---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchD/part124"
level: "part"
label: "Part 124"
heading: "Procedures for Decisionmaking"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchD-part124"
sections_count: 57
---

# Part 124 — Procedures for Decisionmaking

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter D — Water Programs

## Contents

- [Subpart A — General Program Requirements](/cfr/40/chI-subchD-part124-subpartA.md)
- [Subpart B — Specific Procedures Applicable to RCRA Permits](/cfr/40/chI-subchD-part124-subpartB.md)
- [Subpart C — Specific Procedures Applicable to PSD Permits](/cfr/40/chI-subchD-part124-subpartC.md)
- [Subpart D — Specific Procedures Applicable to NPDES Permits](/cfr/40/chI-subchD-part124-subpartD.md)
- [Subpart E-F — Subparts E-F [Reserved]](/cfr/40/chI-subchD-part124-subpartE-F.md)
- [Subpart G — Procedures for RCRA Standardized Permit](/cfr/40/chI-subchD-part124-subpartG.md)