Part 63 — National Emission Standards for Hazardous Air Pollutants for Source Categories
Current through Aug 22, 2025
Authority: 42 U.S.C. 7401 et seq.
Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
Sections
- § 63.1 Applicability.
- § 63.2 Definitions.
- § 63.3 Units and abbreviations.
- § 63.4 Prohibited activities and circumvention.
- § 63.5 Preconstruction review and notification requirements.
- § 63.6 Compliance with standards and maintenance requirements.
- § 63.7 Performance testing requirements.
- § 63.8 Monitoring requirements.
- § 63.9 Notification requirements.
- § 63.10 Recordkeeping and reporting requirements.
- § 63.11 Control device and work practice requirements.
- § 63.12 State authority and delegations.
- § 63.13 Addresses of State air pollution control agencies and EPA Regional Offices.
- § 63.14 Incorporations by reference.
- § 63.15 Availability of information and confidentiality.
- § 63.16 Performance Track Provisions.
- Table 1 to Subpart A of Part 63—Detection Sensitivity Levels (grams per hour)
- § 63.40 Applicability of §§ 63.40 through 63.44.
- § 63.41 Definitions.
- § 63.42 Program requirements governing construction or reconstruction of major sources.
- § 63.43 Maximum achievable control technology (MACT) determinations for constructed and reconstructed major sources.
- § 63.44 Requirements for constructed or reconstructed major sources subject to a subsequently promulgated MACT standard or MACT requirement.
- §§ 63.45-63.49 [Reserved]
- § 63.50 Applicability.
- § 63.51 Definitions.
- § 63.52 Approval process for new and existing affected sources.
- § 63.53 Application content for case-by-case MACT determinations.
- § 63.54 Preconstruction review procedures for new affected sources.
- § 63.55 Maximum achievable control technology (MACT) determinations for affected sources subject to case-by-case determination of equivalent emission limitations.
- § 63.56 Requirements for case-by-case determination of equivalent emission limitations after promulgation of subsequent MACT standard.
- Table 1 to Subpart B of Part 63—Section 112(j) Part 2 Application Due Dates
- Table 2 to Subpart B of Part 63—MON Source Categories
- § 63.60 Deletion of caprolactam from the list of hazardous air pollutants.
- § 63.61 Deletion of methyl ethyl ketone from the list of hazardous air pollutants.
- § 63.62 Redefinition of glycol ethers listed as hazardous air pollutants.
- § 63.63 Deletion of ethylene glycol monobutyl ether from the list of hazardous air pollutants.
- § 63.64 Additions of substances to the list of hazardous air pollutants.
- §§ 63.65-63.69 [Reserved]
- § 63.70 Applicability.
- § 63.71 Definitions.
- § 63.72 General provisions for compliance extensions.
- § 63.73 Source.
- § 63.74 Demonstration of early reduction.
- § 63.75 Enforceable commitments.
- § 63.76 Review of base year emissions.
- § 63.77 Application procedures.
- § 63.78 Early reduction demonstration evaluation.
- § 63.79 Approval of applications.
- § 63.80 Enforcement.
- § 63.81 Rules for special situations.
- § 63.90 Program overview.
- § 63.91 Criteria for straight delegation and criteria common to all approval options.
- § 63.92 Approval of State requirements that adjust a section 112 rule.
- § 63.93 Approval of State requirements that substitute for a section 112 rule.
- § 63.94 Approval of State permit terms and conditions that substitute for a section 112 rule.
- § 63.95 Additional approval criteria for accidental release prevention programs.
- § 63.96 Review and withdrawal of approval.
- § 63.97 Approval of a State program that substitutes for section 112 requirements.
- § 63.98 [Reserved]
- § 63.99 Delegated Federal authorities.
- § 63.100 Applicability and designation of source.
- § 63.101 Definitions.
- § 63.102 General standards.
- § 63.103 General compliance, reporting, and recordkeeping provisions.
- § 63.104 Heat exchange system requirements.
- § 63.105 Maintenance wastewater requirements.
- § 63.106 Implementation and enforcement.
- § 63.107 Identification of process vents subject to this subpart.
- § 63.108 Flare requirements.
- § 63.109 Procedures for determining whether process vents, storage vessels, equipment, wastewater, and heat exchange systems are in ethylene oxide service.
- Table 1 to Subpart F of Part 63—Synthetic Organic Chemical Manufacturing Industry Chemicals
- Table 2 to Subpart F of Part 63—Organic Hazardous Air Pollutants
- Table 3 to Subpart F of Part 63—General Provisions Applicability to Subparts F, G, and H a to Subpart F
- Table 4 to Subpart F of Part 63—Organic Hazardous Air Pollutants Subject to Cooling Tower Monitoring Requirements in § 63.104
- § 63.110 Applicability.
- § 63.111 Definitions.
- § 63.112 Emission standard.
- § 63.113 Process vent provisions—reference control technology.
- § 63.114 Process vent provisions—monitoring requirements.
- § 63.115 Process vent provisions—methods and procedures for process vent group determination.
- § 63.116 Process vent provisions—performance test methods and procedures to determine compliance.
- § 63.117 Process vent provisions—reporting and recordkeeping requirements for group and TRE determinations and performance tests.
- § 63.118 Process vent provisions—periodic reporting and recordkeeping requirements.
- § 63.119 Storage vessel provisions—reference control technology.
- § 63.120 Storage vessel provisions—procedures to determine compliance.
- § 63.121 Storage vessel provisions—alternative means of emission limitation.
- § 63.122 Storage vessel provisions—reporting.
- § 63.123 Storage vessel provisions—recordkeeping.
- § 63.124 Process vents and storage vessels that are in ethylene oxide service—procedures to determine compliance.
- § 63.125 [Reserved]
- § 63.126 Transfer operations provisions—reference control technology.
- § 63.127 Transfer operations provisions—monitoring requirements.
- § 63.128 Transfer operations provisions—test methods and procedures.
- § 63.129 Transfer operations provisions—reporting and recordkeeping for performance tests and notification of compliance status.
- § 63.130 Transfer operations provisions—periodic recordkeeping and reporting.
- § 63.131 [Reserved]
- § 63.132 Process wastewater provisions—general.
- § 63.133 Process wastewater provisions—wastewater tanks.
- § 63.134 Process wastewater provisions—surface impoundments.
- § 63.135 Process wastewater provisions—containers.
- § 63.136 Process wastewater provisions—individual drain systems.
- § 63.137 Process wastewater provisions—oil-water separators.
- § 63.138 Process wastewater provisions—performance standards for treatment processes managing Group 1 wastewater streams and/or residuals removed from Group 1 wastewater streams.
- § 63.139 Process wastewater provisions—control devices.
- § 63.140 Process wastewater provisions—delay of repair.
- §§ 63.141-63.142 [Reserved]
- § 63.143 Process wastewater provisions—inspections and monitoring of operations.
- § 63.144 Process wastewater provisions—test methods and procedures for determining applicability and Group 1/Group 2 determinations (determining which wastewater streams require control).
- § 63.145 Process wastewater provisions—test methods and procedures to determine compliance.
- § 63.146 Process wastewater provisions—reporting.
- § 63.147 Process wastewater provisions—recordkeeping.
- § 63.148 Leak inspection provisions.
- § 63.149 Control requirements for certain liquid streams in open systems within a chemical manufacturing process unit.
- § 63.150 Emissions averaging provisions.
- § 63.151 Initial notification.
- § 63.152 General reporting and continuous records.
- § 63.153 Implementation and enforcement.
- Table 1 to Subpart G of Part 63—Process Vents—Coefficients for Total Resource Effectiveness for Existing Source Nonhalogenated and Halogenated Vent Streams
- Table 1A to Subpart G of Part 63—Applicable 40 CFR Part 63 General Provisions
- Table 2 to Subpart G of Part 63—Process Vents—Coefficients for Total Resource Effectiveness for New Source Nonhalogenated and Halogenated Vent Streams
- Table 3 to Subpart G of Part 63—Process Vents—Process Vents—Monitoring, Recordkeeping, and Reporting Requirements for Control Devices and Recapture Devices
- Table 4 to Subpart G of Part 63—Process Vents—Monitoring, Recordkeeping, and Reporting Requirements for Maintaining a TRE Index Value >1.0 and. ≤4.0 [No Longer Applicable in Accordance With § 63.113(a)(4)]
- Table 5 to Subpart G of Part 63—Group 1 Storage Vessels at Existing Sources
- Table 6 to Subpart G of Part 63—Group 1 Storage Vessels at New Sources
- Table 7 to Subpart G of Part 63—Transfer Operations—Monitoring, Recordkeeping, and Reporting Requirements for Complying With 98 Weight-Percent Reduction of Total Organic Hazardous Air Pollutants Emissions or a Limit of 20 Parts per Million by Volume
- Table 8 to Subpart G of Part 63—Organic HAP's Subject to the Wastewater Provisions for Process Units at New Sources
- Table 9 to Subpart G of Part 63—Organic HAP's Subject to the Wastewater Provisions for Process Units at New and Existing Sources and Corresponding Fraction Removed (Fr) Values
- Table 10 to Subpart G of Part 63—Wastewater—Compliance Options for Wastewater Tanks
- Table 11 to Subpart G of Part 63—Wastewater—Inspection and Monitoring Requirements for Waste Management Units
- Table 12 to Subpart G of Part 63—Monitoring Requirements for Treatment Processes
- Table 13 to Subpart G of Part 63—Wastewater—Monitoring Requirements for Control Devices
- Tables 14-14b to Subpart G of Part 63 [Reserved]
- Table 15 to Subpart G of Part 63—Wastewater—Information on Table 8 and/or Table 9 Compounds To Be Submitted With Notification of Compliance Status for Process Units at New and/or Existing Sources a b
- Table 16 to Subpart G of Part 63 [Reserved]
- Table 17 to Subpart G of Part 63—Information for Treatment Processes To Be Submitted With Notification of Compliance Status a b
- Table 18 to Subpart G of Part 63—Information for Waste Management Units To Be Submitted With Notification of Compliance Status a b
- Table 19 to Subpart G of Part 63—Wastewater—Information on Residuals To Be Submitted With Notification of Compliance Status a b
- Table 20 to Subpart G of Part 63—Wastewater—Periodic Reporting Requirements for Control Devices Subject to § 63.139 Used To Comply With §§ 63.13 Through 63.139
- Table 21 to Subpart G of Part 63—Average Storage Temperature (Ts) as a Function of Tank Paint Color
- Table 22 to Subpart G of Part 63—Paint Factors for Fixed Roof Tanks
- Table 23 to Subpart G of Part 63—Average Clingage Factors (c) a
- Table 24 to Subpart G of Part 63—Typical Number of Columns as a Function of Tank Diameter for Internal Floating Roof Tanks With Column Supported Fixed Roofs a
- Table 25 to Subpart G of Part 63—Effective Column Diameter (Fc)
- Table 26 to Subpart G of Part 63—Seal Related Factors for Internal Floating Roof Vessels
- Table 27 to Subpart G of Part 63—Summary of Internal Floating Deck Fitting Loss Factors (KF) and Typical Number of Fittings (NF)
- Table 28 to Subpart G of Part 63—Deck Seam Length Factors a (SD) for Internal Floating Roof Tanks
- Table 29 to Subpart G of Part 63—Seal Related Factors for External Floating Roof Vessels
- Table 30 to Subpart G of Part 63—Roof Fitting Loss Factors, KFa, KFb, and m, a and Typical Number of Fittings, NT
- Table 31 to Subpart G of Part 63—Typical Number of Vacuum Breakers, NF6 and Roof Drains, a NF7
- Table 32 to Subpart G of Part 63—Typical Number of Roof Legs, a NF8
- Table 33 to Subpart G of Part 63—Saturation Factors
- Table 34 to Subpart G of Part 63—Fraction Measured (Fm) and Fraction Emitted (Fe) For HAP Compounds in Wastewater Streams
- Table 35 to Subpart G of Part 63—Control Requirements for Items of Equipment That Meet the Criteria of § 63.149 of Subpart G
- Table 36 to Subpart G of Part 63—Compound Lists Used for Compliance Demonstrations for Enhanced Biological Treatment Processes (See § 63.145(h))
- Table 37 to Subpart G of Part 63—Default Biorates for List 1 Compounds
- Table 38 to Subpart G of Part 63—Toxic Equivalency Factors
- Figure 1 to Subpart G of Part 63—Definitions of Terms Used in Wastewater Equations
- § 63.160 Applicability and designation of source.
- § 63.161 Definitions.
- § 63.162 Standards: General.
- § 63.163 Standards: Pumps in light liquid service.
- § 63.164 Standards: Compressors.
- § 63.165 Standards: Pressure relief devices in gas/vapor service or light liquid service.
- § 63.166 Standards: Sampling connection systems.
- § 63.167 Standards: Open-ended valves or lines.
- § 63.168 Standards: Valves in gas/vapor service and in light liquid service.
- § 63.169 Standards: Pumps, valves, connectors, and agitators in heavy liquid service; instrumentation systems; and pressure relief devices in liquid service.
- § 63.170 Standards: Surge control vessels and bottoms receivers.
- § 63.171 Standards: Delay of repair.
- § 63.172 Standards: Closed-vent systems and control devices.
- § 63.173 Standards: Agitators in gas/vapor service and in light liquid service.
- § 63.174 Standards: Connectors in gas/vapor service and in light liquid service.
- § 63.175 Quality improvement program for valves.
- § 63.176 Quality improvement program for pumps.
- § 63.177 Alternative means of emission limitation: General.
- § 63.178 Alternative means of emission limitation: Batch processes.
- § 63.179 Alternative means of emission limitation: Enclosed-vented process units.
- § 63.180 Test methods and procedures.
- § 63.181 Recordkeeping requirements.
- § 63.182 Reporting requirements.
- § 63.183 Implementation and enforcement.
- § 63.184 Fenceline monitoring provisions.
- Table 1 to Subpart H of Part 63—Batch Processes
- Table 2 to Subpart H of Part 63—Surge Control Vessels and Bottoms Receivers at Existing Sources
- Table 3 to Subpart H of Part 63—Surge Control Vessels and Bottoms Receivers at New Sources
- Table 4 to Subpart H of Part 63—Applicable 40 CFR Part 63 General Provisions
- § 63.190 Applicability and designation of source.
- § 63.191 Definitions.
- § 63.192 Standard.
- § 63.193 Implementation and enforcement.
- § 63.210 What is the purpose of this subpart?
- § 63.211 Am I subject to this subpart?
- § 63.212 What parts of my facility does this subpart cover?
- § 63.213 When do I have to comply with this subpart?
- § 63.214 What are the requirements I must comply with?
- § 63.215 What General Provisions apply to me?
- § 63.216 Who administers this subpart?
- § 63.217 What definitions apply to this subpart?
- § 63.300 Applicability.
- § 63.301 Definitions.
- § 63.302 Standards for by-product coke oven batteries.
- § 63.303 Standards for nonrecovery coke oven batteries.
- § 63.304 Standards for compliance date extension.
- § 63.305 Alternative standards for coke oven doors equipped with sheds.
- § 63.306 Work practice standards.
- § 63.307 Standards for bypass/bleeder stacks.
- § 63.308 Standards for collecting mains.
- § 63.309 Performance tests and procedures.
- § 63.310 [Reserved]
- § 63.311 Reporting and recordkeeping requirements.
- § 63.312 Existing regulations and requirements.
- § 63.313 Implementation and enforcement.
- § 63.314 Fenceline monitoring provisions.
- Appendix A to Subpart L of Part 63—Operating Coke Oven Batteries as of April 1, 1992
- § 63.320 Applicability.
- § 63.321 Definitions.
- § 63.322 Standards.
- § 63.323 Test methods and monitoring.
- § 63.324 Reporting and recordkeeping requirements.
- § 63.325 Determination of equivalent emission control technology.
- § 63.326 Implementation and enforcement.
- § 63.340 Applicability and designation of sources.
- § 63.341 Definitions and nomenclature.
- § 63.342 Standards.
- § 63.343 Compliance provisions.
- § 63.344 Performance test requirements and test methods.
- § 63.345 Provisions for new and reconstructed sources.
- § 63.346 Recordkeeping requirements.
- § 63.347 Reporting requirements.
- § 63.348 Implementation and enforcement.
- Table 1 to Subpart N of Part 63—General Provisions Applicability to Subpart N
- § 63.360 Applicability.
- § 63.361 Definitions.
- § 63.362 Standards.
- § 63.363 Compliance and performance provisions.
- § 63.364 Monitoring requirements.
- § 63.365 Test methods and procedures.
- § 63.366 Reporting requirements.
- § 63.367 Recordkeeping requirements.
- § 63.368 Implementation and enforcement.
- Table 1 to Subpart O of Part 63—Standards for SCVs
- Table 2 to Subpart O of Part 63—Standards for ARVs
- Table 3 to Subpart O of Part 63—Standards for CEVs
- Table 4 to Subpart O of Part 63—Standards for Group 1 Room Air Emissions
- Table 5 to Subpart O of Part 63—Standards for Group 2 Room Air Emissions
- Table 6 to Subpart O of Part 63—Applicability of General Provisions to This Subpart
- § 63.400 Applicability.
- § 63.401 Definitions.
- § 63.402 Standard.
- § 63.403 Compliance dates.
- § 63.404 Compliance demonstrations.
- § 63.405 Notification requirements.
- § 63.406 Recordkeeping and reporting requirements.
- § 63.407 Implementation and enforcement.
- Table 1 to Subpart Q of Part 63—General Provisions Applicability to Subpart Q
- § 63.420 Applicability.
- § 63.421 Definitions.
- § 63.422 Standards: Loading racks.
- § 63.423 Standards: Storage vessels.
- § 63.424 Standards: Equipment leaks.
- § 63.425 Test methods and procedures.
- § 63.426 Alternative means of emission limitation.
- § 63.427 Continuous monitoring.
- § 63.428 Recordkeeping and reporting.
- § 63.429 Implementation and enforcement.
- Table 1 to Subpart R of Part 63—General Provisions Applicability to This Subpart
- § 63.440 Applicability.
- § 63.441 Definitions.
- § 63.442 [Reserved]
- § 63.443 Standards for the pulping system at kraft, soda, and semi-chemical processes.
- § 63.444 Standards for the pulping system at sulfite processes.
- § 63.445 Standards for the bleaching system.
- § 63.446 Standards for kraft pulping process condensates.
- § 63.447 Clean condensate alternative.
- §§ 63.448-63.449 [Reserved]
- § 63.450 Standards for enclosures and closed-vent systems.
- §§ 63.451-63.452 [Reserved]
- § 63.453 Monitoring requirements.
- § 63.454 Recordkeeping requirements.
- § 63.455 Reporting requirements.
- § 63.456 Affirmative defense for violation of emission standards during malfunction.
- § 63.457 Test methods and procedures.
- § 63.458 Implementation and enforcement.
- § 63.459 Alternative standards.
- Table 1 to Subpart S of Part 63—General Provisions Applicability to Subpart S a
- § 63.460 Applicability and designation of source.
- § 63.461 Definitions.
- § 63.462 Batch cold cleaning machine standards.
- § 63.463 Batch vapor and in-line cleaning machine standards.
- § 63.464 Alternative standards.
- § 63.465 Test methods.
- § 63.466 Monitoring procedures.
- § 63.467 Recordkeeping requirements.
- § 63.468 Reporting requirements.
- § 63.469 Equivalent methods of control.
- § 63.470 Implementation and enforcement.
- § 63.471 Facility-wide standards.
- Appendix B to Subpart T of Part 63—General Provisions Applicability to Subpart T
- § 63.480 Applicability and designation of affected sources.
- § 63.481 Compliance dates and relationship of this subpart to existing applicable rules.
- § 63.482 Definitions.
- § 63.483 Emission standards.
- § 63.484 Storage vessel provisions.
- § 63.485 Continuous front-end process vent provisions.
- § 63.486 Batch front-end process vent provisions.
- § 63.487 Batch front-end process vents—reference control technology.
- § 63.488 Methods and procedures for batch front-end process vent group determination.
- § 63.489 Batch front-end process vents—monitoring equipment.
- § 63.490 Batch front-end process vents—performance test methods and procedures to determine compliance.
- § 63.491 Batch front-end process vents—recordkeeping requirements.
- § 63.492 Batch front-end process vents—reporting requirements.
- § 63.493 Back-end process provisions.
- § 63.494 Back-end process provisions—residual organic HAP and emission limitations.
- § 63.495 Back-end process provisions—procedures to determine compliance with residual organic HAP limitations using stripping technology and organic HAP emissions limitations.
- § 63.496 Back-end process provisions—procedures to determine compliance with residual organic HAP limitations using control or recovery devices.
- § 63.497 Back-end process provisions—monitoring provisions for control and recovery devices used to comply with residual organic HAP limitations.
- § 63.498 Back-end process provisions—recordkeeping.
- § 63.499 Back-end process provisions—reporting.
- § 63.500 Back-end process provisions—carbon disulfide limitations for styrene butadiene rubber by emulsion processes.
- § 63.501 Wastewater provisions.
- § 63.502 Equipment leak, fenceline monitoring, and heat exchange system provisions.
- § 63.503 Emissions averaging provisions.
- § 63.504 Additional requirements for performance testing.
- § 63.505 Parameter monitoring levels and excursions.
- § 63.506 General recordkeeping and reporting provisions.
- § 63.507 Implementation and enforcement.
- § 63.508 Flare requirements.
- § 63.509 Procedures for determining whether process vents, storage vessels, or wastewater are in chloroprene service.
- § 63.510 Process vents, storage vessels, and wastewater that are in chloroprene service—procedures to determine compliance.
- Table 1 to Subpart U of Part 63—Applicability of General Provisions to Subpart U Affected Sources
- Table 2 to Subpart U of Part 63—Applicability of Subparts F, G, & H of This Part to Subpart U Affected Sources
- Table 3 to Subpart U of Part 63—Group 1 Storage Vessels at Existing Affected Sources
- Table 4 to Subpart U of Part 63—Group 1 Storage Vessels at New Sources
- Table 5 to Subpart U of Part 63—Known Organic HAP Emitted From the Production of Elastomer Products
- Table 6 to Subpart U of Part 63—Group 1 Batch Front-End Process Vents and Aggregate Batch Vent Streams—Monitoring, Recordkeeping, and Reporting Requirements
- Table 7 to Subpart U of Part 63—Operating Parameters for Which Monitoring Levels Are Required To Be Established for Continuous and Batch Front-End Process Vents and Aggregate Batch Vent Streams
- Table 8 to Subpart U of Part 63—Summary of Compliance Alternative Requirements for the Back-End Process Provisions
- Table 9 to Subpart U of Part 63—Routine Reports Required by This Subpart
- Table 10 to Subpart U of Part 63—Toxic Equivalency Factors
- § 63.520 Applicability and designation of sources.
- § 63.521 Compliance schedule.
- § 63.522 Definitions.
- § 63.523 Standards for basic liquid resins manufacturers.
- § 63.524 Standards for wet strength resins manufacturers.
- § 63.525 Compliance and performance testing.
- § 63.526 Monitoring requirements.
- § 63.527 Recordkeeping requirements.
- § 63.528 Reporting requirements.
- § 63.529 Implementation and enforcement.
- Table 1 to Subpart W of Part 63—General Provisions Applicability to Subpart W
- Table 2 to Subpart W of Part 63—Toxic Equivalency Factors
- § 63.541 Applicability.
- § 63.542 Definitions.
- § 63.543 What are my standards for process vents?
- § 63.544 What are my total enclosure standards?
- § 63.545 What are my standards for fugitive dust sources?
- § 63.546 Compliance dates.
- § 63.547 Test methods.
- § 63.548 Monitoring requirements.
- § 63.549 Notification requirements.
- § 63.550 Recordkeeping and reporting requirements.
- § 63.551 Implementation and enforcement.
- § 63.552 Affirmative defense to civil penalties for exceedance of emissions limit during malfunction.
- Table 1 to Subpart X of Part 63—General Provisions Applicability to Subpart X
- Table 2 to Subpart X of Part 63—Emissions Limits for Secondary Lead Smelting Furnaces
- Table 3 to Subpart X of Part 63—Toxic Equivalency Factors
- § 63.560 Applicability and designation of affected source.
- § 63.561 Definitions.
- § 63.562 Standards.
- § 63.563 Compliance and performance testing.
- § 63.564 Monitoring requirements.
- § 63.565 Test methods and procedures.
- § 63.566 Construction and reconstruction.
- § 63.567 Recordkeeping and reporting requirements.
- § 63.568 Implementation and enforcement.
- §§ 63.569-63.599 [Reserved]