Does general liability cover mold after a leak?

Often it is excluded or limited. Ask how the policy treats mold after a water loss and whether a sublimit applies.

Is the L&I registration bond the same as insurance?

No. The bond satisfies a registration requirement; the general liability policy is separate insurance, and L&I asks for proof of each.

Does a general contractor's insurance cover my work as a subcontractor?

Not usually. A general contractor's policy is written for the general contractor. Its subcontract will typically require you to carry your own general liability and to add the GC as an additional insured.

What is stop-gap coverage?

Stop-gap is employer's liability coverage, for claims that fall outside the L&I policy. The state fund does not provide it, so employers buy it separately, often as an endorsement.

Business · By industry · Plumbing contractors

Plumbing contractor insurance in Washington

For plumbing contractors in Washington, from a service-and-repair van to crews roughing in new buildings. The insurance questions follow the work: a fitting that fails behind a finished wall, the subcontract a general contractor requires, the tools and fixtures in the truck, the people doing the work. No single policy covers all of them; these are the areas to review.

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Who this page is for

Service and repair plumbers working from vans
Residential and commercial plumbing contractors on new construction and remodels
Contractors whose work includes pipe insulation or water treatment lines

What to review

The questions that matter

General liability, certificates and the subcontract

Property managers and general contractors tend to ask for a certificate of insurance before a plumber starts, and the subcontract or service agreement behind the request is where the real terms live. General liability responds to claims that your work injured someone or damaged property that is not yours. Before signing, look for the clauses that change what the policy must do: the GC or owner added as an additional insured, primary and non-contributory wording, a waiver of subrogation, and limits higher than you carry. None of these happens by itself; each is a question for the policy.

Water damage and work behind the wall

A plumber's largest liability question is water. A fitting that fails behind a finished wall can damage flooring, cabinets, drywall and the unit below, and the claim may arrive long after the job closed. That is the products-completed operations part of general liability: ask whether it is included, what its aggregate limit is, how the policy treats the part of the building you worked on, and whether mold after a leak is excluded or sublimited.

Drain machines, threaders and fixtures in the truck

A plumber's inventory moves: drain machines, pipe threaders, press tools and the fixtures and water heaters bought for next week's jobs. A property policy tied to the shop address may not reach any of it once it leaves. Inland marine coverage, commonly sold as a tools and equipment floater, is built for items that work out of a truck, sit on a job or wait in storage. A water heater delivered to a site but not yet set may need an installation floater. Ask how the policy values each item and whether theft from a vehicle is covered.

Trucks, vans and employees' own cars

Commercial auto covers the vehicles the business owns, and each truck and van should be scheduled on it. Employees who take their own cars to a job or a supply house raise a different question, hired and non-owned auto, because a crash in that car can still produce a claim against the business. That coverage protects the business's liability only; the employee's car is the employee's own concern. Tools and fixtures stolen from a parked truck can fall under the auto policy or the equipment floater depending on the wording, so ask which before a loss, not after.

Workers' compensation through L&I

Workers' compensation in Washington is written mostly by the state. The Department of Labor & Industries is the insurer for most employers, with private carriers largely out of the picture. For each employer L&I assigns one or more risk classifications based on the nature of the work, gives each its own base rate, and applies the employer's experience factor to arrive at the rate paid. L&I's classification plan places plumbing in classification 0306, with pipe insulation and water treatment lines as subcodes; confirm your own assignment with L&I, because the assignment follows the work performed, not the trade name. The L&I policy does not include employer's liability; that coverage, called stop-gap, is bought separately.

What Washington asks of plumbing contractors

Plumbing is a licensed trade in Washington. L&I certifies plumbers individually and says only L&I-certified plumbers can legally perform plumbing work on someone else's property. It also describes a plumbing contractor license under chapter 18.106 RCW, which carries its own bond, its own insurance requirement and a designated certified plumber for the company. Separately, Washington requires construction contractors to register with L&I, which involves a surety bond, $30,000 for a general contractor and $15,000 for a specialty contractor at the amounts in effect since July 1, 2024, plus proof of general liability insurance with L&I as certificate holder. A bond under either chapter is not insurance and does not replace a liability policy.

Umbrella and higher limits

When a contract asks for limits the primary policies do not carry, which larger general contractors and public owners commonly do, a commercial umbrella supplies the difference. It is written over general liability, commercial auto and employer's liability and pays above their limits. Read it with the underlying policies beside it: it adds nothing to a policy it does not list, it may follow the primary terms or carry its own exclusions, and it may or may not extend over stop-gap. Settle each of those before a general contractor's certificate request arrives, not after.

Illustrative example

a supply line that fails in a condominium

A contractor remodels a bathroom in a third-floor condominium. Eight months later a supply fitting fails overnight and water runs through two units below; the association's insurer and the downstairs owners pursue the plumber. Whether the policy responds depends on whether completed operations coverage was in place, which policy year the claim belongs to, the limits, any exclusion for the part of the building worked on, and how mold that follows the leak is treated. A real claim depends on the facts and the policy.

What to prepare

The mix of work: service and repair, remodels, new construction
Your L&I registration, plumbing contractor license, designated certified plumber and assigned risk classification
The insurance clauses in the subcontracts and service agreements you sign most often
A list of trucks and vans, who drives each, and whether anyone uses a personal car for work
An inventory of tools, equipment and stocked fixtures with rough values
Headcount, L&I hours by type of work, current policies and any claims in recent years

Request a plumbing contractor insurance review

Questions people ask

Quick answers

Often it is excluded or limited. Ask how the policy treats mold after a water loss and whether a sublimit applies.
No. The bond satisfies a registration requirement; the general liability policy is separate insurance, and L&I asks for proof of each.
Not usually. A general contractor's policy is written for the general contractor. Its subcontract will typically require you to carry your own general liability and to add the GC as an additional insured.
Stop-gap is employer's liability coverage, for claims that fall outside the L&I policy. The state fund does not provide it, so employers buy it separately, often as an endorsement.

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