---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchO"
level: "subchap"
label: "Subchapter O"
heading: "Sewage Sludge"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchO"
sections_count: 62
---

# Subchapter O — Sewage Sludge

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency

## Contents

- [Part 501 — State Sludge Management Program Regulations](/cfr/40/chI-subchO-part501.md)
- [Part 503 — Standards for the Use or Disposal of Sewage Sludge](/cfr/40/chI-subchO-part503.md)