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USL&H Insurance: The Federal Requirement for Work Over Water

Most waterfront property owners have never heard of it until something goes wrong. It is the single most useful question you can ask a marine contractor bidding your job.

If you are hiring someone to build or repair a structure over the water, there is one question worth asking before price, schedule or materials come up at all: do you carry USL&H?

Most owners have never heard of it. It is the reason an injury on your dock can become your problem.

What USL&H is

USL&H — United States Longshore and Harbor — is insurance written under the Longshore and Harbor Workers’ Compensation Act, a federal statute at 33 U.S.C. §901 and following, administered by the U.S. Department of Labor’s Office of Workers’ Compensation Programs.

It is a federally mandated requirement for employers whose workers engage in maritime-adjacent employment that falls outside traditional state workers’ compensation. That sentence is doing a lot of work, so it is worth taking apart.

The gap it exists to fill

Ordinary workers’ compensation is a creature of state law. Every state runs its own scheme, and those schemes were written with land-based employment in mind.

Maritime work does not sit neatly inside that. A worker driving piles from a barge, repairing a wall from the water side, or building a dock out over a river is doing something state schemes were not designed around — and federal law has long treated navigable waters as its own jurisdiction. So Congress built a separate federal scheme for those workers.

The result is two systems with a boundary running roughly along the water’s edge. A worker is meant to fall under one or the other. The danger is a contractor who has only arranged for one of them while doing work that crosses the line.

Who the Act covers

Coverage under the Longshore Act turns on two tests, and both have to be satisfied.

Status — what the work is. The employee must be engaged in maritime employment. The Act names longshore workers, ship repairers, shipbuilders and shipbreakers, and it reaches harbour construction workers.

Situs — where the work happens. The injury must occur on the navigable waters of the United States, which for this purpose includes adjoining piers, wharves, dry docks, terminals, building ways, marine railways and other adjoining areas customarily used in loading, unloading, repairing, dismantling or building a vessel.

Both tests, not either. A worker can be doing unmistakably maritime work in a place the Act does not reach, or be standing somewhere it does while doing something it does not cover.

Who it does not cover

The Act specifically excludes masters and members of the crew of a vessel — seamen, who fall under the Jones Act instead. Several other categories are excluded as well, though in general those exclusions only apply where the worker is covered by a state workers’ compensation law — which is the drafting that keeps the gap closed.

What it provides

Where the Act applies, an injured worker is entitled to medical treatment for the injury, disability compensation calculated as a proportion of their average weekly wage and subject to statutory maximums and minimums that adjust annually, vocational rehabilitation where appropriate, and death benefits for survivors.

Employers must secure that liability either through a carrier authorised by the Department of Labor or by being authorised to self-insure. This is not optional. An employer who fails to secure coverage commits a criminal offence, corporate officers may be held personally liable, and an employee injured while the employer was uninsured can bring suit at law — in which the employer loses the common-law defences that workers’ compensation would ordinarily have given it.

Why this matters when you are hiring

Here is the practical shape of the problem.

A marine contractor whose crew works over water needs both state workers’ compensation and USL&H, because the crew crosses that boundary during a normal working day — loading on the bank, working from a barge, finishing at the wall. Carrying only state coverage leaves a hole over exactly the part of the job that is most exposed.

If a worker is injured in that hole, there is no insurance scheme standing behind the claim. What happens next depends on the facts, but an uninsured injury looks for a solvent party, and the owner of the property where the work was happening is a visible one.

USL&H costs money. That is the honest reason some marine bidders do not carry it, and the reason a quote from a contractor who does can look higher than one from a contractor who does not. You are not comparing like with like.

What to ask for

  1. A certificate of insurance showing USL&H named separately from workers’ compensation. They are two lines, not one.
  2. Sent by the broker, not forwarded by the contractor.
  3. Current dates. A certificate that expired in the middle of your project is a certificate for somebody else’s project.
  4. If the work is commercial, municipal or military, confirm what the contract documents require — public and institutional owners routinely require USL&H by name, and for good reason.

No legitimate marine contractor will be put out by any of this. It is a normal part of qualifying a bidder, and the ones who carry the coverage are generally pleased to be asked.

Where Barefoot stands

Barefoot Marine Construction carries Workers’ Compensation and USL&H, and is a Florida Certified General Contractor, #1533461. We will send a current certificate on request, for a residential dock repair as readily as for a commercial contract.

If you are collecting estimates for waterfront work, see also our notes on what drives the cost of a bulkhead, what to ask about permits and the difference between a bulkhead and a seawall.


This page is general information about a federal insurance requirement, written for property owners hiring marine contractors. It is not legal or insurance advice, and it does not attempt to describe how the Act applies to any particular worker or job. The Act, its administration and the benefit figures under it change over time. Confirm current requirements with the U.S. Department of Labor’s Division of Longshore and Harbor Workers’ Compensation, and take advice from your own counsel or insurance broker on anything that turns on your own circumstances.

Frequently asked questions

What does USL&H stand for?
United States Longshore and Harbor. It is shorthand, used across the insurance industry, for coverage written under the Longshore and Harbor Workers' Compensation Act — 33 U.S.C. §901 and following. The Act itself does not carry 'United States' in its name; the abbreviation does, and both refer to the same federal law.
Is USL&H actually required, or is it optional extra cover?
It is federally mandated, not optional. Where the Act applies, the employer must secure coverage either through an insurance carrier authorised by the U.S. Department of Labor or by qualifying as a self-insurer. An employer who fails to secure it faces criminal penalties, corporate officers can be held personally liable, and an injured employee may sue the employer at law with the usual common-law defences stripped away. Coverage requirements and the way the Act is applied change over time — confirm current requirements with the Department of Labor.
Doesn't ordinary workers' compensation already cover this?
Not over navigable water. State workers' compensation and federal USL&H are two separate schemes covering two separate groups of workers, and the boundary between them is roughly the water's edge. A contractor carrying only state coverage has employees who may fall outside both if they are hurt on a barge, on a dock being built over the water, or working from the water side of a wall.
How do I check whether a contractor actually carries it?
Ask for a certificate of insurance and look for USL&H named on it, not just workers' compensation. The two appear separately. Ask for the certificate to be sent by the broker rather than the contractor, and check it is current. This is a normal request and no legitimate marine contractor will be surprised by it.
Is this the same thing as the Jones Act?
No, and the distinction matters. The Jones Act covers seamen — masters and members of the crew of a vessel — who are specifically excluded from the Longshore Act. USL&H covers maritime workers who are not crew: dock builders, ship repairers, harbour construction workers. A marine construction crew generally falls under the Longshore Act rather than the Jones Act, but which applies to a given worker turns on the facts of their employment.
What happens to me, as the property owner, if a contractor is not covered?
An injury with no insurance behind it looks for somewhere to land, and a property owner is a visible target. That is the practical risk. What follows from it depends on the circumstances and on law we are not qualified to advise you on — which is rather the point of checking the certificate before work starts rather than afterwards.

Published November 10, 2026 · Last reviewed November 2026 by Barefoot Marine Construction. Agency requirements change — confirm current requirements with the reviewing agency before planning work.

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Certified General Contractor #1533461 · Workers' Comp + USL&H Insured · Serving Northeast Florida since 2009