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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 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 p, 7K).

Point Source Category Information - Oil & Gas Extraction (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
Mercury (Hg), in barite, dry weight 73,768 69.5 69.5
Cadmium (Cd), in barite, dry weight 24,196 22.8 92.3
Chloride (as Cl) 2,195 2.069 94.4
Sulfide, total (as S) 2,116 1.99 96.4
Fluoride, total (as F) 829 0.78 97.1
Manganese, total recoverable 752 0.708 97.8
Silver total recoverable 443 0.41 98.3
Barium, total (as Ba) 420 0.39 98.7
Selenium, total recoverable 244 0.23 98.9
Lead, total recoverable 231 0.21 99.1

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Top Receiving Watersheds (2011)
HUC-12 Code HUC Name Total DMR TWPE (lb-eq/yr)
041000070306 Lima Reservoir-Ottawa River 1,839
080402020502 City of El Dorado-Bayou de Loutre 514
080402010405 Holmes Creek 52.9
051402010703 South Yellow Creek Fork-Ohio River 6.66
110702080203 McKisic Creek-Little Sugar Creek 4.31

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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)
GMG290067 W & T OFFSHORE INC HOUSTON, GM 1311 210200010101 Mercury 33,507
GMG290056 NEXEN PETROLEUM U.S.A., INC. LAFAYETTE, GM 1311 Mercury 28,776
GMG290157 ATP OIL & GAS CORPORATION HOUSTON, GM 1311 210200010101 Mercury 11,485
GMG290067 W & T OFFSHORE INC HOUSTON, GM 1311 210200010101 Cadmium 11,174
GMG290056 NEXEN PETROLEUM U.S.A., INC. LAFAYETTE, GM 1311 Cadmium 9,238
GMG290184 BHP BILLITON PETROLEUM HOUSTON, GM 1311 210200010101 Cadmium 2,812
OH0002623 LIMA REFINING CO LIMA, OH 1389 041000070306 Sulfide 1,681
PA0101508 PA BRINE TRMT FAC FRANKLIN, PA 1389 Chloride 1,094
GMG290157 ATP OIL & GAS CORPORATION HOUSTON, GM 1311 210200010101 Cadmium 971
NY0004278 INERGY MIDSTREAM LLC. SAVONA, NY 4925 020501050207 Chloride 812

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