Federal Regulations and the Code of Federal Regulations (CFR)

The Code of Federal Regulations (CFR) is the official compilation of all permanent rules published by federal executive departments and agencies of the United States government. Organized into 50 subject-matter titles, the CFR carries the force of law and governs an enormous range of activity — from food safety standards to financial reporting requirements to environmental discharge limits. Understanding its structure is essential for anyone navigating administrative law and agencies, interpreting regulatory compliance obligations, or tracing the legal authority behind an agency's enforcement action.

Definition and scope

The CFR is the codified form of the general and permanent rules issued by federal agencies pursuant to authority delegated by Congress. It is maintained by the Office of the Federal Register (OFR), a component of the National Archives and Records Administration (NARA), and is published annually in printed form — with each of the 50 titles updated on a rolling quarterly schedule (Office of the Federal Register).

The CFR exists within a broader hierarchy of law. Congress enacts statutes through the legislative process described under how laws are made in the US; agencies then translate those statutes into enforceable operational rules through the regulatory process. The CFR captures the output of that translation. Each CFR title corresponds to a broad subject area:

• Title 21 — Food and Drugs (FDA)
• Title 26 — Internal Revenue (IRS)
• Title 29 — Labor (OSHA, NLRB, and others)
• Title 40 — Protection of Environment (EPA)
• Title 49 — Transportation (DOT, FMCSA, FAA)

Each title is further divided into chapters (assigned to specific agencies), parts (covering discrete regulatory programs), sections (individual rule provisions), and paragraphs. A CFR citation follows the form Title § Part.Section — for example, 29 C.F.R. § 1910.1200 refers to OSHA's Hazard Communication Standard.

The distinction between the CFR and the Federal Register is foundational: the Federal Register is the daily journal in which proposed and final rules are first published, while the CFR is the permanent, codified record of rules currently in force. The two are used together — a Federal Register preamble provides the legal rationale behind a rule, while the CFR provides the operative text (Government Publishing Office).

How it works

Federal agencies acquire rulemaking authority through enabling statutes — congressional acts that delegate specific regulatory power. The Administrative Procedure Act (APA), codified at 5 U.S.C. §§ 551–559 and 701–706, establishes the procedural framework that governs how agencies create, amend, and repeal regulations (Legal Information Institute, Cornell Law School).

The standard rulemaking sequence under the APA proceeds through discrete phases:

1. Advance Notice of Proposed Rulemaking (ANPRM) — optional preliminary notice soliciting public input on whether and how to regulate.
2. Notice of Proposed Rulemaking (NPRM) — publication in the Federal Register of the proposed rule text with a public comment period, typically 30 to 60 days.
3. Public comment period — any person may submit written comments; agencies must consider all substantive submissions.
4. Final Rule publication — agency responds to significant comments, publishes the final rule text in the Federal Register, specifies the effective date (generally at least 30 days after publication under 5 U.S.C. § 553(d)).
5. Codification — OFR incorporates the final rule text into the appropriate CFR title and section.

Certain agency actions qualify as informal rulemaking (notice-and-comment) under § 553 of the APA, while others — including rules affecting military or foreign affairs functions, agency management, and most adjudicatory proceedings — are exempt from standard notice-and-comment requirements.

Agencies may also issue guidance documents, which interpret existing rules but do not carry the binding legal force of a CFR provision. Distinguishing a binding regulation from non-binding agency guidance is a recurring issue in administrative litigation and connects directly to the doctrine of judicial deference as addressed under administrative law and agencies.

Common scenarios

Workplace safety compliance. OSHA regulations published in 29 C.F.R. Parts 1910 (general industry) and 1926 (construction) set enforceable safety standards. An employer whose facility is inspected under these provisions faces penalties measured against the specific CFR section allegedly violated, not against a general statutory standard. OSHA's maximum civil penalty for a willful or repeated violation is $156,259 per violation as adjusted by the Federal Civil Penalties Inflation Adjustment Act Improvements Act of 2015 (OSHA Penalties).

Environmental permitting. The EPA's regulations at 40 C.F.R. Part 122 govern the National Pollutant Discharge Elimination System (NPDES) permit program under the Clean Water Act. Facilities that discharge pollutants into navigable waters must hold a valid NPDES permit whose conditions are defined by reference to specific CFR sections.

Food labeling requirements. The FDA's nutrition labeling regulations at 21 C.F.R. Part 101 specify mandatory label elements, serving size definitions, and nutrient declaration formats. A food manufacturer seeking to determine whether a label is legally compliant must consult the CFR directly, not the underlying statutory text of the Federal Food, Drug, and Cosmetic Act alone.

Financial institution regulation. Federal Reserve regulations implementing the Bank Holding Company Act and Dodd-Frank Act provisions appear in 12 C.F.R. Each Federal Reserve regulation carries an alphabetic letter designation (e.g., Regulation Z for the Truth in Lending Act disclosures at 12 C.F.R. Part 1026).

These scenarios illustrate a consistent pattern: regulated parties must identify the relevant CFR title and section, not merely the underlying statute, to determine the operative compliance standard.

Decision boundaries

The CFR is not the only source of binding federal legal obligation, and its relationship to other legal authorities requires precise classification. The table below contrasts the CFR with adjacent legal instruments:

Three boundary questions arise with regularity:

Preemption. When a CFR provision conflicts with a state regulation, federal law generally prevails under the Supremacy Clause of the U.S. Constitution. However, preemption is not automatic — courts examine whether Congress expressed a clear intent to preempt or whether the regulatory scheme is so pervasive as to occupy the field. This dynamic is explored under federalism and state law preemption.

Scope of delegation. An agency may only promulgate regulations within the scope of authority granted by its enabling statute. A regulation that exceeds that grant is subject to invalidation under the APA's arbitrary-and-capricious standard (5 U.S.C. § 706) or on major-questions grounds as addressed by the U.S. Supreme Court in West Virginia v. EPA, 597 U.S. 697 (2022). The role of courts in reviewing these boundaries is detailed under judicial review in the US.

Effective date vs. enforcement date. A final rule's effective date — the date it becomes part of the CFR — may differ from any phased compliance deadline the rule establishes. Regulated entities must distinguish between the date a rule takes legal effect and the date compliance is required, as enforcement actions under the sources of American law framework can turn on this distinction.

The electronic CFR (eCFR), maintained at ecfr.gov, is updated within days of Federal Register publication and provides section-level version history, though the Government Publishing Office (GPO) print edition remains the official legal text for citation purposes (GPO).

References

• Office of the Federal Register — Understanding the Federal Register and CFR
• Electronic Code of Federal Regulations (eCFR) — Government Publishing Office
• Administrative Procedure Act, 5 U.S.C. §§ 551–706 — Legal Information Institute, Cornell Law School
• OSHA Civil Penalty Schedule — U.S. Department of Labor
• GovInfo CFR Collection — Government Publishing Office
• National Archives and Records Administration — Federal Register
• West Virginia v. EPA, 597 U.S. 697 (2022) — Supreme Court of the United States