SB221 amends two federal statutes—the Tariff Act of 1930 and the Anti‑Smuggling Act—to redefine ‘‘customs waters’’ so that U.S. customs enforcement reaches to the outer limits of the contiguous zone (up to 24 nautical miles from baseline), rather than the older ‘‘four leagues’’/12‑mile understanding in those statutes. The bill explicitly ties the statutory definition to baselines determined under international law and references Presidential Proclamations 5928 and 7219.
This is a targeted, technical change with practical consequences: it gives U.S. Customs and Border Protection (CBP) clearer statutory authority to operate farther offshore for customs, immigration, and public‑health enforcement and updates language used in key enforcement statutes. That outward shift raises operational, interagency, and international coordination questions that compliance officers, maritime operators, and foreign affairs advisors will need to account for.
At a Glance
What It Does
The bill replaces outdated wording in 19 U.S.C. 1401(j) and 19 U.S.C. 1709(c) so that ‘‘customs waters’’ cover both the U.S. territorial sea (to the limits permitted by international law) and the contiguous zone (to the limits permitted by international law, i.e., up to 24 nm). It takes effect the day after enactment.
Who It Affects
Primary actors affected include U.S. Customs and Border Protection, Department of Homeland Security components engaged in maritime interdiction, federal prosecutors handling maritime violations, and commercial vessels (U.S. and foreign) that operate near U.S. coasts. Coastal state law enforcement and public‑health agencies will also see downstream effects.
Why It Matters
The change converts an executive proclamation-based practice into explicit statutory language for customs enforcement reach, reducing legal gaps that complicate interdictions and prosecutions while increasing the legal footprint of U.S. authorities over activities occurring in the contiguous zone.
More articles like this one.
A weekly email with all the latest developments on this topic.
What This Bill Actually Does
SB221 is a narrow, text‑level fix to two enforcement statutes that refer to the geographic reach where U.S. customs law applies at sea. The bill rewrites the statutory phrase that previously referenced ‘‘the waters within four leagues of the coast’’ so that the phrase now points to the territorial sea and the contiguous zone as measured from baselines under international law.
Practically, that aligns the statutes with long-standing Presidential proclamations and with customary rules reflected in the Law of the Sea about a coastal State’s adjacent enforcement areas.
The bill does not alter the extent of the territorial sea beyond what international law permits; instead, it allows statutory enforcement authority to extend to the contiguous zone (commonly 24 nm) where a State may act to prevent and punish infringements of its customs, fiscal, immigration, and sanitary laws. For enforcement officers this means a clearer, statutory basis to board, inspect, or interdict vessels in that band, subject to the legal standards applicable in the contiguous zone (for example, the need for reasonable grounds that a violation affecting those interests has occurred or will occur).Mechanically, SB221 amends two specific U.S. Code provisions—one in the Tariff Act and one in the Anti‑Smuggling Act—and sets the effective date to the day after the bill becomes law.
The bill’s findings and sense of Congress spell out the policy rationale: improved vessel speed and technology have reduced the practical window for interdiction within the old 12‑mile frame, and extending customs waters is presented as necessary to protect law enforcement and public health objectives.On the ground, the statute will require operational updates rather than creating entirely new powers: agencies will need new guidance about rules of engagement, standards for boarding and hot pursuit when acting in the contiguous zone, and coordination with State and local maritime authorities. The change can also trigger regulatory updates and interagency memoranda to align practice with the amended statutory text and to minimize the risk of cross‑border incidents or litigation alleging overreach.
The Five Things You Need to Know
The bill amends 19 U.S.C. 1401(j) (Tariff Act of 1930) to replace the ‘‘four leagues’’ language with a definition pointing to the territorial sea and the contiguous zone measured from baselines under international law.
It amends 19 U.S.C. 1709(c) (Anti‑Smuggling Act) with parallel wording, bringing both customs and anti‑smuggling statutory definitions into alignment.
SB221 references Presidential Proclamations 5928 (1988) and 7219 (1999) as the historical basis for the territorial sea and contiguous zone limits it adopts in statute.
The bill’s findings assert that modern vessel performance and technology make the prior 12‑nautical‑mile limit insufficient for timely interdiction—this is the policy justification Congress records.
The statutory amendments take effect the day after enactment, immediately changing the geographic reach of the listed enforcement statutes without a phased implementation period.
Section-by-Section Breakdown
Every bill we cover gets an analysis of its key sections.
Short title
Provides the Act’s official short name, the "Extending Limits of United States Customs Waters Act of 2025." This is purely nominal but signals congressional intent to treat the measure as a distinct policy change rather than a minor technical amendment.
Findings and sense of Congress
Lays out factual predicates: recalls Presidential Proclamations 5928 and 7219, summarizes customary international law norms about territorial seas and contiguous zones, and records Congress’s view that a 12‑mile limit is insufficient for modern interdiction and public health protection. These findings do not create legal obligations but frame congressional intent, which courts and agencies may consider when interpreting the amendments.
Amendment to the Tariff Act of 1930 (19 U.S.C. 1401(j))
Rewrites the definition of ‘‘customs waters’’ in 19 U.S.C. 1401(j) by adding numbered subparagraphs and replacing geographic phrasing with references to the territorial sea and the contiguous zone measured from baselines in accordance with international law. Practically, this makes actions taken by CBP in the contiguous zone fall squarely within the statute’s geographic scope, which matters for enforcement authorities that depend on that statutory definition for jurisdictional and evidentiary purposes.
Amendment to the Anti‑Smuggling Act (19 U.S.C. 1709(c))
Applies substantially the same textual change to the Anti‑Smuggling Act, again replacing older phrasing with explicit reference to the territorial sea and contiguous zone. Aligning both statutes reduces inconsistency across statutes that govern seizures, inspections, and prosecutions for customs‑related offenses at sea.
Effective date
States that the amendments take effect the day after enactment. That immediate effect means agencies and affected parties will need to act quickly to update operational guidance, training, and any interagency agreements that reference the prior statutory language.
This bill is one of many.
Codify tracks hundreds of bills on Government across all five countries.
Explore Government in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- U.S. Customs and Border Protection — gains a clearer, statutory basis to conduct customs, immigration, and sanitary enforcement activities in the contiguous zone, reducing reliance on executive proclamations and potentially easing evidentiary and jurisdictional questions in prosecutions.
- Federal prosecutors and DHS law enforcement components — benefit from improved jurisdictional clarity when seeking seizures, arrests, or prosecutions tied to activities that occur beyond 12 nm but inside 24 nm.
- Coastal public health and immigration authorities — may secure more time and space to interdict vessels suspected of introducing contraband, infectious diseases, or unauthorized migrants before they reach shore.
- Maritime compliance departments of commercial shipping and fishing firms — gain clearer boundaries for where enhanced inspections or interdictions by U.S. authorities may occur, allowing them to update compliance protocols and training.
Who Bears the Cost
- Commercial and foreign‑flag vessels operating near U.S. coasts — face longer potential exposure to U.S. inspections, detentions, or searches in the contiguous zone, which could increase delays and operational costs.
- Department of Homeland Security and CBP — will likely face increased operational expenses (patrols, training, legal support) to exercise extended enforcement reach, without funding provided in the bill.
- Foreign governments and maritime operators — may incur diplomatic and legal costs responding to more frequent U.S. enforcement actions farther offshore, potentially straining bilateral maritime cooperation in some regions.
- Federal courts and defenders — may see increased litigation and challenges over the scope of boarding, hot pursuit, and the evidentiary sufficiency for actions taken in the contiguous zone, adding caseload and complexity.
Key Issues
The Core Tension
The central dilemma SB221 poses is balancing the tactical benefits of pushing customs enforcement outward—giving U.S. authorities more time and space to interdict fast or evasive vessels—against the obligation to preserve other States’ navigation and sovereign rights under international law and avoid overreach that produces diplomatic incidents, litigation, or excessive operational burdens on U.S. agencies.
SB221 is deliberately focused on statutory language rather than creating novel substantive powers; nevertheless, it raises a set of practical and legal questions. First, the contiguous zone permits limited enforcement tied to preventing or punishing infringement of customs, fiscal, immigration, and sanitary laws—U.S. authorities must still meet international standards (for example, reasonable grounds) before boarding or restraining vessels outside the territorial sea.
That means agencies will need operational rules that squarely track international law thresholds so interdictions withstand judicial and diplomatic scrutiny.
Second, the bill relies on baselines ‘‘determined in accordance with international law’’ but does not specify how or where baseline determinations will be published or updated; disputes over baseline configurations (straight baselines, low‑tide elevations, etc.) can create uncertainty about exactly where the amended statutes apply. Third, the statute increases exposure to cross‑border incidents: hot pursuit rules and the distinction between contiguous zone authority and territorial jurisdiction are technical and fact‑sensitive, so missteps can create international friction or liability.
Finally, SB221 contains no funding or operational directives; extending the statutory reach without appropriations or clarified interagency responsibilities could produce implementation gaps during the transition.
Try it yourself.
Ask a question in plain English, or pick a topic below. Results in seconds.