U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 403 - PART 403—GENERAL PRETREATMENT REGULATIONS FOR EXISTING AND NEW SOURCES OF POLLUTION
§ 403.1 - Purpose and applicability.
§ 403.2 - Objectives of general pretreatment regulations.
§ 403.3 - Definitions.
§ 403.4 - State or local law.
§ 403.5 - National pretreatment standards: Prohibited discharges.
§ 403.6 - National pretreatment standards: Categorical standards.
§ 403.7 - Removal credits.
§ 403.8 - Pretreatment Program Requirements: Development and Implementation by POTW.
§ 403.9 - POTW pretreatment programs and/or authorization to revise pretreatment standards: Submission for approval.
§ 403.10 - Development and submission of NPDES State pretreatment programs.
§ 403.11 - Approval procedures for POTW pretreatment programs and POTW granting of removal credits.
§ 403.12 - Reporting requirements for POTW's and industrial users.
§ 403.13 - Variances from categorical pretreatment standards for fundamentally different factors.
§ 403.14 - Confidentiality.
§ 403.15 - Net/Gross calculation.
§ 403.16 - Upset provision.
§ 403.17 - Bypass.
§ 403.18 - Modification of POTW pretreatment programs.
§ 403.19 - Provisions of specific applicability to the Owatonna Waste Water Treatment Facility.
§ 403.20 - Pretreatment Program Reinvention Pilot Projects Under Project XL.
Appendix - Appendixes A-C to Part 403 [Reserved]
Appendix Appendix D - Appendix D to Part 403—Selected Industrial Subcategories Considered Dilute for Purposes of the Combined Wastestream Formula
Appendix Appendix E - Appendix E to Part 403—Sampling Procedures
Appendix Appendix F - Appendix F to Part 403 [Reserved]
Appendix Appendix G - Appendix G to Part 403—Pollutants Eligible for a Removal Credit
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