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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 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.

Top Industrial Dischargers of Toxic Pollutants

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

2017 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   Drinking water treatment 36,488,746  Original DMR load is 36,488,650 0 36,488,746 79.1
2 423 Steam electric power generating 3,434,812  Original DMR load is 3,434,810 0 3,434,812 86.6
3 420 Iron and steel manufacturing 2,536,115 0 2,536,115 92.1
4 418 Fertilizer manufacturing 418,959 0 418,959 93.02
5 430 Pulp, paper and paperboard 311,479 0 311,479 93.7
6 414 Organic chemicals, plastics and synthetic fibers 291,904 0 291,904 94.3
7   Superfund sites 263,809 0 263,809 94.9
8   Miscellaneous foods and beverages 254,108 0 254,108 95.4
9 435 Oil and gas extraction 223,679 0 223,679 95.9
10 407 Canned and preserved fruits and vegetables processing 216,401 0 216,401 96.4
11 414.1 CCH 214,738 0 214,738 96.8
12 419 Petroleum refining 187,211  Original DMR load is 187,211 0 187,211 97.2
13 440 Ore mining and dressing 184,225  Original DMR load is 184,257 0 184,225 97.6
14 434 Coal mining 175,300  Original DMR load is 175,286 0 175,300 98.06
15 415 Inorganic chemicals manufacturing 151,656 0 151,656 98.3
16 421 Nonferrous metals manufacturing 134,455 0 134,455 98.6
17   Unassigned waste facility 99,049 0 99,049 98.9
18 436 Mineral mining and processing 90,896 0 90,896 99.09
19 410 Textile mills 60,528 0 60,528 99.2
20 433 Metal finishing 55,318  Original DMR load is 55,221 0 55,318 99.3
21 442 Transportation equipment cleaning 55,133 0 55,133 99.4
22 432 Meat and poultry products 53,959 0 53,959 99.5
23 451 Concentrated aquatic animal production 46,571  Original DMR load is 46,571 0 46,571 99.6
24 460 Hospital 19,883 0 19,883 99.7
25 429 Timber products processing 18,066 0 18,066 99.7
26 414.2 Cellulose products manufacturing 15,250 0 15,250 99.8
27 445 Landfills 14,310 0 14,310 99.8
28 422 Phosphate manufacturing 9,983 0 9,983 99.8
29 446 Paint formulating 8,488 0 8,488 99.8
30 406 Grain mills 6,343 0 6,343 99.8
31 449 Airport deicing 6,275 0 6,275 99.9
32 467 Aluminum forming 5,235 0 5,235 99.9
33 409 Sugar processing 5,079  Original DMR load is 5,094 0 5,079 99.9
34 444 Waste combustors 4,882  Original DMR load is 4,882 0 4,882 99.9
35 437 Centralized waste treatment 4,569 0 4,569 99.9
36 428 Rubber manufacturing 3,500  Original DMR load is 3,503 0 3,500 99.9
37 464 Metal molding and casting (foundries) 3,250 0 3,250 99.9
38 455 Pesticide chemicals 2,570 0 2,570 99.9
39 439 Pharmaceutical manufacturing 2,323 0 2,323 99.9
40 471 Nonferrous metals forming and metal powders 2,163 0 2,163 99.9
41 457 Explosives manufacturing 2,041 0 2,041 99.9
42 463 Plastics molding and forming 1,807 0 1,807 99.9
43 424 Ferroalloy manufacturing 1,738 0 1,738 99.9
44 411 Cement manufacturing 1,461 0 1,461 99.9
45 408 Canned and preserved seafood processing 1,214 0 1,214 99.9
46 405 Dairy products processing 678 0 678 99.9
47 417 Soap and detergent manufacturing 656 0 656 99.9
48   Independent and stand alone labs 592 0 592 99.9
49 450 Construction and development 413 0 413 99.9
50 468 Copper forming 343 0 343 99.9
51 426 Glass manufacturing 294 0 294 99.9
52 461 Battery manufacturing 143 0 143 99.9
53 425 Leather tanning and finishing 90 0 90 99.9
54   Food service establishments 54 0 54 99.9
55 443 Paving and roofing materials (tars and asphalt) 46 0 46 99.9
56 469 Electrical and electronic components 42 0 42 99.9
57   Printing and publishing 26 0 26 99.9
58 438 Metal products and machinery 22  Original DMR load is 19 0 22 99.9
59 454 Gum and wood chemicals manufacturing 11 0 11 99.9
60 412 CAFO 10 0 10 99.9
61 465 Coil coating 3 0 3 99.9
62 427 Asbestos manufacturing 1 0 1 99.9
63 458 Carbon black manufacturing 0 0 0 99.9
64 447 Ink formulating 0 0 0 99.9
65   Photo processing 0 0 0 99.9
66 459 Photographic 0 0 0 100
67 413 Electroplating 0 0 0 100
68 466 Porcelain enameling 0 0 0 100
69   Industrial laundries 0 0 0 100
70   Tobacco products 0 0 0 100
TOTAL 46,092,903 0 46,092,903 100

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.

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