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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 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
Magnesium, dissolved (as Mg) 57,380 29.5 29.5
Aluminum, total (as Al) 31,241 16.09 45.6
Bromine, reported as the element 18,824 9.69 55.3
Chloride (as Cl) 17,933 9.23 64.5
Chlorine, total residual 17,645 9.0902 73.6
Aluminum, total recoverable 17,062 8.78 82.4
Potassium, total (as K) 13,055 6.72 89.1
Fluoride, total (as F) 3,741 1.92 91.1
Iron, dissolved (as Fe) 3,047 1.56 92.6
Manganese, total (as Mn) 2,534 1.305 93.9

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Top Receiving Watersheds (2011)
HUC-12 Code HUC Name Total DMR TWPE (lb-eq/yr)
210100050501 Laguna San Jose, Laguna Torrecilla, Laguna de Pinones D Watersheds 21.7
020700081005 Nichols Run-Potomac River 0.00019

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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)
FL0035378 CHARLOTTE HARBOR WATER ASSOCIATION INC PUNTA GORDA, FL 4941 031001011106 Magnesium 57,380
MD0051586 POTOMAC WATER FILTRATION PLANT POTOMAC, MD 4941 020700081002 Aluminum 25,668
MAG640059 BEVERLY - SALEM WATER FILTRATION PLANT BEVERLY, MA 4941 010900010205 Aluminum 15,474
FL0035378 CHARLOTTE HARBOR WATER ASSOCIATION INC PUNTA GORDA, FL 4941 031001011106 Chloride 15,178
FL0035378 CHARLOTTE HARBOR WATER ASSOCIATION INC PUNTA GORDA, FL 4941 031001011106 Potassium 13,055
NY0268224 SHAFT 17-DELAWARE AQUEDUCT NORTH CASTLE, NY 4941 020301020101 Total Residual Chlorine 6,646
NE0111368 NEBRASKA CITY POTABLE WATER NEBRASKA CITY, NE 4941 102400010307 Iron 3,045
MAG640034 NORTHAMPTON W T P HAYDENVILLE, MA 4941 010802010606 Total Residual Chlorine 2,540
FL0035378 CHARLOTTE HARBOR WATER ASSOCIATION INC PUNTA GORDA, FL 4941 031001011106 Nitrogen, nitrate dissolved 2,392

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