not been updated. Data that have been updated by EPA's annual reviews are flagged by green flags designating that a change has been made to a concentration, quantity, or flow value. View a listing of the changes for the most recent annual review (PDF) (1 pg, 7K).

Point Source Category Information - Steam electric power generating (DMR)

EPA 304M Annual Review flag — Indicates load was altered by EPA’s 304M Annual Review. You can hover over the green flag to see the original load from the DMR data.

Top Pollutants - Toxic-Weighted Pounds (TWPE) (2011)
Pollutant Name Total DMR TWPE (lb-eq/yr) % of Category TWPE Cumulative % of
Category TWPE
Cadmium, total recoverable 3,244,603  Original DMR load is 3,244,594 31.1 31.1
Copper, total recoverable 2,298,300  Original DMR load is 2,298,300 22.04 53.1
Zinc, total recoverable 2,021,469  Original DMR load is 2,021,468 19.3 72.5
Arsenic, total recoverable 842,673  Original DMR load is 842,670 8.083 80.6
Lead, total recoverable 549,908  Original DMR load is 549,907 5.27 85.9
Selenium, total recoverable 289,988  Original DMR load is 289,987 2.78 88.7
Nickel, total recoverable 196,813  Original DMR load is 196,813 1.88 90.5
Aluminum, total recoverable 116,944 1.12 91.7
Chlorine, total residual 106,645  Original DMR load is 106,795 1.023 92.7
Chromium, hexavalent tot recoverable 98,653 0.94 93.6

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Top Receiving Watersheds (2011)
HUC-12 Code HUC Name Total DMR TWPE (lb-eq/yr)
180701060702 Alamitos Bay 9,259,071
050200030309 West Run-Monongahela River 162,771
051402011006 Red Bush-Little Pigeon Creek 150,078
050100090304 Chartiers Run-Allegheny River 39,745
041401010603 Mill Creek-Frontal Lake Ontario 34,118
040400020101 Wind Point-Frontal Lake Michigan 24,216
180701040500 Manhattan Beach-Frontal Santa Monica Bay 22,877
060400050402 Tennessee River-Indian Creek 20,568
051401010302 Crooked Creek-Ohio River 20,436
020402031008 City of Philadelphia-Schuylkill River 18,524

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Top Facility Discharges in Toxic-Weighted Pounds (TWPE) (2011)
NPDES ID Facility Name City, State SIC Code HUC-12 Code Top Pollutant Top Pollutant TWPE (lb-eq/yr)
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Cadmium 3,220,760
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Copper 2,250,198
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Zinc 2,016,626
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Arsenic 781,488
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Lead 547,596
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Nickel 195,722
WV0004731 FORT MARTIN POWER STATION MAIDSVILLE, WV 4911 050200030309 Selenium 150,098
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Selenium 102,354
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Chromium, Hexavalent 98,653
IN0002259 SIGECO F B CULLEY GENERATING STATION NEWBURGH, IN 4911 051402011006 Aluminum 77,272

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