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 - Drinking Water Treatment (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
Chlorine, total residual 185,398  Original DMR load is 362,592 24.4 24.4
Copper, total (as Cu) 117,435 15.4 39.9
Lead, total (as Pb) 108,961 14.3 54.3
Aluminum, total (as Al) 82,964  Original DMR load is 82,962 10.9 65.2
Aluminum, acid soluble 74,420 9.81 75.09
Magnesium, dissolved (as Mg) 57,380 7.57 82.6
Zinc, total (as Zn) 33,536 4.42 87.09
Bromine, reported as the element 18,824 2.48 89.5
Chloride (as Cl) 18,178 2.39 91.9
Aluminum, total recoverable 17,244 2.27 94.2

Download All Data

Top Receiving Watersheds (2011)
HUC-12 Code HUC Name Total DMR TWPE (lb-eq/yr)
031001011106 Lower Shell Creek 111,859
060300010205 Marshall Branch-Tennessee River 71,764
020700081005 Nichols Run-Potomac River 50,318
020700081002 Watts Branch 25,668
210100050501 Laguna San Jose, Laguna Torrecilla, Laguna de Pinones D Watersheds 17,526
071401010403 Schoenberger Creek-Mississippi River 9,082
020301020101 Kensico Reservoir 6,646
010802010606 Mill River 4,696
102400010307 Walnut Creek-Missouri River 3,234
031002010102 Roberts Bay Frontal 3,158

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)
PR0022781 PRASA WTP PTA VIEJA PONCE PONCE, PR 4941 210100040307 Total Residual Chlorine 21,437  Original DMR load is 198,664
PR0022853 PRASA NAGUABO WTP NAGUABO, PR 4941 210100050203 Copper 114,460
PR0022853 PRASA NAGUABO WTP NAGUABO, PR 4941 210100050203 Lead 60,466
AL0078557 DEKALB JACKSON WTP FLAT ROCK, AL 4941 060300010205 Aluminum 59,070
FL0035378 CHARLOTTE HARBOR WATER ASSOCIATION INC PUNTA GORDA, FL 4941 031001011106 Magnesium 57,380
DC0000019 US ARMY CORPS OF ENGINEERS DALECARLIA WTP WASHINGTON, DC 4941 020700081005 Aluminum 49,962
PR0022845 PRASA WTP RIO BLANCO NAGUABO, PR 4941 210100050202 Lead 47,436
PR0024007 PRASA WTP SABANA GRANDE SABANA GRANDE, PR 4941 210100030409 Total Residual Chlorine 40,359
MD0051586 POTOMAC WATER FILTRATION PLANT POTOMAC, MD 4941 020700081002 Aluminum 25,668
PR0022853 PRASA NAGUABO WTP NAGUABO, PR 4941 210100050203 Total Residual Chlorine 19,652

Download All Data

Top of Page

About the Data Glossary Error Correction Contact Us

Jump to main content.