Whether your herbicide drift is covered depends on whether you carry chemical application coverage, because standard general liability commonly excludes pollution, which can include drift and overspray. A base GL policy may treat a drift claim as an excluded pollution loss. An applicator or pollution endorsement is what covers the chemical exposure, and it generally ties to holding the state applicator license required to spray commercially.
Why base GL may not cover drift
General liability is written with a broad pollution exclusion, and chemical drift or overspray can fall inside it. The exclusion in the ISO form is not a flat ban. It is triggered by location, and the paragraph that reaches a landscaper is the one covering pollutants brought to a job site in connection with your operations. A separate total pollution exclusion endorsement removes even that structure. A herbicide that drifts onto a neighbor’s yard, an overspray that damages a client’s lawn, or a misapplication that harms landscaping can be treated as a pollution claim your base GL does not cover. For a landscaper who sprays, that means the exact exposure of the work sits in an exclusion unless it is specifically addressed.
Whether the exclusion applies is a state-by-state question
There is no majority rule you can rely on. Florida’s Supreme Court applied the pollution exclusion to insecticide that drifted onto adjacent property while a helicopter was spraying citrus groves, in Deni Associates of Florida v. State Farm, 711 So. 2d 1135 (Fla. 1998). California’s Supreme Court went the other way on a pesticide claim, holding the exclusion did not plainly bar ordinary negligence involving toxic chemicals, in MacKinnon v. Truck Insurance Exchange, 31 Cal. 4th 635 (2003). Read that one carefully before relying on it. The policy wording in MacKinnon was a carrier’s own form, not the ISO paragraph, so it does not automatically decide a claim written on ISO wording. Whether it reaches your policy depends on the actual language, the jurisdiction and the facts. Illinois has limited the exclusion to traditional environmental pollution.
Oregon has no appellate decision we could find on whether the absolute or total pollution exclusion reaches properly applied herbicide. Anyone who tells you how an Oregon court would rule is guessing. The practical position is to treat drift as excluded until your own form and your own state’s law say otherwise, and to insure it deliberately rather than hope.
The client’s own lawn is a different problem
Drift onto a neighboring property and damage to the lawn you were hired to treat are two different coverage questions, and they do not have the same answer. Drift onto someone else’s property is the third-party pollution question an applicator endorsement is aimed at. Damage to the property you were actually working on generally runs into the damage-to-property exclusions instead, and after the job is finished into the damage-to-your-work exclusion. The applicator endorsements modify the pollution exclusion. The damage-to-property and damage-to-your-work exclusions are separate provisions, and the endorsements do not touch them. Oregon says much the same thing in its own licensing statute: the minimum financial responsibility a pesticide operator must file does not apply to damage to crops or property being worked upon, under ORS 634.116(5)(a). It is worth knowing which of the two you are trying to insure before you buy anything.
It is also worth knowing that some carriers exclude pesticide and herbicide application outright with no buy-back available, and that the answer in that case is often a separate contractors pollution liability policy rather than an endorsement. Those are frequently claims-made with their own retroactive date.
What an applicator endorsement adds
Coverage for chemical application generally comes through an applicator or contractors pollution endorsement written to cover the drift, overspray, and application damage the base GL excludes. The scope varies by form, so whether it covers drift onto neighboring property, and the specific chemicals and methods you use, is worth confirming. With the right endorsement, a drift claim can be covered rather than denied.
The licensing connection
Applying pesticides and herbicides commercially generally requires a state applicator license, and the licensing and the insurance work together. Operating without a required license creates regulatory and liability exposure and can affect your insurability, while a clean license supports your standing. Verify your state’s requirements with the licensing authority and make sure the coverage lines up with the work.
The exclusion, and the endorsement that answers it
The reason a base general liability policy may not respond to chemical drift is a specific piece of fine print: the pollution exclusion, which many carriers read to include damage from pesticides and herbicides applied off-target. If your neighbor’s ornamentals die from overspray or a treatment drifts onto the wrong property, that exclusion can be the whole ballgame. One answer is a limited pesticide and herbicide applicator endorsement, which adds coverage back for the application exposure the exclusion otherwise removes. It usually rides alongside your license: many states require a commercial applicator license to spray for hire, and in our experience carriers ask to see it before adding the endorsement. We have not seen a published underwriting rule requiring it, so treat that as what underwriters ask for rather than a rule. If any part of your work involves chemicals, confirm the endorsement is on the policy and that your applicator license is current, because the two are checked together when a drift claim comes in.
Questions to ask your advisor
- Does my policy cover chemical drift and overspray, or is it excluded?
- Do I have an applicator or pollution endorsement?
- Does the endorsement cover drift onto neighboring property?
- Is my state applicator license current for the work I do?
- Does the coverage match the specific chemicals and methods I use?
Chemical drift is one of the most predictable landscaping claims and one of the most commonly excluded. Base general liability’s pollution exclusion can sit right over your spray work, so an applicator endorsement that covers drift and overspray, matched to the chemicals you use and the license you hold, is what turns a killed-garden complaint somewhere to go. Whether it is paid still turns on your form and the facts.