EmissionsLookup
Non-Compliance TRI Reporter Clean Air Act Clean Water Act RCRA

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

#56 of 920 TRI reporters in PA
#1,210 of 16,877 TRI reporters in Manufacturing

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.

0
Air (CAA)
Qtrs Non-Compliant
10
Water (CWA)
Qtrs Non-Compliant
0
Hazardous Waste (RCRA)
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.

Emissions Trend (2015–2024) -1% overall
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.

Judicial
· Case 03-1978-0011
Judicial
· Case 03-1978-0047
Judicial
· Case 03-1978-0053
Judicial
· Case 03-1979-0004
$0
State Administrative Order of Consent
Clean Water Act · Case PA-0004073_11202025 · Nov 20, 2025
$135,000
Administrative - Formal
Clean Air Act · Case 3603886880 · Jan 29, 2024
$0
State CWA Non Penalty AO
Clean Water Act · Case PA-0004073_10182023 · Oct 18, 2023
Administrative - Formal
Clean Air Act · Case 3602222513 · Jun 23, 2020
$2,500
Administrative - Formal
Clean Air Act · Case 3601935280 · Jul 22, 2019
$3,600
State CWA Penalty AO
Clean Water Act · Case PA-0004073_06222015 · Jun 22, 2015
$3,625
State CWA Penalty AO
Clean Water Act · Case PA-0004073_01082008 · Jan 8, 2008
$39,841
Administrative - Formal
· Case 03-1995-0285 · Nov 12, 1996
$32,000
CWA 309G2B AO For Class II Penalties
Clean Water Act · Case 03-1995-N012 · Nov 12, 1996
WRITTEN INFORMAL
RCRA (Hazardous Waste) · Case RCRA-PAD004379061-009 · Mar 18, 1991
WRITTEN INFORMAL
RCRA (Hazardous Waste) · Case RCRA-PAD004379061-004 · Jan 30, 1990
WRITTEN INFORMAL
RCRA (Hazardous Waste) · Case RCRA-PAD004379061-005 · Jun 28, 1989
FINAL 3008(A) COMPLIANCE ORDER
RCRA (Hazardous Waste) · Case RCRA-PAD004379061-001 · May 4, 1987
$500
FINAL 3008(A) COMPLIANCE ORDER
RCRA (Hazardous Waste) · Case RCRA-PAD004379061-003 · Mar 26, 1987
$1,500
WRITTEN INFORMAL
RCRA (Hazardous Waste) · Case RCRA-PAD004379061-002 · May 15, 1986
Judicial
· Case 03-1984-0024 · Jun 28, 1985
$16,667

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