What Is 33 CFR

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Last updated: April 15, 2026

Quick Answer: 33 CFR stands for Title 33 of the Code of Federal Regulations, which governs navigation and navigable waters in the United States. It is enforced by agencies including the U.S. Coast Guard and covers rules from bridge operations to pollution prevention.

Key Facts

33 CFR contains over 150 parts regulating U.S. navigable waters and maritime activities
The U.S. Coast Guard enforces most provisions under 33 CFR
Part 165 establishes safety and security zones around vessels and waterfront facilities
33 CFR § 117 governs drawbridge operation schedules and requirements
Regulations were first codified in 1949 as part of the CFR system

Overview

33 CFR, or Title 33 of the Code of Federal Regulations, is the primary set of federal rules governing maritime and navigational activities within the United States. It encompasses a broad range of regulations designed to ensure the safety, security, and environmental protection of U.S. navigable waters, including coastal zones, rivers, and inland waterways.

Administered primarily by the U.S. Coast Guard and other federal agencies, 33 CFR is updated regularly in the Federal Register and published annually. It provides legal authority for vessel operations, port security, pollution control, and bridge management across more than 150 distinct regulatory parts.

Scope: 33 CFR applies to all vessels operating in U.S. navigable waters, including commercial ships, recreational boats, and foreign-flagged vessels within U.S. jurisdiction.
Enforcement: The U.S. Coast Guard is the primary agency responsible for enforcing 33 CFR regulations, conducting inspections, and issuing penalties for noncompliance.
Historical Basis: Title 33 was formally codified in 1949 when the Code of Federal Regulations was established, consolidating earlier maritime laws and executive orders.
Environmental Rules: Part 151 of 33 CFR implements MARPOL Annex I and regulates oil discharge, garbage disposal, and ballast water management to prevent marine pollution.
Security Zones: Part 165 authorizes the creation of regulated navigation areas and security zones near military installations, nuclear facilities, and major ports.

How It Works

33 CFR operates through a structured framework of rules categorized by function, jurisdiction, and vessel type. Each part addresses specific regulatory needs, from vessel safety standards to operational restrictions in sensitive zones.

Part 67 – Aids to Navigation: Requires private aids to navigation to meet U.S. Coast Guard standards and be registered, ensuring consistency with federal maritime charts.
Part 104 – Vessel Security: Mandates security plans for vessels over 100 gross tons on international voyages, aligning with the International Ship and Port Facility Security (ISPS) Code.
Part 117 – Drawbridge Operation: Specifies when drawbridges must open for marine traffic, with over 250 regulated bridges nationwide following published schedules.
Part 147 – Offshore LNG Facilities: Establishes safety zones of 500 yards around liquefied natural gas terminals and floating storage units.
Part 155 – Oil Spill Response: Requires tank vessels and facilities to have certified response plans capable of handling worst-case discharge scenarios.
Part 162 – Inland Waterways: Sets speed limits, right-of-way rules, and restricted areas on rivers such as the Mississippi and Ohio.

Comparison at a Glance

The following table compares key sections of 33 CFR with related statutes and international standards:

33 CFR Part	Regulatory Focus	Enforcement Agency	Key Requirement
Part 151	Marine Pollution	U.S. Coast Guard	Prohibits oil discharge within 12 nautical miles of shore unless treated and below 15 ppm concentration.
Part 165	Security Zones	Coast Guard & DHS	Authorizes temporary and permanent zones around high-risk facilities, with penalties up to $10,000 per violation.
Part 117	Drawbridge Operations	USCG & State Authorities	Requires minimum 12 openings per day on major waterways unless exempted.
Part 106	Port Security	U.S. Coast Guard	Mandates access control and patrols at Outer Continental Shelf facilities.
Part 143	Offshore Platforms	BSEE & USCG	Requires emergency plans for platforms located in waters deeper than 100 feet.

These regulations work in concert with international agreements such as SOLAS and MARPOL, ensuring U.S. compliance with global maritime standards. While some parts apply nationwide, others are location-specific, such as security zones during presidential visits or major public events like the Super Bowl.

Why It Matters

Understanding 33 CFR is essential for mariners, port operators, and regulatory agencies to maintain legal compliance and operational safety. Violations can result in fines, vessel detention, or criminal charges, especially in cases involving pollution or security breaches.

Commercial Shipping: Vessels over 300 gross tons must comply with 33 CFR Part 155, including having a Coast Guard-approved oil spill response plan on file.
Recreational Boaters: Operators must follow speed limits and no-wake zones defined under Part 162, particularly near bridges and in congested harbors.
Environmental Protection: 33 CFR supports the Clean Water Act by enforcing discharge prohibitions and requiring reporting of any accidental spills.
Port Operations: Terminal operators must coordinate with the Coast Guard under 33 CFR Part 104 to implement facility security plans.
Emergency Response: The regulations provide a legal basis for Coast Guard intervention during oil spills, search and rescue, and maritime security incidents.
Legal Liability: Noncompliance with 33 CFR can lead to civil penalties up to $37,500 per day under federal law.

As maritime traffic and offshore energy activities grow, 33 CFR remains a foundational element of U.S. waterway governance, balancing safety, commerce, and environmental stewardship.