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 - Independent and Stand Alone Labs (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 95.3 45.1 45.1
Copper, total recoverable 45.6 21.6 66.7
Cadmium, total recoverable 22.7 10.7 77.4
Mercury, total (as Hg) 13.5 6.39 83.8
Polychlorinated biphenyls (PCBs) 9.68 4.58 88.4
Copper, total (as Cu) 9.61 4.55 93.02
Lead, total recoverable 4.93 2.33 95.3
Chloride (as Cl) 3.94 1.86 97.2
Iron, total (as Fe) 2.39 1.13 98.3
Zinc, total (as Zn) 1.097 0.51 98.8

Download All Data

Top Receiving Watersheds (2011)
HUC-12 Code HUC Name Total DMR TWPE (lb-eq/yr)
010600031003 Taylor River-Hampton River 22.8
060102070303 Poplar Creek Lower 19.1
020302020501 Upper Peconic River 3.98

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)
CT0090182 NATIONAL MARINE FISHERIES MILFORD, CT 8731 020302030000 Total Residual Chlorine 47.06
NJ0140155 ALCATEL-LUCENT. MURRAY HILL, NJ 8731 020301050504 Copper 45.03
OK0043931 US FAA MIKE MONRONEY AERONAUTICAL CENTER OKLAHOMA CITY, OK 8731 110902020302 Total Residual Chlorine 43.1
NH0022055 ENVIROSYSTEMS HAMPTON, NH 8734 010600031003 Cadmium 22.7
TN0002941 US DOE OAK RIDGE NATIONAL LAB OAK RIDGE, TN 8731 060102070303 Mercury 13.4
TN0002941 US DOE OAK RIDGE NATIONAL LAB OAK RIDGE, TN 8731 060102070303 Polychlorinated biphenyls 5.73
NY0003972 CORNING INC PAINTED POST, NY 8731 020501040910 Total Residual Chlorine 5.16
NJ0140155 ALCATEL-LUCENT. MURRAY HILL, NJ 8731 020301050504 Lead 4.62
NY0005835 U.S. DOE BROOKHAVEN NATL. LAB. - BROOKHAVEN SCIENCE ASSOCIATES UPTON, NY 8731 020302020501 Polychlorinated biphenyls 3.95

Download All Data

Top of Page

About the Data Glossary Error Correction Contact Us

Jump to main content.