---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchN/part403"
level: "part"
label: "Part 403"
heading: "General Pretreatment Regulations for Existing and New Sources of Pollution"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchN-part403"
sections_count: 20
---

# Part 403 — General Pretreatment Regulations for Existing and New Sources of Pollution

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter N — Effluent Guidelines and Standards

## Sections

- [§403.1. Purpose and applicability.](/cfr/40/403.1.md)
- [§403.2. Objectives of general pretreatment regulations.](/cfr/40/403.2.md)
- [§403.3. Definitions.](/cfr/40/403.3.md)
- [§403.4. State or local law.](/cfr/40/403.4.md)
- [§403.5. National pretreatment standards: Prohibited discharges.](/cfr/40/403.5.md)
- [§403.6. National pretreatment standards: Categorical standards.](/cfr/40/403.6.md)
- [§403.7. Removal credits.](/cfr/40/403.7.md)
- [§403.8. Pretreatment Program Requirements: Development and Implementation by POTW.](/cfr/40/403.8.md)
- [§403.9. POTW pretreatment programs and/or authorization to revise pretreatment standards: Submission for approval.](/cfr/40/403.9.md)
- [§403.10. Development and submission of NPDES State pretreatment programs.](/cfr/40/403.10.md)
- [§403.11. Approval procedures for POTW pretreatment programs and POTW granting of removal credits.](/cfr/40/403.11.md)
- [§403.12. Reporting requirements for POTW's and industrial users.](/cfr/40/403.12.md)
- [§403.13. Variances from categorical pretreatment standards for fundamentally different factors.](/cfr/40/403.13.md)
- [§403.14. Confidentiality.](/cfr/40/403.14.md)
- [§403.15. Net/Gross calculation.](/cfr/40/403.15.md)
- [§403.16. Upset provision.](/cfr/40/403.16.md)
- [§403.17. Bypass.](/cfr/40/403.17.md)
- [§403.18. Modification of POTW pretreatment programs.](/cfr/40/403.18.md)
- [§403.19. Provisions of specific applicability to the Owatonna Waste Water Treatment Facility.](/cfr/40/403.19.md)
- [§403.20. Pretreatment Program Reinvention Pilot Projects Under Project XL.](/cfr/40/403.20.md)