General Liability & Umbrella Insurance: FAQs for California plumbers

Only if your license is held by a limited liability company. California does not require a sole proprietor, partnership or corporation to carry general liability insurance as a condition of holding a CSLB license. For those licensees, general liability is driven by customers, general contractors, property managers and the contracts you sign, not by the license.

For an LLC licensee, Business and Professions Code §7071.19 requires general liability insurance with a cumulative limit of at least $1,000,000 if the LLC has five or fewer personnel of record, plus $100,000 for each additional person of record, and the requirement does not go above $5,000,000. The policy must be written by a California-licensed insurer or an eligible surplus lines insurer. An LLC also files a separate $100,000 surety bond for the benefit of its employees and workers (B&P §7071.6.5), on top of the $25,000 contractor's bond every licensee carries.

Two practical points. First, the LLC limit is tied to the number of people listed on the license, so re-check the required limit whenever you add members or officers. Second, the CSLB minimum is a floor, not a recommendation: general contractors and commercial property owners commonly ask every plumbing subcontractor, LLC or not, for at least $1,000,000 per occurrence by contract.

If you are not an LLC and sign no contracts that require coverage, nothing in California law compels you to buy general liability. One failed supply line in an occupied home is the reason most working plumbers carry it anyway.

Subcontract agreements commonly ask a plumbing subcontractor for $1,000,000 per occurrence and $2,000,000 general aggregate, with the products-completed operations aggregate also at $2,000,000. Larger commercial, public-works and multi-family projects often ask for more — $2,000,000 per occurrence, or a $5,000,000 or higher total that you reach by stacking an umbrella or excess policy over the general liability.

These numbers are a contract matter, not California law. No California statute sets the limits a general contractor may demand from a subcontractor. The only limit the state imposes on a plumbing contractor is the CSLB requirement for LLC licensees (at least $1,000,000, rising with personnel of record), and even that is a licensing minimum, not a cap on what a customer can ask for.

The limits are usually only part of the insurance exhibit. The same section typically asks you to name the general contractor and owner as additional insureds for ongoing and completed operations, to make your coverage primary and non-contributory, to waive subrogation, and sometimes to carry the coverage for a stated number of years after completion. Each of those is a separate endorsement that your carrier may or may not offer on your policy.

Before you sign, send the insurance exhibit to your broker. If the contract asks for something your policy cannot provide, it is far better to negotiate the exhibit than to discover the gap when the certificate is rejected — or after a loss.

Generally yes for the resulting damage to other people's property, and generally no for the cost of redoing your own work, subject to the policy's terms, exclusions and endorsements.

A standard commercial general liability form pays damages you become legally obligated to pay because of property damage caused by an occurrence — an accident, including continuous or repeated exposure to the same condition. A cross-threaded flex connector that lets go five weeks after you leave and soaks the ceiling below is the classic example. The drywall, flooring, cabinets and contents the water ruined are third-party property damage, and because the work was finished, the claim falls under the policy's products-completed operations coverage. The carrier generally pays the covered damages, less any deductible, and defends you if the customer or their insurer sues.

What the form generally does not pay for is the connector itself and your labor to redo the connection. The "damage to your work" exclusion removes the cost of repairing or replacing your own defective work, and the "damage to property" exclusions remove damage to the particular part of the property you were working on at the time. The policy is not a warranty on your installation.

Close cases turn on the endorsements. Many contractor policies carry a fungi or bacteria exclusion that removes mold remediation, a pollution exclusion that carriers have applied to sewage, and sometimes exclusions for prior work, residential or multi-family work, or uninsured subcontractors. Read those before the first slow leak, not after.

Completed operations coverage is the part of a general liability policy that responds to bodily injury or property damage that happens after your work is finished and you have left the job, or after the work has been put to its intended use. For a plumber it is the most important coverage on the policy.

A standard commercial general liability form splits liability into two buckets. Premises/operations covers what goes wrong while you are on site and working — a dropped tool, a flooded floor during a repipe. Products-completed operations covers what goes wrong later — the water heater connection that weeps behind a wall for a month, the slab leak at last spring's repair, the gas fitting that fails after inspection. Almost every expensive plumbing claim is a completed-operations claim, because leaks develop over time and are discovered after you have been paid.

Completed operations usually carries its own aggregate limit on the declarations page, separate from the general aggregate. Check that it is there, that it matches your occurrence limit, and that no endorsement removes or sublimits it. A policy with completed operations stripped out is cheap for a reason, and a general contractor's insurance exhibit will reject it.

Coverage generally applies under the policy in force when the damage occurs, not when the work was done, so keep continuous coverage even in slow years. Many subcontracts also ask you to name the general contractor as an additional insured for completed operations, which requires a specific endorsement.

An additional insured endorsement extends your general liability policy so that another party — usually the general contractor, the property owner or a property manager — has coverage under your policy for claims arising out of your work. If a tenant sues the owner and the GC after your supply line floods the building, the endorsement lets them turn to your carrier for defense and indemnity.

Two distinctions matter when you read a contract's insurance exhibit.

Ongoing versus completed operations. The common ongoing-operations endorsement covers the additional insured only for damage that happens while you are still performing work. Most plumbing losses surface after you leave, so contracts increasingly require a separate completed-operations additional insured endorsement as well. A certificate that lists only the ongoing form will not satisfy a contract that asks for both.

Blanket versus scheduled. A scheduled endorsement names one specific party, and each new GC or owner means a new endorsement and often a fee. A blanket endorsement automatically covers any party you are required by written contract to add — which is how most working contractors handle it. Blanket forms generally only apply where a signed contract requires the status, so keep your signed subcontracts.

Additional insured status is a contract requirement, not California law, and carriers differ on what they offer. The additional insured shares your limits, exclusions and conditions, and coverage generally applies only to the extent your work caused the loss. Ask for the endorsement wording, not a summary.

"Primary and non-contributory" means that when the general contractor or owner is an additional insured on your policy and a claim arises from your work, your policy pays first (primary) and does not ask their policy to share the loss (non-contributory).

Without that wording, two general liability policies covering the same loss would generally apply their "other insurance" conditions, and the carriers would split the claim by a formula. The GC's carrier would pay part of a loss your crew caused, which shows up on the GC's loss history and raises its premium. The GC's contract requires primary and non-contributory language to prevent exactly that.

On a standard commercial general liability form, the wording is added by endorsement. Some carriers include it in a package of contractor endorsements with the blanket additional insured and waiver of subrogation forms; others charge for it or will not offer it. The endorsement generally applies only where a written contract signed before the loss requires it, and only for the additional insured named in that contract.

Checking the box on a certificate of insurance does not make it true. The certificate is only evidence; the endorsement on the policy is what controls. If a GC's insurance exhibit asks for primary and non-contributory status, send the exhibit to your broker before you sign so the policy actually carries the endorsement the certificate will describe. This is a contract and carrier matter, not a California legal requirement.

A waiver of subrogation is an endorsement under which your insurer gives up its right to recover from a specified party — usually the general contractor or owner — money it paid on a claim. Subrogation is the process by which a carrier that pays its insured then pursues whoever caused the loss. The waiver turns that off in one direction.

Here is why a GC asks for it. Suppose your apprentice is hurt on a GC's jobsite because of a condition the GC created. Your workers' compensation carrier pays the claim, then sues the GC to recover what it paid. The GC wants its subcontractors' carriers to waive that right so it is not sued over losses on its own project. The same logic applies to general liability: if your carrier pays a property damage claim and part of the fault was the GC's, the waiver keeps your carrier from pursuing the GC.

The waiver is usually offered as a blanket endorsement covering any party you are required by written contract to waive against, or as a scheduled endorsement naming one party. It is requested on general liability, workers' compensation and commercial auto policies. It does not reduce your own coverage, but carriers may charge for it and some will not offer it on every line.

A waiver of subrogation is a contract requirement, not California law. Send the insurance exhibit to your broker before signing to confirm the endorsement is available on each policy the contract names.

A certificate of insurance is a one-page summary, issued by your broker or carrier, showing the policies you carry, the carriers, policy numbers, dates and limits. It is evidence that coverage exists on the date it is issued. It is not a policy, and it confers no rights on the holder.

The standard certificate form says so in its own text: it is issued as a matter of information only, does not amend, extend or alter the coverage afforded by the policies, and does not constitute a contract between the insurer and the certificate holder. A general contractor listed only as certificate holder has no coverage under your policy. Coverage for the GC comes from an additional insured endorsement actually attached to the policy; the certificate can only describe what that endorsement provides.

This matters in two directions. When a GC asks for a certificate showing additional insured status, primary and non-contributory wording and a waiver of subrogation, the certificate is only truthful if the policy carries those endorsements; ask your broker to attach copies. And when you hire a subcontractor, a certificate tells you the sub had coverage on the day it was issued — nothing more. The policy can be cancelled the next week, and the holder is generally not entitled to notice unless the policy itself provides it.

Certificate requirements are a contract matter between you and your customer, not California law. Keep every certificate you issue and every one you collect with the related contract.

No. A standard commercial general liability form excludes bodily injury to your own employees arising out of their employment. Injuries to your crew belong to workers' compensation, which is a separate policy and, in California, a legal requirement.

The general liability policy is built for claims by third parties — a customer, a tenant, another trade's worker, a passer-by. When your own apprentice is burned soldering a joint or hurt lifting a water heater, the policy's employer's liability exclusion applies, and the carrier generally will not defend or pay. The exclusion is not an oversight; the two coverages are designed not to overlap.

California law requires every employer with one or more employees to carry workers' compensation insurance (Labor Code §3700). For a CSLB licensee, proof of coverage or an exemption certificate must be on file with CSLB, and an exemption becomes invalid the moment you hire an employee. Operating with employees and no coverage is a misdemeanor, exposes you to stop orders and civil penalties, and leads to license suspension.

A workers' compensation policy also carries employer's liability coverage (often called Part Two). It responds to the less common employee-related suits that fall outside the no-fault benefit system — a spouse's claim, or a third party that was sued by your injured employee and turns around and sues you. When a general contractor's exhibit asks for "employer's liability" limits, it is asking about your workers' compensation policy, not your general liability.

Generally no. A standard commercial general liability form pays for damage your work does to other property, not to repair, replace or redo your own work or the item you were installing. Three exclusions do that, subject to the policy's terms and endorsements.

"Your work." The form excludes property damage to your own completed work arising out of it. The fitting that failed, the repipe that has to be opened back up — the cost to redo those is yours. The standard form carries an exception for defective work performed on your behalf by a subcontractor, though some carriers remove that exception by endorsement.

"That particular part" you are working on — exclusion j(5). Damage to the specific part of real property on which you are performing operations, arising out of those operations, is excluded. Crack the customer's tile while setting a flange and the tile is generally excluded; the ceiling below that a leaking flange ruins later is generally covered.

Property that must be restored because your work was incorrectly performed — exclusion j(6). This removes the cost of reopening and redoing the work itself. It does not apply within the completed-operations hazard, which is why damage that surfaces after you leave is treated differently.

Where "that particular part" starts and stops — the connector, the heater, the whole laundry room — is the most common dispute in plumbing property claims. Photograph what you touched and what you did not, and fix the small thing on your own dime.

Often not, even when the leak itself is covered. Many contractor general liability policies carry a fungi or bacteria exclusion that removes coverage for damage, testing, remediation and cleanup related to mold, regardless of what caused the moisture. Whether yours does depends on the endorsements attached to your policy, not on the base form.

The sequence is familiar. A fitting weeps inside a wall for weeks before anyone notices. The water damage to drywall and flooring is third-party property damage under the completed-operations part of the policy and is generally covered. Then the remediation contractor opens the wall and finds mold. With a fungi/bacteria exclusion in place, the carrier generally pays the water damage and declines the mold — often the expensive part of a slow-leak claim.

There are variations. Some carriers write the exclusion as absolute. Others offer a limited buy-back with a small sublimit, sometimes only for mold that results from a covered water loss. Some policies carry no fungi exclusion at all. You will not know which you have from a certificate or quote summary; read the endorsement schedule.

The exclusion is a carrier decision, not a California requirement, so it is negotiable at placement and renewal. Ask your broker: does the policy have a fungi or bacteria exclusion, and if so, is a buy-back available and at what sublimit? Get the answer in writing, and respond to every leak report fast — the sooner the drying starts, the less there is to argue about.

It depends on the policy's pollution exclusion, and this is one of the less settled areas of contractor liability coverage. A sewage backup caused by your work is property damage from an occurrence, so on its face a standard commercial general liability form responds. The question is whether raw sewage counts as a "pollutant" that the exclusion removes.

Many contractor policies carry a total pollution exclusion that removes coverage for damage arising out of the discharge, release or escape of pollutants, defined broadly as any solid, liquid, gaseous or thermal irritant or contaminant, including waste. Carriers have taken the position that raw sewage, and some drain-cleaning chemicals, fall within that definition. Courts have gone both ways, depending on the exact wording of the exclusion and the facts of the loss, so neither you nor the carrier can assume the answer in advance.

If drain, sewer, septic or grease-trap work is part of your business, treat this as a placement question, not a claim question. Ask your broker to confirm in writing how the carrier treats sewage releases, and whether a limited pollution endorsement or a contractor's pollution liability policy is available to fill the gap. Some contractor programs carry an exception for sewage backup caused by the insured's work; many do not.

The exclusion and any exception are carrier terms, not California law, and they vary by policy. The time to find out which you have is at quote and renewal, not after a backup floods a finished basement.

Usually when a contract asks for higher limits than your general liability policy carries, or when the size of your work means a single bad loss could exceed your primary limits. No California law requires a plumbing contractor to carry an umbrella; the only state-mandated liability limit is the CSLB requirement for LLC licensees, which can be met with primary coverage.

An umbrella (or excess liability) policy sits over your general liability, commercial auto liability and the employer's liability part of your workers' compensation policy. When a covered claim exhausts the limit of an underlying policy, the umbrella pays the rest, up to its own limit. Because it responds only after the primary policy has paid, it is generally the least expensive way to add a large amount of limit.

Common triggers for a plumbing contractor:

• A general contractor's or owner's insurance exhibit asks for $2,000,000 per occurrence, or $5,000,000 or more in total, reached by stacking the umbrella over a $1,000,000 primary policy.
• Commercial, multi-family, public-works or hospital work, where property values and the number of people exposed to a gas or water loss are high.
• A growing service fleet, since a van in a freeway collision is often the likeliest seven-figure claim.

Check the umbrella's terms, not just its limit. Some follow the underlying exclusions and some add their own, and most require specified minimum underlying limits. If a contract extends additional insured and primary and non-contributory requirements to the umbrella, confirm that before signing.

An occurrence policy covers bodily injury or property damage that happens during the policy period, no matter when the claim is made — even years after the policy has expired. A claims-made policy covers claims first made against you during the policy period, usually with a retroactive date that excludes earlier damage. Most contractor general liability policies are written on an occurrence form, and for a plumber that is the form you want.

The reason is the nature of plumbing losses. A water heater connection you made under your 2024 policy can fail in 2027. Under an occurrence form, the 2027 damage is covered by the policy in force when the damage happened, under that policy's terms and limits. Under a claims-made form, you would need claims-made coverage with a retroactive date earlier than the work in force when the claim is first made — and if you had changed carriers, let the policy lapse or retired, you might have no coverage unless you bought an extended reporting period, or "tail."

Claims-made forms are standard for professional liability and some pollution and specialty coverages. On your general liability, confirm the declarations page says "occurrence." If a quote is noticeably cheaper, check this first.

Two cautions on occurrence forms. Coverage generally applies under the policy in force when the damage occurs, a frequent argument in slow-leak claims that span more than one policy year. And a gap in coverage is a gap forever for damage that occurs during it.