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).

Top Industrial Dischargers of Toxic Pollutants

Instructions. Select a reporting year and click View Rankings to view the top industrial discharges of toxic pollutants for a specific year. Click a hyperlinked TWPE value in the result to view more DMR or TRI detail for a point source category.

2014 Point Source Category Rankings

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 or TRI data.

Rank 40 CFR Part Industrial Sector DMR TWPE (lb-eq/yr) TRI TWPE (lb-eq/yr) Total TWPE (lb-eq/yr) Cumulative %
of Total TWPE (lb-eq/yr)
1   Unassigned Waste Facility 165,375,838 0 165,375,838 91.01
2 420 Iron and steel manufacturing 7,722,249 0 7,722,249 95.2
3 423 Steam electric power generating 1,682,284  Original DMR load is 1,682,285 0 1,682,284 96.1
4 414 Organic chemicals, plastics and synthetic fibers 1,091,826 0 1,091,826 96.7
5 464 Metal molding and casting (foundries) 1,046,101  Original DMR load is 1,046,065 0 1,046,101 97.3
6 414.1 CCH 830,446 0 830,446 97.8
7   Drinking Water Treatment 744,280  Original DMR load is 744,140 0 744,280 98.2
8 429 Timber products processing 733,832 0 733,832 98.6
9 422 Phosphate manufacturing 442,400 0 442,400 98.8
10 436 Mineral Mining and Processing 431,532 0 431,532 99.1
11 419 Petroleum refining 379,566  Original DMR load is 379,587 0 379,566 99.3
12 430 Pulp, paper and paperboard 357,271 0 357,271 99.5
13 415 Inorganic chemicals manufacturing 194,270 0 194,270 99.6
14 435 Oil & Gas Extraction 146,700 0 146,700 99.7
15 421 Nonferrous metals manufacturing 144,710 0 144,710 99.7
16 418 Fertilizer manufacturing 69,828 0 69,828 99.8
17 433 Metal Finishing 57,739 0 57,739 99.8
18   Miscellaneous Foods and Beverages 43,250 0 43,250 99.8
19 440 Ore mining and dressing 37,734  Original DMR load is 37,731 0 37,734 99.9
20 434 Coal mining 31,904 0 31,904 99.9
21 410 Textile mills 19,953 0 19,953 99.9
22 449 Airport Deicing 17,905 0 17,905 99.9
23 445 Landfills 14,092 0 14,092 99.9
24 460 Hospital 10,942  Original DMR load is 10,942 0 10,942 99.9
25 439 Pharmaceutical manufacturing 9,351 0 9,351 99.9
26 463 Plastics molding and forming 9,017 0 9,017 99.9
27 437 Centralized Waste Treatment 6,917 0 6,917 99.9
28 444 Waste combustors 6,203  Original DMR load is 6,205 0 6,203 99.9
29 432 Meat and Poultry Products 6,152 0 6,152 99.9
30 454 Gum and wood chemicals manufacturing 5,651 0 5,651 99.9
31 467 Aluminum forming 4,447 0 4,447 99.9
32 409 Sugar processing 4,005 0 4,005 99.9
33 406 Grain mills 3,376 0 3,376 99.9
34 424 Ferroalloy manufacturing 2,937 0 2,937 99.9
35 428 Rubber Manufacturing 2,758  Original DMR load is 2,761 0 2,758 99.9
36 468 Copper forming 2,370 0 2,370 99.9
37 411 Cement manufacturing 2,295 0 2,295 99.9
38 457 Explosives manufacturing 2,264 0 2,264 99.9
39 455 Pesticide chemicals 2,047 0 2,047 99.9
40   Printing & Publishing 1,830 0 1,830 99.9
41 408 Canned and preserved seafood processing 1,484  Original DMR load is 1,412 0 1,484 99.9
42 451 Concentrated Aquatic Animal Production 1,140 0 1,140 99.9
43 471 Nonferrous metals forming and metal powders 1,016 0 1,016 99.9
44 405 Dairy products processing 643 0 643 99.9
45   Independent and Stand Alone Labs 518 0 518 99.9
46 438 Metal Products and Machinery 446 0 446 99.9
47 407 Canned and preserved fruits and vegetables processing 334 0 334 99.9
48 442 Transportation Equipment Cleaning 278 0 278 99.9
49 443 Paving and roofing materials (tars and asphalt) 231 0 231 99.9
50 426 Glass manufacturing 205 0 205 99.9
51 450 Construction and Development 169 0 169 99.9
52 461 Battery manufacturing 96 0 96 99.9
53 469 Electrical and electronic components 95 0 95 99.9
54 417 Soap and detergent manufacturing 56 0 56 99.9
55   Food Service Establishments 30 0 30 99.9
56 425 Leather tanning and finishing 6 0 6 99.9
57 412 CAFO 5 0 5 99.9
58 446 Paint formulating 1 0 1 99.9
59   Tobacco Products 0 0 0 99.9
60 458 Carbon black manufacturing 0 0 0 99.9
61   Photo Processing 0 0 0 99.9
62 459 Photographic 0 0 0 99.9
63 465 Coil coating 0 0 0 99.9
64 447 Ink formulating 0 0 0 100
65 466 Porcelain Enameling 0 0 0 100
66   Superfund Sites 0 0 0 100
67 413 Electroplating 0 0 0 100
68 427 Asbestos manufacturing 0 0 0 100
69   Industrial Laundries 0 0 0 100
TOTAL 181,705,020 0 181,705,020 100

Download Rankings

Note: Most industrial sectors have national technology-based wastewater regulations, which are called effluent guidelines. You can learn more about the effluent guidelines regulations controlling industrial wastewater pollution. Industrial sectors that do not currently have effluent guidelines regulations are listed without a Code of Federal Regulation (CFR) part number.

About the Data Glossary Error Correction Contact Us

Jump to main content.