If your employees work on, near, or over navigable water, even occasionally, your standard workers' compensation policy may not provide full protection. This coverage gap often surprises business owners and can result in unexpected federal consequences when a claim arises.
The relationship between USL&H, OCSLA, MEL, the Jones Act, and the Defense Base Act centers on one key question: where does the work take place? The cost and legal framework for a work injury depend on the location, with each setting subject to different laws and costs. Understanding which coverage applies is essential, as these systems are intentionally distinct and do not allow for gaps.
This guide explains each regime from an employer's perspective, covering their origins, scope, exclusions, benefits, and how to structure a comprehensive maritime insurance program.
| Coverage | What It Is | Who It Covers | Legal Basis | Typical Work Environment |
|---|---|---|---|---|
| USL&H | Federal workers' compensation | Dockworkers, shipbuilders, ship repairers, harbor workers | Longshore and Harbor Workers' Compensation Act (1927) | Harbors, shipyards, docks, terminals |
| OCSLA | Extension of federal law offshore | Offshore oil and gas workers on fixed platforms and subsea structures | Outer Continental Shelf Lands Act | Fixed offshore platforms, subsea infrastructure |
| DBA | Extension of USL&H overseas | Employees of U.S. government contractors abroad | Defense Base Act | Overseas military bases and public works contracts |
| Jones Act | Federal statutory right to sue (not an insurance policy) | Seamen — crew members of vessels in navigation | Merchant Marine Act of 1920 | Vessels in navigation |
| MEL | Employer liability insurance | Maritime workers whose seaman status is in question or who fall outside comp systems | Insurance contract | Offshore contractors, diving companies, marine service firms |
Remember this distinction: USL&H, OCSLA, and DBA are no-fault, scheduled benefit compensation systems that are compulsory for covered employers. The Jones Act is a liability regime, granting employees the right to sue for negligence, with damages determined by juries. MEL is the insurance that addresses this liability. Failing to distinguish these categories can create coverage gaps that lead to costly claims.
Why a Federal Workers' Compensation System Exists at All
State workers' compensation laws are creatures of state power, and early in the twentieth century, the courts held that state comp statutes could not constitutionally reach injuries occurring on navigable waters — that territory belonged to federal admiralty law. The result was a cruel gap: a worker hurt on the pier had a state remedy, while the same worker hurt ten feet away on the deck of a ship had none.
Congress closed that gap in 1927 with the Longshore and Harbor Workers' Compensation Act. In 1972, Congress amended the Act dramatically, extending coverage landward onto piers, terminals, and adjoining waterfront areas, and in 1984, it refined the boundaries again with a set of specific exclusions. The modern Act is the product of all three eras, which is part of why coverage questions can feel counterintuitive — the lines were drawn and redrawn over decades of litigation and amendment.
The Act is administered federally through the U.S. Department of Labor's Office of Workers' Compensation Programs, not through your state workers' comp board. The claims process, benefit schedule, dispute resolution system, and penalties all operate under a federal framework that operates independently of your state system. If an employer is subject to USL&H, a state workers' comp policy alone is not sufficient — the exposure cannot be opted out of, waived, or wished away.
USL&H: The Two-Part Coverage Test
Whether a worker falls under the Longshore Act comes down to two questions: the courts and the industry call them status and situs. Both must be satisfied.
Status asks what the employee does. The Act covers workers engaged in maritime employment: longshore workers loading and unloading ships, ship repairers maintaining and fixing vessels, shipbuilders and shipbreakers constructing or dismantling them, harbor construction workers building and maintaining docks, piers, and terminals, and marine construction workers on bulkheads, seawalls, and — increasingly relevant — offshore wind projects. Oil and gas workers on structures that are not considered vessels can also qualify. Maritime employment is interpreted broadly and functionally: a worker doesn't need a maritime job title or to spend the majority of their time on maritime tasks. Courts have generally held that if some portion of a worker's duties involves maritime employment, the status test can be met — coverage attaches to the employment as a whole rather than flickering on and off task by task.
Situs asks where the work happens. Covered locations include the navigable waters of the United States and the adjoining areas the 1972 amendments added: any pier, wharf, dry dock, terminal, building way, marine railway, or other adjoining area customarily used by an employer for loading, unloading, repairing, dismantling, or building a vessel. The phrase "adjoining area customarily used" has generated decades of case law, and the practical takeaway is that situs extends well past the water's edge. A warehouse or yard in a port complex can qualify. Geography that appears to be ordinary industrial real estate on a map can be Longshore situs in the Department of Labor's eyes.
And this is not an either/or system in many states. Under the concurrent jurisdiction doctrine confirmed by the Supreme Court in the Sun Ship decision, a worker in the overlapping zone may pursue benefits under both the state act and the federal act, with credits applied so there's no double recovery. For the employer, a single injury can put both policies — and both regulatory systems — in play at once.
Who USL&H Excludes
The 1984 amendments carved out several categories of workers who would otherwise arguably meet the status and situs tests, and understanding the exclusions is just as important as understanding the coverage, because most of them come with a condition employers routinely miss.
The Act excludes individuals employed exclusively to perform office clerical, secretarial, security, or data processing work. It excludes employees of clubs, camps, recreational operations, restaurants, museums, and retail outlets. It excludes marina employees who are not engaged in the construction, replacement, or expansion of the marina. It excludes certain employees of suppliers, transporters, and vendors who are temporarily at a covered situs and are not performing work normally performed by the facility's own employees. It excludes aquaculture workers and individuals employed to build, repair, or dismantle recreational vessels under a specified length.
Here is the trap: most of these exclusions apply only if the individual is covered under a state workers' compensation law. If your state policy doesn't respond — because of a classification issue, a jurisdictional gap, or a lapse — the exclusion can evaporate, and the worker lands back under the federal Act. The exclusions are conditional, not absolute.
Separately, the Act has always excluded a master or member of a crew of a vessel — seamen, because they have their own remedy under the Jones Act. It also excludes persons engaged by a master to load, unload, or repair small vessels under eighteen tons net.
What USL&H Pays
Longshore is a no-fault benefits system like state comp, but the numbers run meaningfully higher in most states. The Act provides all reasonable and necessary medical care for work-related injuries, with the employee's initial choice of physician. Temporary total disability pays 66⅔ percent of the worker's average weekly wage during recovery, subject to a maximum tied to the national average weekly wage, which adjusts annually and typically exceeds many state maximums. Permanent partial and permanent total disability benefits compensate long-term impairments, including a schedule of awards for specified losses. Vocational rehabilitation is available when the injured worker can no longer perform their job. Death benefits flow to the surviving spouse and dependents, along with funeral and burial expenses. Settlements are possible but require approval by the Department of Labor under the Act's settlement provisions.
For employers, the impact is twofold. Longshore claims are typically more expensive than state claims due to higher wage bases, higher maximums, and a claimant-friendly process. Premiums reflect this, as Longshore-rated payroll is significantly more costly than state-act payroll. Accurate classification and payroll allocation at policy inception are essential.
Longshore and Your Experience Mod
Many buyers are surprised to learn that Longshore exposure affects your experience rating. Payroll and losses under federal classifications are included in your experience rating, and a significant Longshore claim can impact your workers' compensation costs for years. This applies in California as well. Treating USL&H as separate from your main program can lead to unexpected costs.
OCSLA: Federal Coverage Beyond State Waters
The Outer Continental Shelf Lands Act extends U.S. law — including federal workers' compensation benefits — to employees working on the outer continental shelf, the zone of submerged lands beyond state waters. In practice, OCSLA applies USL&H benefits to the offshore energy workforce engaged in exploration, drilling, and production who are not crew members of vessels.
The roster of employers who need OCSLA coverage reads like a directory of the offshore energy supply chain: oil and gas operators running exploration and production; drilling contractors with employees on fixed offshore platforms; service contractors providing maintenance, construction, and support; pipeline operators engaged in offshore construction and repair; and subsea engineering and diving companies installing and maintaining underwater infrastructure.
Three principles govern. OCSLA places offshore operations under federal jurisdiction, not state law. It extends USL&H-equivalent benefits offshore, so the benefit structure described above follows the worker onto the shelf. And it does not apply to Jones Act seamen — the platform worker and the crew boat deckhand standing next to each other at the dock are headed into two entirely different legal systems, which is why offshore energy generates so many of the classification fights described below. Workers rotating across fixed platforms, jack-ups, and vessel assignments present genuinely hard calls, and getting them wrong is expensive in both directions.
The Defense Base Act: Longshore Goes Overseas
The Defense Base Act applies the Longshore framework to employees of U.S. government contractors working outside the United States — construction, security, logistics, and services on military bases and under public works and defense contracts abroad. If your company takes on federal contract work overseas, DBA coverage is generally both a statutory requirement and a contractual one, written as its own placement.
Several features of DBA deserve an employer's attention. Coverage applies to employees regardless of nationality — U.S. citizens, local nationals, and third-country nationals hired under a covered contract are all in. The courts have applied a "zone of special danger" doctrine to overseas work, under which injuries can be compensable even outside ordinary working hours when they arise from the conditions of overseas employment — a materially broader compensability standard than domestic employers are used to. Prime contractors face the same flow-down problem discussed later in this guide: an uninsured subcontractor's DBA obligation can climb the contracting chain. And for injuries arising from war-risk hazards, the War Hazards Compensation Act operates alongside DBA, providing a federal reimbursement mechanism for certain claims — a structural detail that matters to carriers and pricing in conflict zones.
The key point: DBA coverage is not unusual. It uses the same Longshore framework, applied overseas, and should be considered for any contract involving federal work abroad.
The Seaman Question: The Jones Act
Everything above concerns compensation systems. Crew members of vessels — seamen — live in a different legal universe entirely.
The Jones Act, formally the Merchant Marine Act of 1920, is not an insurance policy. It is a federal statute that grants an injured seaman the right to sue the employer for negligence, with damages that can include lost wages, medical expenses, and pain and suffering. The statute itself, 46 U.S. Code § 30104, puts it plainly: "A seaman injured in the course of employment or, if the seaman dies from the injury, the personal representative of the seaman may elect to bring a civil action at law, with the right of trial by jury, against the employer." General maritime law adds claims for unseaworthiness and the ancient no-fault remedy of maintenance and cure. These are lawsuits, not scheduled benefits: there is no statutory cap, juries decide damages, and verdicts in serious injury cases can be enormous. Merely appearing and mounting a defense in federal court can cost an employer $200,000 or more before any verdict is reached, which is precisely why the insurance response to this exposure is critical.
Who qualifies as a seaman? The Supreme Court's Chandris framework asks whether the worker contributes to the function of a vessel (or an identifiable fleet of vessels) and whether the worker's connection to the vessel is substantial in both duration and nature. The widely cited rule of thumb is that a worker who spends at least thirty percent of their time in the service of a vessel in navigation may qualify as a seaman — but it is a guideline, not a bright line, and the fights happen at the margins. Typical seamen include crew members, captains, and workers essential to the vessel's mission.
And what counts as a vessel? Broadly more than you'd think. The Supreme Court has held that a vessel includes practically any watercraft used, or capable of being used, as a means of transportation on water — a definition that swept in a massive dredge in the Stewart case — though the Court later trimmed the edges in Lozman, holding that a floating home no reasonable observer would consider designed to carry people or things over water is not a vessel. Between those poles sit barges, work platforms, jack-up rigs, and all manner of floating equipment that generate genuine classification disputes.
Employers typically address Jones Act exposure with Protection and Indemnity insurance, which covers vessel owner liability including crew liability, or, for non-owners, with Maritime Employers Liability.
MEL: The Insurance That Answers the Jones Act
Marine Employers' Liability and the Jones Act are closely related and often used interchangeably in conversation, but they are not the same thing, and the distinction is the foundation of a sound program. The Jones Act is the law that creates the exposure; MEL is the insurance policy that responds to it. One is a statutory right the worker holds; the other is a contract the employer buys.
MEL exists for employers whose people work in a maritime environment — offshore contractors, diving companies, marine service firms — where a worker may claim seaman status, or where employees fall into the gray zone between compensation systems. A Jones Act claim is handled as a lawsuit against the employer; a MEL claim is handled as an insurance claim under the policy purchased to stand behind exactly that lawsuit.
The trigger language is where MEL programs quietly fail. A hard trigger form pays only if the injured worker is actually determined to be a Jones Act seaman. That determination can take years of litigation, and if the court ultimately decides the worker was not a seaman, a hard-trigger policy can walk away — after you've funded a defense against a theory the policy was supposedly bought for, and just as the claim transforms into a Longshore or state comp matter that a different policy must absorb. A soft trigger form responds more broadly to claims arising out of employees working on or around vessels, regardless of how the seaman-status question ultimately resolves. It's built for exactly the gray-area worker whose status nobody can predict in advance.
Policy limits require careful review. Since Jones Act recoveries are uncapped, MEL limits that seem adequate may be insufficient for severe vessel injuries. Umbrella and excess policies do not automatically extend over MEL unless specifically arranged.
How the Policies Divide the Work: Payment, Defense, and What's Compulsory
A well-structured program allocates responsibilities clearly. The workers' compensation policy, endorsed for USL&H and OCSLA if needed, pays valid federal compensation claims. The MEL policy covers valid MEL claims and typically provides defense for maritime claims, including OCSLA and USL&H theories. Payment and defense must be coordinated to avoid coverage gaps.
It is important to distinguish between compulsory and voluntary coverage. USL&H and OCSLA insurance are legally required for covered employers. MEL insurance is not mandatory, but Jones Act liability still applies regardless of insurance. Confusing these requirements can result in self-insuring costly jury verdicts. The underlying problem is worth stating plainly: the same gray-area worker — the technician who splits time between the shop, the dock, and the boat — can plausibly plead state comp, Longshore, and Jones Act theories all at once, and their attorney will. A program assembled from a state-act policy here, a hard-trigger MEL form there, and an assumption that the vessel owner's P&I will handle the rest is a program in which every policy can point at the others while the status fight plays out — with the employer funding the gap.
Additionally, a Longshore-covered worker who cannot sue the employer may still sue a vessel for negligence under section 905(b) of the Act. If your company owns or operates the vessel, this third-party exposure is significant, underscoring the need for P&I coverage rather than relying solely on workers' compensation.
The Cost of Being Uninsured: Why These Gaps Have Teeth
Operating with unrecognized Longshore exposure is not like an ordinary insurance miss. The Act requires covered employers to secure coverage, and failure to do so carries consequences on three fronts.
First, direct penalties: failure to secure payment of compensation is punishable by fines and potential imprisonment, and where the employer is a corporation, the Act makes the president, secretary, and treasurer personally liable — severally as well as jointly with the corporation — for benefits owed. The corporate shield business owners rely on for most liabilities does not protect officers here.
Second, an injured employee of an uninsured employer gains an election the Act otherwise takes away: the right to sue the employer in tort. And the Act strips the uninsured employer of the classic common-law defenses — contributory negligence, assumption of risk, and the fellow-servant rule cannot be pleaded. You face a negligence suit with your best defenses removed by statute.
Third, your state workers' comp policy generally won't respond to a federal claim, as it wasn't written and priced to cover it. The standard workers' compensation policy form treats Longshore as a distinct obligation that must be added by endorsement. Without the endorsement, the claim is yours.
How the Coverage Actually Gets Written
Longshore coverage is added to a workers' compensation policy via the USL&H endorsement, with appropriate federal classifications and payroll declared. OCSLA and DBA exposures require their own endorsements. Employers with ongoing exposure should ensure accurate classifications, proper payroll allocation, and select a carrier experienced with maritime risks, as not all carriers accept waterfront exposures.
For employers with incidental or uncertain exposure, brokers may arrange an "if any" placement, attaching the endorsement with minimal payroll. This approach can provide coverage for unexpected claims if used appropriately. However, using it to avoid premiums for known exposures can lead to disputes. Not all carriers accept this structure, so it is important to work with a broker experienced in maritime risks.
Contractors, Subcontractors, and the Flow-Down Problem
The Longshore Act contains a provision that should make every general contractor on waterfront work sit up: if a subcontractor fails to secure required coverage, the contractor above it can be held liable for securing compensation for the subcontractor's employees. The Defense Base Act carries the same logic overseas. In practice, your subcontractors' insurance hygiene becomes your balance-sheet problem.
Diligence in contract management is essential. Contracts for waterfront, offshore, or overseas work should specifically require USL&H, OCSLA, DBA, and, where applicable, MEL coverage — not just "statutory workers' compensation." Collect and review certificates carefully, as standard workers' comp certificates may not indicate federal coverage. Ensure this review extends through all subcontractor tiers, as liability can flow up the contracting chain.
The Businesses That Get Caught Off Guard
Terminal operators and shipyards are aware of Longshore requirements, but employers at the margins are often caught off guard. This includes contractors working temporarily on piers, electricians or technicians working over water, logistics companies in port complexes, and firms bidding on offshore projects. Many do not consider themselves maritime businesses, but the Department of Labor focuses on whether any employee could be injured performing maritime work at a covered location.
Next Steps
Begin with a thorough exposure review. Identify all locations where employees may work throughout the policy year, not just their usual sites. Review contracts to determine if work will occur on piers, terminals, vessels, over water, offshore, or abroad. Consider whether subcontractors or employees may board vessels for any reason.
Have your insurance program reviewed by a maritime risk specialist. Confirm that the USL&H endorsement is included and that classifications and payroll are accurate. Determine if OCSLA or DBA applies to any contracts. Review MEL trigger language and clarify defense responsibilities for mixed-theory claims. Ensure coordination among workers' comp, MEL, and P&I coverage. Understand the impact of federal claims on your experience mod. Addressing these questions proactively can prevent costly gaps.
Credit where it's due: organizations like the International Institute of Marine Insurance Studies (IIMIS) have done valuable work educating brokers and employers about Longshore exposure, and their materials are worth knowing about for anyone who wants to go deeper into this corner of the market.
At Falcon West Energy, we specialize in marine and energy risk, including Longshore, OCSLA, Defense Base Act, Jones Act, MEL, and related coverage structures. If your business has any waterfront, offshore, or overseas exposure, a brief consultation now can help you avoid costly federal claims later.
This article is for general information and isn't legal or coverage advice. Every operation is different — talk with a qualified broker about your specific exposure.
