National Marine Sanctuaries

The National Marine Sanctuaries Act (16 U.S.C. §§ 1431–1445c) authorizes the Secretary of Commerce to designate and protect areas of the marine environment with special national significance — for their conservation, recreational, ecological, historical, scientific, cultural, or aesthetic qualities. The National Marine Sanctuary System currently includes 15 national marine sanctuaries and 2 marine national monuments, protecting more than 620,000 square miles of ocean and Great Lakes waters — from coral reefs in the Florida Keys to deep-sea canyons off New England to the Papahānaumokuākea Marine National Monument in the Northwestern Hawaiian Islands. Administered by NOAA's Office of National Marine Sanctuaries, the system is often described as "underwater national parks," though sanctuaries typically allow more compatible uses (including sustainable fishing) than their terrestrial counterparts.

Current Law (2026)

Parameter	Value
Governing law	16 U.S.C. §§ 1431–1445c (National Marine Sanctuaries Act, 1972; reauthorized and amended multiple times)
Administrator	NOAA Office of National Marine Sanctuaries (Commerce Department)
Sites	15 national marine sanctuaries + 2 marine national monuments
Protected area	620,000+ square miles
Designation authority	Secretary of Commerce, through a public process
Prohibited activities	Destroying, damaging, or causing loss of sanctuary resources; taking protected resources; discharging pollutants (varies by sanctuary)
Special use permits	Secretary may issue permits for research, education, and compatible activities
Damage liability	Strict liability for destruction or injury to sanctuary resources — full cost of response, restoration, and damages
Enforcement	NOAA enforcement; civil penalties; criminal penalties for knowing violations
Examples	Florida Keys, Monterey Bay, Stellwagen Bank, Olympic Coast, Channel Islands, Papahānaumokuākea

Legal Authority

16 U.S.C. § 1431 — Findings, purposes, and policies (Congress found that the U.S. has protected land extensively but not ocean; establishes the National Marine Sanctuary System to identify, protect, and manage marine areas of special national significance)
16 U.S.C. § 1433 — Sanctuary designation standards (Secretary may designate a sanctuary if the area meets program goals, is of special national significance, existing regulations are inadequate, and the benefits of designation outweigh the costs)
16 U.S.C. § 1434 — Procedures for designation (requires publication of proposed regulations and management plan, environmental review, public comment, Congressional notification, and a 45-day Congressional review period before final designation)
16 U.S.C. § 1436 — Prohibited activities (unlawful to destroy, cause the loss of, or injure any sanctuary resource; take any sanctuary resource; possess, sell, or transport sanctuary resources taken in violation; violate sanctuary regulations)
16 U.S.C. § 1437 — Enforcement (NOAA authorized to enforce sanctuary regulations; officers may board, search, inspect, and seize vessels; civil penalties for violations)
16 U.S.C. § 1440 — Research, monitoring, and education (Secretary must conduct research, monitoring, and education programs; may partner with states, academic institutions, and nonprofits)
16 U.S.C. § 1441 — Special use permits (Secretary may issue special use permits allowing specific activities inside sanctuaries that are consistent with the management plan — including research, education, and commercial activities that further the sanctuary's goals; permits must specify conditions and may require fees)
16 U.S.C. § 1442 — Cooperative agreements, donations, and acquisitions (Secretary may enter cooperative agreements with states, local governments, universities, nonprofits, and other entities to carry out sanctuary programs; may accept donations of property and funds; may acquire sanctuary lands by purchase, donation, or exchange)
16 U.S.C. § 1443 — Destruction or loss of sanctuary resources (any person who destroys or injures sanctuary resources is liable for response costs, restoration costs, and the value of lost resources — strict liability, not requiring proof of negligence)

How It Works

Designation process follows a structured public procedure. NOAA identifies candidate sites through a nomination process, evaluates their national significance, and publishes a proposed designation with draft regulations and a management plan. Public comment is solicited, environmental review under NEPA is conducted, and the Governor of any affected state is consulted. After the final designation is published, Congress has a 45-day review period during which it can disapprove by joint resolution. Each sanctuary has site-specific regulations tailored to its unique resources and threats.

Site-specific management means no two sanctuaries are alike. The Florida Keys National Marine Sanctuary (2,900 square nautical miles) regulates anchoring on coral reefs, restricts fishing in ecological reserves, and manages the most-visited sanctuary in the system. Monterey Bay (6,094 square nautical miles, one of the largest) protects kelp forests, deep-sea canyons, and abundant marine mammals. Papahānaumokuākea Marine National Monument (582,578 square miles, the largest) — originally designated by presidential proclamation and incorporated into the sanctuary system — protects one of the most remote and pristine marine ecosystems on earth. Each sanctuary has its own regulations, management plan, and advisory council.

Allowed and prohibited activities vary by sanctuary. Unlike wilderness areas, most sanctuaries allow sustainable fishing (regulated under Magnuson-Stevens and state law), recreational boating, diving, and other compatible uses. What's universally prohibited is damaging or destroying sanctuary resources — which includes anchoring on coral, discharging pollutants, disturbing historical artifacts (like shipwrecks), and taking protected species (see Endangered Species Act). Some sanctuaries have additional restrictions: zones prohibiting all extractive activity, anchoring restrictions, vessel speed limits, and military activity protocols.

Strict liability for damage is one of the Act's most powerful enforcement tools. Any person who destroys, causes the loss of, or injures a sanctuary resource is liable for the full cost of response (containing the damage), restoration (returning the resource to its pre-damage condition), and the value of lost resources (ecological services, recreational value). Liability is strict — you don't need to be negligent. When a vessel grounds on a coral reef in the Florida Keys sanctuary, the owner is liable for the full cost of coral restoration, which can reach millions of dollars.

Advisory councils at each sanctuary provide public input. Councils include representatives from local government, commercial fishing, recreational fishing, conservation, tourism, education, research, and other community interests. They advise the sanctuary superintendent on management issues and serve as a bridge between the sanctuary and the local community.

How It Affects You

If you're a recreational boater or diver, sanctuary designation means your access is protected in law — but so are the rules that govern what you can do inside the sanctuary. The most important regulation to know before you drop anchor or dive: anchoring on coral is prohibited in all marine sanctuaries, and the damage it causes triggers strict liability under 16 U.S.C. § 1443. In the Florida Keys National Marine Sanctuary — the most visited in the system — mandatory mooring buoys are available in coral areas; use them, because a single anchor drop on coral can cost you thousands in resource damages if an enforcement officer witnesses it. No-discharge zones apply to vessel sewage in most sanctuaries, and many sanctuaries have speed restrictions in areas with high manatee or marine mammal activity. The specific regulations for each of the 15 sanctuaries vary significantly: get the site-specific regulations at sanctuaries.noaa.gov before you boat or dive in any sanctuary you're not already familiar with. NOAA sanctuary enforcement officers have arrest authority, and civil penalties for violations start at $100,000 per day for serious violations. If you find mooring buoys occupied, contact the sanctuary's vessel patrol directly rather than anchoring in coral — VHF Channel 16 or the sanctuary's published emergency number.

If you're a commercial or recreational fisherman, most sanctuaries allow fishing — but the exceptions matter and they vary by sanctuary and zone. The Florida Keys sanctuary has ecological reserves and sanctuary preservation areas where all extraction (including fishing) is prohibited; fishing is permitted in the general protected water, regulated by Magnuson-Stevens and Florida state law. Monterey Bay allows fishing with state license; certain areas around submarine canyons restrict gear types that could cause bottom damage. Stellwagen Bank allows fishing but restricts certain gear in areas critical to right whale habitat. The practical step: before fishing in or near a sanctuary, download the boundary maps and zone-specific regulations from sanctuaries.noaa.gov/management/regulations for your specific sanctuary. NOAA and the relevant state fishery managers jointly enforce sanctuary fishing rules — you need to comply with both federal sanctuary regulations and state fishing licenses and bag limits. If you use commercial fishing gear, check whether gear type restrictions (lobster traps, gillnets, trawl gear) apply to any sanctuary zones you transit.

If you live or work in a coastal sanctuary community, the economic stakes are substantial. The Florida Keys National Marine Sanctuary alone generates an estimated $4.4 billion in annual economic activity from diving, snorkeling, fishing, and tourism — all dependent on healthy coral reefs and fisheries that the sanctuary protects. Sanctuary designation provides regulatory certainty for tourism-dependent businesses: it prevents industrial activities (offshore drilling, large-scale aggregate mining, major port development) that could damage the ecosystem that your business depends on. Monterey Bay Sanctuary supports a whale watching, dive tourism, and sportfishing economy estimated at over $1 billion annually. In sanctuary communities, the NOAA sanctuary advisory council is the formal public input mechanism — councils meet quarterly and include representatives from commercial fishing, recreation, conservation, local government, and tourism. Attend meetings and participate in management plan revisions (which occur every 5–10 years) to protect your community's economic interests in sanctuary management decisions.

If you operate a commercial vessel or charter in sanctuary waters, the strict liability provision (16 U.S.C. § 1443) is your most significant legal risk — and it has no negligence threshold. If your vessel grounds on a coral reef, even in an emergency that wasn't your fault, you're liable for the full cost of response (containment, cleanup), restoration (replanting coral, habitat reconstruction), and the value of lost ecological services during the recovery period. Coral restoration typically costs $200–$500 per square foot and can run into millions of dollars for a major grounding. In 2002, a cruise ship grounding on Florida Keys reef incurred restoration liability exceeding $3.6 million. Obtain sufficient liability insurance for sanctuary operations — your marine policy should explicitly cover resource damage liability in marine protected areas, and you should discuss sanctuary-specific exposure with your marine insurance broker. For charter operators, make sure you're current on the sanctuary's No-Take Zones, anchoring restrictions, and permitted fishing areas before taking clients into sanctuary waters — you bear responsibility for client compliance with sanctuary rules.

Sanctuary management plans must be consistent with state coastal zone management programs under the federal consistency provisions of the Coastal Zone Management Act.

State Variations

National marine sanctuaries are federally designated but state waters are involved:

Several sanctuaries include both federal waters (3+ miles offshore) and state waters (0–3 miles), requiring federal-state management coordination
States retain authority over fishing in state waters within sanctuaries
State pollution discharge laws complement federal sanctuary protections
Some states have designated their own marine protected areas adjacent to or overlapping with federal sanctuaries
State governors are consulted during designation and may object (triggering additional review)

Implementing Regulations

15 CFR Part 922 — NOAA National Marine Sanctuary Program regulations covering sanctuary designation, management plans, permit requirements, prohibited activities, and site-specific rules for each designated sanctuary.

Pending Legislation

S 2873 (Sen. Blackburn, R-TN) — Undersea Cable Protection Act: prevent national marine sanctuaries from imposing new permits on already-authorized undersea fiber cables. Status: Introduced.
HRES 822 — Supporting designation of October 23, 2025 as National Marine Sanctuary Day. Status: Introduced.

Recent Developments

NOAA has been expanding the sanctuary system, with new designations and expansions under consideration for the Hudson Canyon (off New York/New Jersey), Chumash Heritage (off central California), and other sites. The Restoring Resilient Reefs Act and related legislation would reauthorize and expand sanctuary programs. Climate change — including ocean warming, acidification, and sea level rise — is altering sanctuary ecosystems and challenging managers to adapt protections to shifting conditions. Coral bleaching events in the Florida Keys and Hawaiian sanctuaries have been particularly severe. Deep-sea sanctuaries protecting submarine canyons and seamounts have expanded understanding of biodiversity in areas previously considered barren.