Plumbing Operations & Specialized Risks: FAQs for California plumbers

Most general contractors require a plumbing subcontractor to carry general liability, workers' compensation, commercial auto and, on larger jobs, an umbrella, and to prove it with a certificate of insurance before the first day on site. These are contract requirements, not California law; the state requires workers' compensation once you have employees and a license bond for every licensee, and the rest is the GC's own risk management written into the subcontract.

A typical insurance exhibit asks for:

• General liability with per-occurrence and aggregate limits (commonly $1,000,000 per occurrence and $2,000,000 aggregate), with the GC and owner named as additional insureds for ongoing and completed operations, primary and non-contributory wording, and a waiver of subrogation.
• Workers' compensation at statutory limits with employers' liability limits stated in the contract, plus a waiver of subrogation in the GC's favor.
• Commercial auto liability, commonly $1,000,000 combined single limit, covering owned, hired and non-owned vehicles.
• Umbrella or excess liability on commercial, multi-family and public work, in amounts set by the contract.
• Notice of cancellation to the GC, and sometimes pollution liability for underground or sewer work.

Two cautions. A certificate only reports what the policy says; the additional insured and primary wording have to be endorsed onto the policy or the GC's compliance desk will reject it. And not every carrier offers every item, so send the exhibit to your producer before you sign. Agreeing to coverage you cannot buy is a contract problem, not an insurance one.

Not in the way most contractors assume. Your policies are written for your company and your employees, and a subcontractor is expected to bring its own coverage. When a sub does not, two different rules pull that sub back onto your account.

California law. Labor Code section 2750.5 generally provides that a worker doing work that requires a contractor's license is presumed to be an employee, and a person without the required license cannot be an independent contractor. In practice, the workers of an unlicensed subcontractor are treated as your employees for workers' compensation purposes. If one of them is hurt on your job, the claim is likely yours, and it will sit in your experience rating like any other claim.

Your carrier. At the workers' compensation audit, and usually the general liability audit too, the auditor asks for a certificate of insurance from every subcontractor you paid. A licensed sub who cannot produce a valid certificate for the period of the work is treated as uninsured, and the cost of that sub's labor is charged to you as payroll or receipts, with premium due on it. Some general liability policies also carry exclusions or warranties about subcontractors that can remove coverage for their work entirely.

Before any sub starts, verify the license number on the CSLB website, collect certificates for workers' compensation and general liability, ask for additional insured status, and keep the file. Those documents are what the auditor, and later the adjuster, will ask for.

Yes. Trenching, sewer lateral replacement, water service and gas line work below grade are underwriting questions on every general liability and workers' compensation application, and the answers can change which carriers will quote you, what they exclude and what they charge.

On the general liability side, underwriters ask what share of your receipts comes from underground work, how deep you dig, whether you use shoring or trench boxes, how you locate utilities before digging, and whether you use directional boring. Some policies restrict or exclude damage from collapse, from striking underground utilities or from excavation beyond a certain depth, and some carriers will not write a plumbing contractor whose underground share is above their appetite. Read the exclusions page, not just the declarations.

On the workers' compensation side, a trench collapse is one of the most serious injury exposures in the trade, and Cal/OSHA's excavation rules set requirements for protective systems, inspections and a competent person on site. The carrier's loss control contact may ask about your trench safety program, and a serious citation can affect renewal. Payroll for some underground operations may also raise classification questions, so describe the work accurately rather than letting an auditor reclassify it later.

Tell your producer before you take on more underground work than your application described, and ask in writing whether your current policies cover it. For the current Cal/OSHA excavation requirements, consult DIR directly rather than relying on a summary.

Only if the application described it. A general liability policy is underwritten on the operations you told the carrier about, and a claim from work the carrier did not price can be contested. Sewer and drain cleaning is ordinary C-36 work and most plumbing carriers expect it, but "service and repair" on an application is not the same as "hydro-jetting commercial grease lines," so list the work you do.

Three exposures deserve attention. First, damage to the line you are working on: a cable that breaks through an old clay lateral is damage to property in your care or to "that particular part" of property you are working on, which standard general liability forms generally exclude; the resulting damage to the customer's floor or the neighbor's unit is the part the policy is designed to respond to, subject to its terms.

Second, sewage backups. Carriers and courts have at times treated raw sewage as a "pollutant" under the standard pollution exclusion, which can turn a flooded basement claim into a coverage dispute. Some policies carry a limited exception or a pollution buy-back; some do not. Ask your producer which you have.

Third, the equipment: jetters, cameras and locators are not covered by general liability or auto and belong on a contractor's equipment policy.

If you are moving into camera inspection, jetting or trenchless lining, tell your producer before you market it.

Yes, mostly on the general liability side. Underwriters price and restrict new-construction plumbing differently from service and repair because the claims look different: a service company's losses are mostly water damage discovered quickly; a rough-in contractor's losses can surface years after the slab is poured, in a building full of owners who were not the customer.

The practical differences:

• Completed operations. Claims from new construction tend to arrive later and larger, so carriers look hard at the completed operations exposure and at how long you have been doing the work.
• Residential and condominium exclusions. Many contractor general liability policies exclude or restrict new residential construction, tract housing, condominiums and apartment conversions, or limit the number of units. A policy that is fine for service work may have a residential exclusion you never noticed.
• Receipts split. Applications ask what percentage of revenue is new construction, remodel and service, and whether it is residential or commercial. Changes in that mix should be reported.
• Contract requirements. General contractors on new builds ask for additional insured status for completed operations, primary and non-contributory wording and waivers, which not every policy can provide.

Workers' compensation is less affected: the plumbing classification is generally the same for both kinds of work, though payroll volume and crew size change the premium. Before you bid a new-construction job, confirm in writing that your general liability has no residential, condominium or new-construction exclusion that would apply.

Pollution liability covers bodily injury, property damage and cleanup costs caused by the release of a pollutant from your work, which a standard general liability policy largely excludes. Whether a plumber needs it depends on the work; for some plumbing operations the gap is real.

The standard commercial general liability form carries a pollution exclusion that, in general terms, removes coverage for the discharge of "pollutants" at or from a site where you are working. The word is defined broadly, and carriers have applied it to things a plumber touches every week: sewage backing up into a building, fuel oil released while replacing a boiler or oil-fired water heater, drain chemicals and solvents, and natural gas or propane. Some general liability policies add back limited coverage through a "time element" or sudden-and-accidental endorsement; many do not, and the exact wording decides the claim.

A contractor's pollution liability (CPL) policy is a separate policy written to fill that gap for the contractor's own operations and completed work. It is common on commercial, industrial, municipal and underground work, and general contractors and public agencies sometimes require it in the subcontract.

Whether you need one is an underwriting conversation: a residential service shop may be adequately served by a general liability policy with a pollution buy-back, while a company doing sewer mains, fuel lines or medical gas has an exposure the general liability form was not built for. Ask your producer to show you where your current policy's pollution exclusion begins and ends.

With a contractor's equipment policy, usually written on an inland marine form, which covers your tools and equipment against theft and damage wherever they are: in the van, on the jobsite, in the shop or in storage. Neither your general liability nor your commercial auto policy covers the tools themselves.

The policy is built in two layers. Scheduled items are listed individually with a serial number and a stated value, and that is the normal approach for anything expensive: sewer cameras, locators, trailer-mounted jetters, press tools, threading machines, trench shoring. Blanket coverage insures the rest — hand tools, drain machines, cordless tools, small meters — under one total limit with a per-item cap, so you do not have to list every wrench. The blanket limit should reflect what is actually in all of your vans added together, not one van.

Read the conditions before you rely on them. Theft from an unattended vehicle usually requires the vehicle to have been locked and show evidence of forced entry; some forms limit overnight theft on the street. Check whether the policy pays replacement cost or actual cash value (replacement cost minus depreciation), what the deductible is, whether employee-owned tools are included, and whether rented or borrowed equipment is covered up to a stated limit.

Keep an inventory with serial numbers, photos and receipts, and update the schedule when you buy or sell a major item. At claim time the adjuster pays from the list, not from memory.

Stop the damage, document everything, and notify your carrier the same day. Do it in that order, and do not promise the customer anything about who will pay.

1. Mitigate. Shut off the water or gas, get the standing water up and, if it is a significant soak, get a drying contractor on site. Your policy requires reasonable steps to keep the loss from growing, and a carrier can question costs that grew because nobody acted.
2. Document. Photograph and video the source of the leak, the affected areas and the condition of the fitting or pipe before anyone repairs it. Keep the failed part. Write down the sequence of events while it is fresh, with times and names.
3. Notify your carrier promptly. General liability policies require notice of an occurrence "as soon as practicable," and late notice can cost you coverage. Report through your producer or the carrier's claims line even if you think the customer will not pursue it; a report is not an admission.
4. Do not admit liability or promise payment. Be professional and sympathetic, and tell the customer you have reported it and the adjuster will be in touch. Saying "we'll take care of it" can be read as an admission and can interfere with the carrier's handling of the claim. Do not pay out of pocket before talking to your producer.
5. Cooperate. Give the adjuster the documentation, the contract and the invoice, and keep your own copy of the file.

More than their dollar size suggests, because underwriters and the California experience rating plan both weigh frequency heavily. A company with eight small claims in three years is rated and viewed differently from one with a single large claim of the same total.

On workers' compensation, the effect is built into the X-Mod formula. Under the WCIRB plan each claim is split at a primary threshold that varies with employer size; the primary portion of every claim counts at full weight and the excess portion counts at no weight, after the first $250 of each claim is removed. A small claim is almost entirely primary, so several small claims push the mod up nearly dollar for dollar, while a large claim is capped by the threshold. The claims stay in the mod for three policy years. Avoiding frequency — first-aid handling, early return to work, keeping claims open no longer than necessary — is the most direct way to control the mod.

On general liability and commercial auto there is no formula, but the carrier reads your loss runs at every renewal. A pattern of small water damage or fender-bender claims signals process problems, and the response may be a higher premium, a larger deductible, exclusions, or non-renewal, which makes the next carrier's questions harder.

None of this means hiding claims. Policy conditions require prompt notice, and an unreported incident that later turns into a lawsuit is a bigger problem than a small paid claim. Report, then manage.

Partly, and workers' compensation is the policy most likely to leave you exposed, so ask before you send a crew across the state line.

General liability. The standard form's coverage territory is generally the United States, its territories and Canada, so a job in Nevada or Arizona is usually inside the territory, subject to the policy's terms. Underwriting is a separate question: your policy was priced on California operations, and some carriers restrict out-of-state work or want to know about it. Working in another state may also require a contractor's license there, which is a question for that state's board, not your policy.

Workers' compensation. This is where the gap is. A California policy lists California in Item 3.A of the information page. Coverage for employees working in other states depends on Item 3.C, "other states insurance," which lists the states where you may have incidental exposure, and on each state's own rules about when an out-of-state employer must carry coverage there. A few states run their own state funds and do not accept another state's policy at all. A long-term job in a state not listed in 3.C may leave an injured employee's claim uncovered and you facing that state's penalties.

Commercial auto. The policy territory is generally the United States and Canada, and most carriers extend liability to the limits a state requires when you drive there.

Before taking out-of-state work, give your producer the state, the duration and the crew size, and get the answer in writing.