Plumbing contractors work with water, gas and sewer lines inside homes, apartments and commercial buildings, and the claims that follow tend to be about what that water does after it gets loose. Owners also carry crews in trenches and crawl spaces, a fleet of service vehicles and contracts that shift risk from the GC or owner onto them.

This page explains the insurance issues that matter most to plumbing business owners in North Central and Northeast Florida, written as plain education.

What plumbing owners deal with day to day

  • Water damage. A failed fitting, a missed joint or a supply line that wasn’t tightened can soak floors, drywall and a downstairs unit.
  • Sewer backups. Work on drains and sewer lines can lead to backups into a customer’s building.
  • Gas lines. Florida plumbing contractors may install natural gas and LP piping, which brings fire and explosion exposure.
  • Excavation. Digging for sewer and water lines means trench hazards for your crew and the chance of hitting other buried utilities.
  • Confined spaces and crawl spaces. Tight spaces, heat, and sewer gases create injury risk.
  • Medical gas and specialty piping. Some plumbing work, like medical gas piping, carries higher stakes if something goes wrong.

Typical claims in plumbing work

Water damage from completed work is the claim plumbing contractors see most, and it can turn into a mold claim if the water sits. Sewer backups and damage to other buried lines during excavation are next. On the workers’ comp side, strains, cuts, falls and trench or confined space incidents are common. Vehicle accidents with service vans happen often because plumbers drive all day.

Coverage at a glance

Coverage Why it matters here Learn more
General liability, including completed operations Water damage, sewer backups and injuries tied to your work, during and after the job General liability
Workers’ compensation Required in construction with one employee Workers’ comp
Commercial auto Service vans and trucks, plus hired and non-owned auto Commercial auto
Inland marine (tools and equipment) Jetters, cameras, pipe threaders and tools that travel Ask us about tool and equipment coverage
Contractor’s pollution liability Mold, sewage and fuel releases that a general liability pollution exclusion can leave out Pollution coverage explained
Commercial umbrella Extra limits often required by commercial and apartment contracts Umbrella
Bonds License, permit and contract bonds Bonds

What your contracts ask for, in plain words

Most of the insurance questions plumbing contractors face start in a contract, not a policy. Before you sign, read the insurance section and the indemnity section together, because one tells you what you promised to pay for and the other tells you what insurance has to back it up. These are the terms you’ll see most:

  • Minimum limits. The contract lists dollar amounts for general liability, auto, workers’ comp employer’s liability and often an umbrella. Your limits have to meet or beat those numbers on the day you start work.
  • Additional insured. The general contractor or owner wants to be covered under your policy for claims that come out of your work. Many contracts ask for this both while you’re working (ongoing operations) and after the job is done (completed operations), and the endorsement on your policy has to match what the contract says.
  • Waiver of subrogation. After your insurance company pays a claim, it normally has the right to go after whoever caused the loss. A waiver gives up that right against the party named in the contract. It usually takes an endorsement, sometimes on several policies including workers’ comp.
  • Primary and noncontributory. If the contract asks for it and your policy has an endorsement that provides it, your policy pays first for the other party’s covered claim and doesn’t ask their own insurance to share the loss. It isn’t automatic; it takes endorsement wording.
  • Per project aggregate. Some contracts want your general liability aggregate limit to apply separately to each job, so a large claim on one project doesn’t use up the limit for the others.
  • Mold and water language. Apartment and commercial owners sometimes write contracts that make you responsible for mold or water intrusion. Check whether your policy has a mold or pollution exclusion that would leave that promise uninsured.

If a contract asks for something your policy can’t do, the time to find out is before you sign. Send us the insurance pages of the contract and we’ll tell you how they line up with your policy and what may need an endorsement. For indemnity and other legal terms, talk with your attorney.

Certificates of insurance: what you’ll be asked for

A certificate of insurance is the one-page summary a GC, owner or property manager asks to see before your crew can start. A certificate is for information only. It doesn’t change or add coverage, which is why careful GCs also ask for copies of the endorsements behind it. Expect requests to show:

  • Policy numbers, dates and limits for general liability, auto, workers’ comp and umbrella
  • The certificate holder’s exact legal name and address
  • Additional insured, waiver of subrogation and primary and noncontributory wording, with the endorsement forms attached when the contract calls for them
  • Workers’ comp coverage, or a copy of the exemption certificate for a qualifying corporate officer or LLC member

Keep one person in your office in charge of certificates, and keep a list of which jobs need updated ones at renewal. You can send requests through our certificate request form.

Workers’ comp for your crew and your subs

Florida treats plumbing as construction for workers’ comp. That changes the rules in three ways owners feel directly.

  • One employee is enough. In construction, a business with even one employee has to carry workers’ comp, and an owner who is a corporate officer or LLC member counts unless they’ve filed an exemption. Most non-construction businesses don’t have to until they have four or more employees, full- or part-time.
  • Officer exemptions are narrower. Up to three corporate officers or LLC members who each own at least 10% of the business (three total across affiliated companies) can apply for an exemption through the Division of Workers’ Compensation. It costs $50, lasts two years and is renewed online. An exempt officer or member isn’t covered for their own injuries, so think about health and disability coverage too.
  • You’re responsible for uninsured subs. Under Florida law, if a sub doesn’t have coverage, the contractor above them is treated as the employer of that sub’s workers for comp purposes. That’s why you have to collect each sub’s certificate or exemption before they start, and why it has to stay current for the whole job.

Why audits bring surprise charges

Comp premium starts as an estimate based on the payroll you expect. After the policy ends, the insurance company audits the real numbers. Florida’s audit rules tell auditors to review every source of payment to employees, subcontractors and independent contractors, and to look at the certificates your subs gave you. If a sub can’t show workers’ comp coverage or a valid exemption, Florida law counts the people you paid through that sub as your employees for comp purposes, so the auditor can add those payments to your payroll and charge premium on them. Construction employers large enough to have an experience mod must be audited at least once a year.

Being uninsured is expensive too. The state can issue a stop-work order, and the penalty is two times what the employer would have paid in premium over the prior 12 months, or $1,000, whichever is more.

Report every injury to us or your insurance company right away. Florida requires the employer to report an injury to its carrier within 7 days after learning of it. Read more on our workers’ compensation page.

Your experience mod (EMR): what it is and why GCs ask

If your workers’ comp premium is large enough, your business gets an experience modification factor, often called the mod or EMR. It compares your company’s actual workers’ comp losses with what’s expected for a business of your size doing the same type of work. A mod of 1.00 is average. Below 1.00 is a credit, and above 1.00 is a debit that raises your premium. Small or new businesses that don’t meet the size threshold don’t have one.

Who calculates it in Florida

Florida uses the experience rating plan run by NCCI, the National Council on Compensation Insurance. NCCI calculates the mod, not your agent and not your insurance company. It normally uses three years of payroll and claims, and it leaves out the most recent year before the mod takes effect, because those claims are still too new to judge.

Why it matters when you bid

General contractors, owners and bid packages often ask for your mod, and some use it to prequalify plumbing subs before you’re allowed to bid. A mod above 1.00 can keep you off a bid list even when your price is right, because the GC reads it as a sign of how safely you work.

Why frequency usually moves it more than one big claim

The formula weighs the first part of every claim heavily and only part of the cost above that. So a string of small injuries usually raises a mod more than one large one. Under NCCI’s experience rating plan, a medical-only claim (one with no lost-time benefits) generally counts at only 30% of its cost in your mod where NCCI’s Experience Rating Adjustment applies. Report every injury, even small ones. Florida requires employers to report an injury to their insurance company within 7 days of learning of it, and paying a claim yourself instead of reporting it can put you out of compliance and leave the worker without benefits the law gives them. Where the ERA applies, medical-only claims already count at a reduced value in the mod, so there’s little reason to pay them yourself.

What you can do about your mod

  • Run a written safety program that fits your actual work, and hold short, regular crew talks, for example on trench safety, confined spaces and lifting
  • Report every injury the same day, so the claim is handled before costs grow
  • Offer light or modified duty so injured workers can come back sooner, since lost-time claims usually cost more than medical-only ones
  • Ask us for your mod worksheet each year and check it: wrong payroll, a claim that isn’t yours or a closed claim still showing reserves can all push the number up
  • Make sure each employee is in the right class code and your payroll is reported correctly, because the mod is built on those numbers

Want to go deeper? Our experience mod guide explains which years count, why small claims add up and how to read your mod worksheet.

Vans, tools and equipment

Service vans need commercial auto coverage, with every driver listed and their driving records checked. If employees drive their own vehicles for work, hired and non-owned auto coverage can respond, subject to the policy’s terms and limits, if your business is held responsible for an accident they cause. The employee’s own auto policy usually pays first, and this coverage doesn’t pay for damage to the employee’s car or protect the employee personally. We explain more in our post on employees driving personal vehicles.

Drain cameras, jetters, pipe threaders and other equipment are expensive and mobile. Inland marine coverage follows them from the shop to the van to the job. Keep a list with serial numbers and photos, and update it when you buy new gear.

Florida licensing and bonds

Florida licenses plumbing contractors through the Construction Industry Licensing Board. A state plumbing license covers a broad scope, including water and sewer lines, gas lines, irrigation and some specialty piping, without a separate local license for those items. Licensed contractors must carry general liability and property damage insurance in amounts set by board rule and show workers’ comp coverage or an exemption.

Before any digging, Florida law requires you to notify Sunshine 811 at least two full business days ahead so underground facilities can be marked. A ticket is good for 30 calendar days.

See Florida contractor license insurance and bond rules for the minimum amounts, audits and bond rules.

Practical risk management steps

  • Pressure test new work and document the result with photos
  • Use a written checklist for every connection and supply line before leaving
  • Call Sunshine 811 before every dig and keep the ticket number on the job paperwork
  • Use trench boxes or shoring where required and have a competent person check trenches daily
  • Follow confined space rules before entering manholes and vaults
  • Teach crews to shut off water fast and know where the main is on every job
  • Run motor vehicle record checks on every driver

Questions to ask before you renew

  • Does my general liability have a mold, fungi or pollution exclusion that would affect water damage claims?
  • Do I need contractor’s pollution liability for sewage, mold or fuel?
  • Is completed operations included, and for how long?
  • Do my additional insured endorsements match my apartment and commercial customers’ contracts?
  • Are my vans, drivers and tools listed correctly?
  • What is my experience mod, and does the worksheet look right?
  • Is my umbrella enough for the property managers and GCs I work for?

Frequently asked questions

Does general liability cover water damage from a leak after we finish?

Usually that’s a completed operations claim, which most contractor general liability policies include. Look for mold or water exclusions that could limit it.

Is mold covered?

Many general liability policies exclude or limit mold. Contractor’s pollution liability can fill that gap. Ask us to check your policy.

Do I have to call 811 before digging?

Yes. Florida law requires notice to Sunshine 811 at least two full business days before you dig.

Do I need workers’ comp with one employee?

Yes. Plumbing is construction under Florida’s workers’ comp law, so one employee is enough. Qualifying corporate officers or LLC members can apply for an exemption.

What is an experience mod?

It’s a number NCCI calculates from about three years of your workers’ comp payroll and claims, leaving out the most recent year. 1.00 is average, and many GCs ask for it.

Are my drain cameras and jetters covered on the van?

Usually not under your auto policy. Inland marine coverage is the usual way to cover tools and equipment that travel.

What should my certificate show for an apartment complex?

Usually your general liability, auto, workers’ comp and umbrella limits, plus any additional insured or waiver wording the management contract requires.

Sources

General information, not legal or coverage advice. Coverage depends on the policy issued, its terms and underwriting, and contract requirements depend on the contract you sign. Check licensing and safety rules with the agency that enforces them.

McGriff-Williams Insurance is an independent insurance agency in Gainesville, in business since 1983 and licensed in Florida. We’re at 3501 W University Ave, Gainesville, FL 32607. Questions: (352) 371-7977, Monday to Friday, 9 a.m. to 5 p.m.

Last updated October 31, 2026