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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 (PDF) (169 pp, 2MB) 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 (PDF) (241 pp, 3.3MB).

Point Source Category Information - Ore mining and dressing (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
Arsenic 10,569  Original DMR load is 20,390 17.7 17.7
Fluoride 17,067 28.6 46.4
Copper 6,988  Original DMR load is 6,990 11.7 58.2
Cadmium 6,055  Original DMR load is 6,059 10.1 68.4
Molybdenum 5,698 9.58 77.9
Manganese 4,832  Original DMR load is 4,838 8.12 86.1
Lead 2,076  Original DMR load is 2,078 3.49 89.5
Selenium 1,784 3.00026 92.6
Zinc 1,301  Original DMR load is 1,303 2.18 94.7
Sulfide 991 1.66 96.4

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Top Receiving Watersheds (2011)
HUC-12 Code HUC Name Total DMR TWPE (lb-eq/yr)
110200010202 East Fork Arkansas River 28,209
040101020101 City of Silver Bay-Frontal Lake Superior 5,056
170501110105 James Creek-Middle Fork Boise River 2,302
040301100108 Warner Creek-East Branch Escanaba River 1,518
040201010107 Mineral River 1,020
101900010101 Mosquito Creek 855
101202020207 Upper Whitewood Creek 756
170602031001 Upper Napias Creek 755
040201050101 Deer Lake-Carp Creek 666
051301060310 Cumberland River-Turkey Creek 261

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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)
CO0000248 CLIMAX MINE SUMMIT COUNTY, CO 1061 110200010202 Fluoride 16,192
AK0053341 POGO MINE DELTA JUNCTION, AK 1041 190405031702 Arsenic 427  Original DMR load is 10,248
UT0000051 KENNECOTT UTAH COPPER, LLC MAGNA, UT 1021 160202040403 Arsenic 5,471
CO0000248 CLIMAX MINE SUMMIT COUNTY, CO 1061 110200010202 Molybdenum 5,210
CO0000248 CLIMAX MINE SUMMIT COUNTY, CO 1061 110200010202 Manganese 4,378
UT0000051 KENNECOTT UTAH COPPER, LLC MAGNA, UT 1021 160202040403 Cadmium 3,375
MN0055301 NORTHSHORE MINING - SILVER BAY SILVER BAY, MN 1011 040101020101 Copper 2,984
MN0055301 NORTHSHORE MINING - SILVER BAY SILVER BAY, MN 1011 040101020101 Lead 1,525

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