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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 information on the methodology and types of changes identified, see EPA's most recent odd-numbered year Annual Effluent Guidelines Review Report (PDF) (169 pp, 2MB) on the Effluent Guidelines Plan webpage. Because of this review and EPA's methodology for interpreting data and calculating loads, the calculated loads and category rankings may differ from original calculations using DMR and TRI data that have not been updated. Data that have been updated by EPA's annual reviews are indicated by green flags designating that a change has been made to a concentration, quantity, or flow value. A listing of the DMR and TRI data changes from the most recent annual review is available in the Annual Effluent Guidelines Review Report Appendices (PDF) (241 pp, 3.3MB).

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 3,269,905 23.7 23.7
Copper 2,561,065  Original DMR load is 2,561,050 18.6 42.3
Arsenic 2,556,864  Original DMR load is 2,556,795 18.5 60.9
Zinc 2,046,896  Original DMR load is 2,046,890 14.8 75.8
Selenium 977,408  Original DMR load is 977,391 7.102 82.9
Lead 586,878  Original DMR load is 586,867 4.26 87.1
Chloride 580,755 4.22 91.4
Aluminum 228,956 1.66 93.08
Nickel 222,388  Original DMR load is 222,383 1.61 94.6
Total Residual Chlorine 190,343 1.38 96.08

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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
031002060302 Delaney Creek-Archie Creek Frontal 580,031
110702040101 Wolf Creek 275,972
050200030309 West Run-Monongahela River 162,771
180701060606 Coyote Creek-San Gabriel River 144,028
051402011203 Cowhide Slough-Ohio River 113,838
050302020805 Broad Run-Ohio River 95,975
051201111601 Turtle Creek Lake-Turtle Creek 77,717
180701040500 Manhattan Beach-Frontal Santa Monica Bay 49,847
050100090304 Chartiers Run-Allegheny River 33,156

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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
FL0000809 TAMPA ELECTRIC COMPANY-H.L. CULBREATH BAYSIDE POWER STATION TAMPA, FL 4911 031002060302 Chloride 576,495
CA0001139 AES ALAMITOS POWER PLANT LONG BEACH, CA 4911 180701060702 Lead 547,596
CA0108073 SAN ONOFRE NUCLEAR GENERATING STATION UNIT 2 SAN CLEMENTE, CA 4911 180703010403 Arsenic 525,118
CA0108181 SAN ONOFRE NUCLEAR GENERATING STATION UNIT 3 SAN CLEMENTE, CA 4911 180703010403 Arsenic 481,560
CA0108073 SAN ONOFRE NUCLEAR GENERATING STATION UNIT 2 SAN CLEMENTE, CA 4911 180703010403 Selenium 348,687
CA0108181 SAN ONOFRE NUCLEAR GENERATING STATION UNIT 3 SAN CLEMENTE, CA 4911 180703010403 Selenium 288,041

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