U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 63Subpart DD - Subpart DD—National Emission Standards for Hazardous Air Pollutants from Off-Site Waste and Recovery Operations
§ 63.680 - Applicability and designation of affected sources.
§ 63.681 - Definitions.
§ 63.682 - [Reserved]
§ 63.683 - Standards: General.
§ 63.684 - Standards: Off-site material treatment.
§ 63.685 - Standards: Tanks.
§ 63.686 - Standards: Oil-water and organic-water separators.
§ 63.687 - Standards: Surface impoundments.
§ 63.688 - Standards: Containers.
§ 63.689 - Standards: Transfer systems.
§ 63.690 - Standards: Process vents.
§ 63.691 - Standards: Equipment leaks.
§ 63.692 - [Reserved]
§ 63.693 - Standards: Closed-vent systems and control devices.
§ 63.694 - Testing methods and procedures.
§ 63.695 - Inspection and monitoring requirements.
§ 63.696 - Recordkeeping requirements.
§ 63.697 - Reporting requirements.
§ 63.698 - Implementation and enforcement.
Appendix - Table 1 to Subpart DD of Part 63—List of Hazardous Air Pollutants (HAP) for Subpart DD
Appendix - Table 2 to Subpart DD of Part 63—Applicability of Paragraphs in Subpart A of This Part 63—General Provisions to Subpart DD
Appendix - Table 3 to Subpart DD of Part 63—Tank Control Levels for Tanks at Existing Affected Sources as Required by 40 CFR 63.685(b)(1)
Appendix - Table 4 to Subpart DD of Part 63—Tank Control Levels for Tanks at Existing Affected Sources as Required by 40 CFR 63.685(b)(1)(ii)
Appendix - Table 5 to Subpart DD of Part 63—Tank Control Levels for Tanks at New Affected Sources as Required by 40 CFR 63.685(b)(2)
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