USS MON VALLEY WORKS - IRVIN PLANT
Quick Summary
- •Released 86,897 lbs of toxic chemicals to the environment in the most recent TRI reporting year.
- •Currently out of compliance in at least one environmental program (CAA, CWA, or RCRA).
- •Assessed $135,000 in total penalties since records began.
- •Reports releases of chemicals classified as known or probable carcinogens.
- Address
-
CAMP HOLLOW RD
WEST MIFFLIN, PA 15122
View on map ↗ - County
- ALLEGHENY County
- Industry
- Manufacturing
- NAICS (North American Industry Classification)
- 331110
- Inspections
- 12 · last Nov 21, 2025
- Total Penalties
- $135,000 · last Nov 20, 2025
- Registry ID
- 110008470724
How This Compares
Ranked by most recent year's total TRI releases.
Compliance Status (Last 12 Quarters)
Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.
Qtrs Non-Compliant
Qtrs Non-Compliant
Qtrs Non-Compliant
TRI Toxic Chemical Releases
Annual pounds of each toxic chemical released to air, water, and land, as reported to the EPA Toxic Release Inventory. Carcinogen (♦) and PFAS designations are per EPA and IARC classifications.
| Year | Total Releases (lbs) | vs Prior Year |
|---|---|---|
| 2015 | 76,106 | — |
| 2016 | 40,232 | -47% |
| 2017 | 86,897 | +116% |
| 2018 | 128,647 | +48% |
| 2019 | 879 | -99% |
| 2020 | 39,212 | +4358% |
| 2021 | 107,043 | +173% |
| 2022 | 91,849 | -14% |
| 2023 | 68,060 | -26% |
| 2024 | 75,352 | +11% |
2024
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 47,060 | 47,060 | — | — | — | |
| Ethylene | 26,570 | 26,570 | — | — | — | |
| Zinc compounds | 799 | 35 | 764 | — | 49,596 | |
| Lead compounds | 317 | 1 | 316 | — | 380 | |
| Nickel compounds | 213 | 7 | 206 | — | 3,840 | ♦ Carcinogen |
| Benzene | 199 | 199 | — | — | 5 | ♦ Carcinogen |
| Manganese compounds | 194 | — | 194 | — | 21,101 |
2023
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 44,013 | 44,013 | — | — | — | |
| Ethylene | 22,716 | 22,716 | — | — | — | |
| Zinc compounds | 407 | 45 | 362 | — | 52,099 | |
| Lead compounds | 286 | 1 | 286 | — | 430 | |
| Nickel compounds | 225 | 6 | 219 | — | 4,528 | ♦ Carcinogen |
| Manganese compounds | 221 | 1 | 220 | — | 25,508 | |
| Benzene | 192 | 192 | — | — | 2 | ♦ Carcinogen |
2022
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 47,253 | 47,253 | — | — | — | |
| Ethylene | 43,148 | 43,148 | — | — | — | |
| Zinc compounds | 475 | 32 | 443 | — | 47,520 | |
| Lead compounds | 296 | 1 | 295 | — | 607 | |
| Nickel compounds | 239 | 4 | 235 | — | 4,054 | ♦ Carcinogen |
| Manganese compounds | 232 | — | 232 | — | 22,777 | |
| Benzene | 206 | 206 | — | — | 1 | ♦ Carcinogen |
2021
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 55,500 | 55,500 | — | — | — | |
| Ethylene | 50,164 | 50,164 | — | — | — | |
| Zinc compounds | 454 | 37 | 417 | — | 59,399 | |
| Lead compounds | 286 | 1 | 286 | — | 482 | |
| Benzene | 243 | 243 | — | — | — | ♦ Carcinogen |
| Nickel compounds | 202 | 3 | 199 | — | 5,075 | ♦ Carcinogen |
| Manganese compounds | 194 | — | 194 | — | 28,716 |
2020
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 34,052 | 34,052 | — | — | — | |
| Ethylene | 4,060 | 4,060 | — | — | — | |
| Zinc compounds | 453 | 65 | 388 | — | 59,716 | |
| Lead compounds | 204 | 1 | 202 | — | 1,072 | |
| Nickel compounds | 154 | 5 | 149 | — | 12,081 | ♦ Carcinogen |
| Benzene | 147 | 147 | — | — | — | ♦ Carcinogen |
| Manganese compounds | 142 | 1 | 141 | — | 31,507 |
2019
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Zinc compounds | 564 | 51 | 513 | — | 60,703 | |
| Lead compounds | 190 | 1 | 190 | — | 1,148 | |
| Manganese compounds | 125 | 1 | 124 | — | 31,911 |
2018
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Ethylene | 72,219 | 72,219 | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 55,066 | 55,066 | — | — | — | |
| Zinc compounds | 606 | 49 | 557 | — | 60,594 | |
| Benzene | 244 | 244 | — | — | — | ♦ Carcinogen |
| Lead compounds | 219 | 1 | 218 | — | 1,178 | |
| Nickel compounds | 157 | 4 | 153 | — | 15,787 | ♦ Carcinogen |
| Manganese compounds | 136 | 1 | 135 | — | 37,101 |
2017
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Sodium nitrite | — | — | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 48,009 | 48,009 | — | — | — | |
| Ethylene | 38,000 | 38,000 | — | — | — | |
| Zinc compounds | 399 | 39 | 360 | — | 69,739 | |
| Lead compounds | 215 | 1 | 214 | — | 1,455 | |
| Nickel | 143 | 3 | 140 | — | 14,778 | ♦ Carcinogen |
| Manganese compounds | 131 | 1 | 130 | — | 44,034 |
2016
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 35,012 | 35,012 | — | — | — | |
| Ethylene | 4,300 | 4,300 | — | — | — | |
| Zinc compounds | 386 | 76 | 310 | — | 62,119 | |
| Lead compounds | 258 | 2 | 256 | — | 1,420 | |
| Nickel | 145 | 5 | 140 | — | 17,168 | ♦ Carcinogen |
| Manganese compounds | 131 | 1 | 130 | — | 49,031 |
2015
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 42,012 | 42,012 | — | — | — | |
| Ethylene | 33,000 | 33,000 | — | — | — | |
| Zinc compounds | 494 | 34 | 460 | — | 54,012 | |
| Lead compounds | 308 | 1 | 307 | — | 1,174 | |
| Nickel | 152 | 2 | 150 | — | 10,935 | ♦ Carcinogen |
| Manganese compounds | 140 | — | 140 | — | 36,817 |
Waste Management & Recycling
How this facility manages toxic chemicals beyond direct releases — through recycling, energy recovery, and on-site or off-site treatment. Data from the most recent TRI reporting year. Quantities in pounds.
| Chemical | Released | Recycled | Energy Recovery | Treated |
|---|---|---|---|---|
| Sodium nitrite | — | — | — | 11,386 |
| Zinc compounds | — | 48,533 | — | — |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | — | — | — | 351,122 |
| Lead compounds | — | 373 | — | — |
| Benzene | — | — | — | 1,967 |
| Nickel compounds | — | 3,534 | — | — |
| Manganese compounds | — | 18,711 | — | — |
| Ethylene | — | — | — | 2,411,971 |
Off-Site Transfer Destinations
Facilities to which toxic chemicals were transferred for disposal, recycling, energy recovery, or treatment during the most recent TRI reporting year. Quantities in pounds.
| Destination | Chemical | Disposal | Recycling | Energy Rec. | Treatment |
|---|---|---|---|---|---|
|
ARCWOOD ENVIRONMENTAL, LLC
INDIANAPOLIS, IN
|
Benzene | — | — | — | — |
|
ARCWOOD ENVIRONMENTAL - EAST LIVERPOOL, INC.
EAST LIVERPOOL, OH
|
Benzene | — | — | — | 5 |
|
NORTHWEST SANITARY LANDFILL
WEST SUNBURY, PA
|
Zinc compounds | — | — | — | — |
|
ARCWOOD ENVIRONMENTAL - EAST LIVERPOOL, INC.
EAST LIVERPOOL, OH
|
Zinc compounds | 9 | — | — | — |
|
ARCWOOD ENVIRONMENTAL, LLC
INDIANAPOLIS, IN
|
Zinc compounds | 1 | — | — | — |
|
MAGNUS PRODUCTS
BRADDOCK, PA
|
Zinc compounds | — | 1,490 | — | — |
|
METALWORKING LUBRICANTS CO C/O U.S. STEEL IRVIN PLANT
DRAVOSBURG, PA
|
Zinc compounds | — | — | — | — |
|
US ZINC CORP - CLARKSVILLE
CLARKSVILLE, TN
|
Zinc compounds | — | 47,043 | — | — |
|
USA SOUTH HILLS LANDFILL, INC.
LIBRARY, PA
|
Zinc compounds | 1,053 | — | — | — |
|
ARCWOOD ENVIRONMENTAL, LLC
INDIANAPOLIS, IN
|
Lead compounds | — | — | — | — |
|
USA SOUTH HILLS LANDFILL, INC.
LIBRARY, PA
|
Lead compounds | 2 | — | — | — |
|
MAGNUS PRODUCTS
BRADDOCK, PA
|
Lead compounds | — | 347 | — | — |
|
METALWORKING LUBRICANTS CO C/O U.S. STEEL IRVIN PLANT
DRAVOSBURG, PA
|
Lead compounds | — | — | — | — |
|
ARCWOOD ENVIRONMENTAL - EAST LIVERPOOL, INC.
EAST LIVERPOOL, OH
|
Lead compounds | 5 | — | — | — |
|
US ZINC CORP - CLARKSVILLE
CLARKSVILLE, TN
|
Lead compounds | — | 24 | — | — |
|
REMURIATE DELTA LLC
DELTA, OH
|
Lead compounds | — | 3 | — | — |
|
MAGNUS PRODUCTS
BRADDOCK, PA
|
Manganese compounds | — | 18,711 | — | — |
|
USA SOUTH HILLS LANDFILL, INC.
LIBRARY, PA
|
Manganese compounds | 2,390 | — | — | — |
|
CARBON LIMESTONE LANDFILL BFI OF OHIO INC
LOWELLVILLE, OH
|
Nickel compounds | — | — | — | — |
|
ARCWOOD ENVIRONMENTAL - EAST LIVERPOOL, INC.
EAST LIVERPOOL, OH
|
Nickel compounds | — | — | — | — |
|
USA SOUTH HILLS LANDFILL, INC.
LIBRARY, PA
|
Nickel compounds | 306 | — | — | — |
|
ARCWOOD ENVIRONMENTAL, LLC
INDIANAPOLIS, IN
|
Nickel compounds | — | — | — | — |
|
MAGNUS PRODUCTS
BRADDOCK, PA
|
Nickel compounds | — | 3,534 | — | — |
|
METALWORKING LUBRICANTS CO C/O U.S. STEEL IRVIN PLANT
DRAVOSBURG, PA
|
Nickel compounds | — | — | — | — |
Compliance Violations
Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.
| Program | Type | Violation Date | Return to Compliance | Status |
|---|---|---|---|---|
| cwa | Permit Violations - Discharge Without a Valid Permit | Nov 21, 2025 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | May 14, 2025 | May 14, 2025 | Resolved |
| cwa | Effluent Violations - Numeric effluent violation | May 14, 2025 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Apr 29, 2025 | Apr 29, 2025 | Resolved |
| cwa | Management Practice Violations - Best Management Practice Deficiencies | Oct 15, 2024 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Oct 15, 2024 | Oct 15, 2024 | Resolved |
| cwa | Permit Violations - Violation Specified in Comment | Oct 15, 2024 | — | Open |
| cwa | Reporting Violations - Failure to Notify | Oct 10, 2024 | — | Open |
| cwa | Management Practice Violations - Best Management Practice Deficiencies | Oct 10, 2024 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Oct 10, 2024 | Oct 10, 2024 | Resolved |
| cwa | Permit Violations - Violation Specified in Comment | Oct 10, 2024 | — | Open |
| cwa | Effluent Violations - Numeric effluent violation | Feb 20, 2024 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Dec 15, 2023 | Sep 6, 2024 | Resolved |
| cwa | Permit Violations - Violation Specified in Comment | Dec 15, 2023 | — | Open |
| cwa | Management Practice Violations - Best Management Practice Deficiencies | Dec 15, 2023 | — | Open |
| cwa | Failure to comply with a requirement regarding Pollution Prevention / Good Housekeeping | Oct 18, 2023 | — | Open |
| cwa | Permit Violations - Violation Specified in Comment | Oct 18, 2023 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Oct 18, 2023 | Jan 11, 2024 | Resolved |
| cwa | Failure to comply with a requirement regarding Pollution Prevention / Good Housekeeping | Oct 16, 2023 | — | Open |
| cwa | Permit Violations - Violation Specified in Comment | Oct 16, 2023 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Oct 16, 2023 | Jan 11, 2024 | Resolved |
| cwa | Permit Violations - Violation Specified in Comment | Aug 12, 2023 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Aug 12, 2023 | Jan 11, 2024 | Resolved |
| cwa | Failure to comply with a requirement regarding Pollution Prevention / Good Housekeeping | Aug 12, 2023 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | May 10, 2023 | Jan 5, 2024 | Resolved |
| cwa | Permit Violations - Violation Specified in Comment | May 10, 2023 | — | Open |
| cwa | Failure to comply with a requirement regarding Pollution Prevention / Good Housekeeping | May 10, 2023 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | Aug 15, 2022 | Sep 12, 2023 | Resolved |
| cwa | Reporting Violations - Failure to Notify | Aug 15, 2022 | — | Open |
| cwa | Permit Violations - Violation Specified in Comment | Aug 15, 2022 | — | Open |
| cwa | Effluent Violations - Numeric effluent violation | Jul 13, 2021 | — | Open |
| caa | HPV | Feb 4, 2020 | Jun 30, 2020 | Resolved |
| cwa | Management Practice Violations - Improper Operation and Maintenance | Aug 9, 2019 | — | Open |
| cwa | Reporting Violations - Failure to Notify | Aug 9, 2019 | — | Open |
| cwa | Monitoring Violations - Improper Analysis or Lab Error | Aug 9, 2019 | — | Open |
| caa | FRV | Jul 22, 2019 | — | Open |
| caa | FRV | Mar 4, 2019 | — | Open |
| caa | FRV | Feb 28, 2019 | — | Open |
| cwa | Reporting Violations - Failure to Submit DMRs | Nov 26, 2018 | — | Open |
| cwa | Management Practice Violations - Improper Operation and Maintenance | Nov 26, 2018 | — | Open |
| cwa | Effluent Violations - Numeric effluent violation | Nov 26, 2018 | — | Open |
| cwa | Reporting Violations - Failure to Notify | Nov 26, 2018 | — | Open |
| rcra | Standards Applicable to Generators of HW: General | Aug 24, 2004 | Sep 2, 2004 | Resolved |
| rcra | Standards Applicable to Recordkeeping and Reporting Applicable to Small and Large Quantity Generators | Dec 8, 1994 | May 19, 1995 | Resolved |
| rcra | Standards Applicable to Generators of HW: General | Dec 8, 1994 | May 19, 1995 | Resolved |
| rcra | Standards Applicable to Generators of HW: Manifest Requirements Applicable to Small and Large Quantity Generators | Dec 8, 1994 | May 9, 1995 | Resolved |
| rcra | Standards Applicable to Generators of HW: Manifest Requirements Applicable to Small and Large Quantity Generators | Feb 26, 1991 | Dec 8, 1994 | Resolved |
| rcra | Standards Applicable to Generators of HW: General | Feb 26, 1991 | Dec 8, 1994 | Resolved |
| rcra | Standards Applicable to Generators of HW: General | Jan 18, 1990 | Feb 28, 1990 | Resolved |
| rcra | Standards Applicable to Generators of HW: Manifest Requirements Applicable to Small and Large Quantity Generators | Jun 1, 1989 | Jul 20, 1990 | Resolved |
Discharge Limit Exceedances
Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.
| Pollutant | Violation | Reported | Limit | Exceedance | Period | Status |
|---|---|---|---|---|---|---|
| Coliform, fecal general | DMR, Limited - Numeric Violation | 1,050.00 MPN/100mL | 1,000.00 | +5% | Sep 2025 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 120.00 mg/L | 60.00 | +100% | Jul 2024 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 8.70 mg/L | 7.00 | +24% | Jul 2024 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 64.00 mg/L | 30.00 | +113% | Jun 2024 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 240.00 mg/L | 60.00 | +300% | Jun 2024 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 62.00 mg/L | 48.00 | +29% | Nov 2023 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 63.00 mg/L | 60.00 | +5% | Jul 2021 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 89.00 mg/L | 48.00 | +85% | Jan 2021 | Open |
| Oil & Grease | DMR, Limited - Numeric Violation | 19.80 mg/L | 15.00 | +32% | Jan 2021 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 49.00 mg/L | 48.00 | +2% | Jan 2020 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 8.90 mg/L | 7.00 | +27% | Dec 2019 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 3.70 mg/L | 3.50 | +6% | Nov 2018 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 8.90 mg/L | 7.00 | +27% | Nov 2018 | Open |
| Oil & Grease | DMR, Limited - Numeric Violation | 36.60 mg/L | 30.00 | +22% | May 2018 | Open |
| Oil & Grease | DMR, Limited - Numeric Violation | 29.20 mg/L | 15.00 | +95% | Mar 2018 | Resolved |
| Solids, total suspended | DMR, Limited - Numeric Violation | 70.40 mg/L | 48.00 | +47% | Mar 2018 | Open |
| Oil & Grease | DMR, Limited - Numeric Violation | 35.50 mg/L | 15.00 | +137% | Feb 2018 | Resolved |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 3.91 mg/L | 3.50 | +12% | Jan 2018 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 27.40 mg/L | 7.00 | +291% | Jan 2018 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 45.10 mg/L | 7.00 | +544% | Nov 2016 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 4.91 mg/L | 3.50 | +40% | Nov 2016 | Open |
| Oil & Grease | DMR, Limited - Numeric Violation | 58.90 mg/L | 30.00 | +96% | Feb 2016 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 3.82 mg/L | 3.50 | +9% | Jan 2016 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 27.80 mg/L | 7.00 | +297% | Apr 2015 | Open |
| Iron, total [as Fe] | DMR, Limited - Numeric Violation | 10.80 mg/L | 7.00 | +54% | Mar 2015 | Open |
Enforcement Actions
Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.