---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchD/part120"
level: "part"
label: "Part 120"
heading: "Definition of Waters of the United States"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchD-part120"
sections_count: 2
---

# Part 120 — Definition of Waters of the United States

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

## Sections

- [§120.1. Purpose and scope.](/cfr/40/120.1.md)
- [§120.2. Definitions.](/cfr/40/120.2.md)