General liability insurance for plumbing contractors
Pays when your plumbing work damages a third party's property or injures someone, most often a fitting or joint that fails and floods the space below after you leave.
Why Coverwatch
- Markets
- We reach the markets that write plumbing with the completed-operations tail intact, confirm the water-damage grant is on the dec page, and place shops a slab-leak claim non-renewed.
- Competition
- 60+ markets compete on the field that decides a plumbing claim: whether the products-completed operations aggregate is full and separate, and how the water-damage grant and 1099 sub cost price.
- Certificates
- We name the GC and owner additional insured for completed operations with CG 20 37, not CG 20 10 alone, and turn certificates fast so a fit-out subcontract does not stall.
For contractor
- What it covers
- Water damage to the building and its contents when a fitting or supply line you installed fails, plus backflow and sewage reaching third-party property.
- What it doesn't
- An injury to your own crew, which is workers compensation, and the cost to tear out and redo the failed joint itself.
Trusted by 60+ carrier partners
What does plumber general liability insurance cover?
Plumber general liability insurance covers third-party property damage and bodily injury from your work, most often water that floods the space below when a fitting or supply line you installed fails after the job. It also answers for backflow contamination and sewage on other property, and excludes crew injury and redoing the failed line itself.
Why plumber liability must cover long-tail water damage
A plumbing job looks finished the day the crew leaves, but a soldered joint or supply line that holds under test can weep once the system runs under pressure, and the water reaches the floor below.
The joint fails after you leave
A supply line, solder joint, or press fitting can pass the pressure test and still let go a season later, flooding the space below.
Backflow contaminates the potable supply
A failed backflow preventer or uncorrected cross-connection pulls irrigation or process water into the potable line.
Many jobs share one aggregate
A service shop closes dozens of jobs a year, and a bad run of installs can surface several water losses in one period.
How we get you covered
We take general liability for contractor to 60+ markets, build it to fit your contracts, and keep your certificates compliant.
Read your risk
We map what could actually go wrong in your operation, where a claim would come from, and who would bring it.
Shop 60+ markets
We take your risk to the carriers that know your class and make them compete on price and terms.
Build the endorsements
We add the endorsement wording that decides whether the policy responds to a claim, beyond the base form.
Keep you compliant
We handle the COIs, additional-insured certs, and renewals, so you are never the one chasing paperwork.
What's covered, and what isn't
In the policy
Water damage after an installed joint fails
A supply line, solder joint, or press fitting you installed weeps weeks after the job and floods the ceiling, drywall, flooring.
Backflow and cross-connection contamination
A backflow preventer that fails or a cross-connection left uncorrected pulls non-potable water into the potable supply.
Frozen-pipe burst tied to your work
A line you installed or a winterization you performed fails, and a pipe freezes and bursts, flooding the space below.
Sewage backup onto third-party property
A snaking job dislodges a clog downstream, or a line you set backs up and sewage reaches a finished basement or neighboring unit.
Third-party injury and personal and advertising injury
A visitor who slips on a wet floor your crew left, or a fixture that falls and injures a passerby, is a covered bodily-injury claim with defense.
Not in the policy
An injury to your own crew
A plumber or apprentice of yours hurt on the job is a workers compensation claim, statutorily excluded from general liability.
Covered by Workers Compensation
Drain chemicals and sewage treated as pollution
A hydrochloric or sulfuric acid opener that spills, or microbial contamination from a flooded return, is scoped out by the pollution exclusion.
Covered by Contractors Pollution Liability
Fixtures and copper damaged in transit
Water heaters, fixtures, press tools, drain cameras, and copper staged before installation and lost or damaged on the truck are first-party property.
Covered by Inland Marine
Accidents in your service vans
A collision in a service van, a trailer that comes loose, or tools damaged inside the cab are auto exposures excluded from the general liability form.
Covered by Commercial Auto
Tearing out and redoing the failed line itself
The cost to open the wall and replace the joint, fitting, or supply line you installed wrong is a business risk the insurer will not pay.
Covered by an uninsurable business risk, not a policy
The backflow test report you signed
Certifying a backflow assembly that later fails is an errors and omissions exposure, not a physical-damage claim.
Covered by Professional Liability / E&O
Claims general liability pays
Plumbing produces a narrow set of high-severity liability claims, and most trace to water that reaches property below after the job is done. These are the claims plumbers actually file, with the typical cost to defend and settle each.
A supply line fails weeks after a fixture install
A braided supply line or solder joint on a fixture you set lets go under pressure, flooding the unit and space below overnight.
$25K–$250K
A brazed joint drips onto tenant property below
A rooftop mechanical-room copper run develops a pinhole at a brazed joint six months after close-out and drips onto a tenant server rack below.
$50K–$500K
A backflow failure contaminates the potable supply
A reduced-pressure assembly you installed pulls irrigation water into the potable line, and the owner and water utility pursue the flushing, testing.
$25K–$300K
A frozen line you winterized bursts and floods
A supply line you ran or a seasonal system you winterized freezes and bursts, flooding a finished space below.
$25K–$200K
Ranges are typical defense and settlement bands for these claim types, not a quote. Actual exposure depends on service mix, job size, water-damage history, contract terms, location, and limits.
What contractor buyers are required to carry
The limits contracts and statutes set for this line, and what moves your premium and terms.
- Commercial GC subcontract
- $1M occ / $2M agg + completed ops
- Water purveyor tester agreement
- GL + additional insured
- Owner or lender completed-ops clause
- $1M / $5M umbrella
Requires $1M per occurrence and $2M aggregate, products-completed operations in force, the GC and owner named additional insured with CG 20 10 (ongoing) and CG 20 37 (completed), primary and noncontributory, plus a waiver of subrogation.
A water utility that adds a licensed backflow tester to its approved list requires proof of general liability and names the purveyor additional insured before the tester can certify assemblies in its district. The contamination a failed assembly causes is the claim it wants covered.
On larger commercial and institutional projects the owner or lender sets a $1M primary plus a $5M umbrella and requires products-completed operations to stay in force for a stated period after close-out, because the failure that floods the building surfaces after the crew leaves.
- Water-damage loss history
- A run of supply-line or slab-leak claims is the fastest way to raise a plumber's rate and shrink appetite.
- Subcontractor cost and payroll
- General liability rates on class 5183 payroll plus the cost of uninsured subs.
- Service mix and drain scope
- Residential service, commercial fit-out, and new construction price differently.
- Completed-operations limit and aggregate
- A full, separate products-completed operations aggregate matters more for a plumber than the general aggregate, because the claims surface after the job.
Endorsements that close the gaps
The base form is the start. These add-ons are where the policy gets built to fit contractor.
Additional insured, completed operations
CG 20 37Extends additional-insured status to the completed-operations period, the supply-line or joint failure that floods the building weeks later.
Water-damage liability grant
Decides whether a supply-line or slab-leak loss is paid.
Waiver of transfer of rights of recovery (waiver of subrogation)
CG 24 04Bars the plumber's carrier from recovering against the GC or owner after it pays a claim.
Primary and noncontributory
Requires the plumber's general liability to respond first and not seek contribution from the GC's or owner's own policy.
By the numbers
The form numbers, code basis, and loss data that surface when a plumber gets underwritten for general liability or answers a general contractor's certificate request.
- Water damage and freezing share of home claims
- 22.6% of losses, $15,400 average
- Your-work exclusion and subcontractor exception
- CG 00 01 exclusion l
- Grant the water-damage tail falls under
- Products-completed operations hazard
- Backflow and cross-connection code basis
- IPC Section 608
- Average plumber general liability premium
- About $115 per month
Water damage and freezing ran 19.8% to 28.7% of homeowners insurance losses from 2019 to 2023, 22.6% in 2023, with a $15,400 weighted average claim. About one in 67 insured homes files each year.
Exclusion l bars coverage for property damage to your own work within products-completed operations, which is why the failed joint itself is not paid. A 1986 ISO revision added a subcontractor exception for a sub's completed work.
A joint or supply line that fails after the crew leaves lands in the products-completed operations hazard, defined in CG 00 01 as injury or damage away from your premises arising out of your work. It draws on a separate aggregate.
Section 608 of the International Plumbing Code requires cross-connections to be protected by approved backflow prevention assemblies. A failed preventer that contaminates the potable supply is the third-party claim the general liability form answers for, distinct from the certified test report.
Plumbing businesses pay a median of roughly $115 a month, near $1,378 a year, for general liability on a $1M per-occurrence and $2M aggregate policy. Water-damage loss history and drain scope move the number from there.
Common questions
about general liability for contractor insurance
Usually yes, and it is the most common plumbing claim. A line or joint you installed can pass the pressure test and let go a season later. The resulting damage to ceilings, drywall, and tenant contents below is third-party property damage the policy answers for. Because the work was finished, it falls under products-completed operations, so confirm that aggregate is in force and the water-damage grant sits on the dec page. Replacing the joint is your business risk.
Yes, and it is not optional. General liability for plumbers rates on class 5183 payroll plus the cost of subs. A 1099 crew that cannot produce a current certificate naming you gets swept onto your policy at audit at the plumbing rate. Collect certificates before any crew reaches the job, with subs naming you additional insured. An uninsured subcontractor endorsement is a backstop, not a substitute, since an uninsured sub water loss hits your completed-operations aggregate.
The contamination usually yes, the signed test report no. When a backflow preventer you installed fails, or a cross-connection is left uncorrected, non-potable water reaching the potable supply is third-party property damage the form answers for. Certifying an assembly that later fails is an errors and omissions exposure on the report itself, so a certified tester carries backflow E&O on top of general liability. Utilities often require additional-insured status before listing you as an approved tester.
Generally no. Opening the wall to replace a joint or line you installed wrong is a business risk, not an insured loss. The policy covers the resulting water damage to other property, the drywall and contents ruined below, once it falls within products-completed operations. The standard form carries a subcontractor exception to the your-work exclusion, so a sub completed work is treated differently from yours. Read exclusion l before assuming a defect claim is covered.
Because the costliest plumbing claim usually arrives after the crew leaves. A brazed joint or press fitting that holds under test can let go weeks later, and the water reaches the space below. That is a products-completed operations claim, and ongoing-operations wording does nothing for it. A GC named with CG 20 10 alone is exposed for the later leak, so subcontracts require CG 20 37 alongside it, with the completed-operations aggregate kept full and separate.
It depends on the cause. If a line you installed or a system you winterized freezes and bursts from a defect in your work, the resulting water damage falls under completed operations and the policy responds. If the pipe was pre-existing and froze because the owner let the heat drop, that is not your work and the policy does not answer. Documenting the install and pressure test is your best evidence if the claim is contested.
Focus on the work.
We'll be your risk team.
Send us your policy and a licensed advisor checks your general liability against 60+ carriers, flagging gaps and overpricing. If your limits already hold up, we'll tell you.
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