---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchA/part11"
level: "part"
label: "Part 11"
heading: "Security Classification Regulations Pursuant to Executive Order 11652"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchA-part11"
sections_count: 6
---

# Part 11 — Security Classification Regulations Pursuant to Executive Order 11652

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

## Sections

- [§11.1. Purpose.](/cfr/40/11.1.md)
- [§11.2. Background.](/cfr/40/11.2.md)
- [§11.3. Responsibilities.](/cfr/40/11.3.md)
- [§11.4. Definitions.](/cfr/40/11.4.md)
- [§11.5. Procedures.](/cfr/40/11.5.md)
- [§11.6. Access by historical researchers and former Government officials.](/cfr/40/11.6.md)