Jump to main content or area navigation.

Contact Us

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 - CCH (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
Hexachlorobenzene 557,870 66.6 66.6
Polychlorinated biphenyls (PCBs) 112,421 13.4 80.1
Sulfide, total (as S) 42,754 5.11 85.2
Chlorine, total residual 30,688 3.66 88.9
Mercury, total (as Hg) 21,177 2.53 91.4
Benzo(a)pyrene 12,704 1.51 92.9
Aluminum, total recoverable 11,668 1.39 94.3
Copper, total (as Cu) 9,771 1.16 95.5
Lead, total (as Pb) 7,043 0.84 96.3
Chloride (as Cl) 5,858 0.7003 97.06

Download All Data

Top Receiving Watersheds (2011)
HUC-12 Code HUC Name Total DMR TWPE (lb-eq/yr)
051402020605 Beaverdam Creek-Ohio River 246,280
060400060502 Guess Creek-Tennessee River 74,455
080802060301 Maple Fork-Bayou D'Inde 15,893
060200021406 Hiwassee River-Dry Valley 7,042
080901000101 Mississippi River-Bonnet Carre Spillway 6,689
041201040605 Niagara Falls-Niagara River 2,731
080701000105 Claiborne Island 2,704
111403060411 Tete Bayou-Frontal Caddo Lake 1,228
020402050703 Red Lion Creek-Delaware River 1,147
120402030106 Cedar Point Lateral-Cedar Bayou 998

Download All Data

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)
IN0002101 SABIC INNOVATIVE PLASTICS MT. VERNON, LLC MOUNT VERNON, IN 2821 051402020605 Hexachlorobenzene 219,215
OH0007269 DOVER CHEMICAL CORP DOVER, OH Polychlorinated biphenyls 112,421
KY0003484 WESTLAKE VINYLS INC CALVERT CITY, KY 060400060502 Hexachlorobenzene 72,972
KY0001457 RECAST ENERGY LOUISVILLE, LLC LOUISVILLE, KY 2821 051401010904 Total Residual Chlorine 23,781
TX0053813 SHINTECH INC FREEPORT, TX 120904010308 Hexachlorobenzene 16,732
IN0002101 SABIC INNOVATIVE PLASTICS MT. VERNON, LLC MOUNT VERNON, IN 2821 051402020605 Benzo[a]pyrene 11,234
LA0000761 PPG INDUSTRIES INC - LAKE CHARLES COMPLEX LAKE CHARLES, LA 2869 080802060301 Mercury 8,543

Download All Data

Top of Page

About the Data Glossary Error Correction Contact Us

Jump to main content.