---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchD/part117"
level: "part"
label: "Part 117"
heading: "Determination of Reportable Quantities for Hazardous Substances"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchD-part117"
sections_count: 9
---

# Part 117 — Determination of Reportable Quantities for Hazardous Substances

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

## Contents

- [Subpart A — General Provisions](/cfr/40/chI-subchD-part117-subpartA.md)
- [Subpart B — Applicability](/cfr/40/chI-subchD-part117-subpartB.md)
- [Subpart C — Notice of Discharge of a Reportable Quantity](/cfr/40/chI-subchD-part117-subpartC.md)