The Power Line & Utility Exclusion Every Arborist Should Check

By Tamir Lerner · Thrive Risk Management (Encino, CA) · Updated 2026

Of every exclusion in a tree service policy, the power-line and utility exclusion is the one most likely to turn a routine job into an uninsured tragedy. Contact with an energized conductor can kill a climber instantly, start a fire, or knock out power to a neighborhood. Insurers know it, so they draw a bright line around line-clearance work. Here is what that exclusion says, what the safety rules require, and how to get covered properly.

What is a power-line or utility proximity exclusion?

It is language in your general liability or workers' compensation policy that removes coverage for injuries and damage arising from work performed within a stated distance of energized power lines, or for line-clearance operations generally. In practice, if a crew is trimming a tree that grew into a distribution line and a limb bridges the conductor, the carrier can deny the claim entirely on the grounds that the work was excluded. The exclusion often references regulatory minimum approach distances, so the safety rule and the coverage trigger are linked.

What do Cal/OSHA and ANSI Z133 require near power lines?

California treats line-clearance tree trimming as specialized, higher-risk work. Cal/OSHA sets minimum approach distances from energized conductors, and unqualified tree workers must keep well clear of lines, with only qualified line-clearance tree trimmers permitted to work inside those distances after specific training and precautions. The industry consensus standard, ANSI Z133, reinforces these minimum approach distances and the qualifications required. Voltage matters: the higher the line voltage, the greater the required clearance. Working inside those distances without qualification is both a safety violation and, usually, an insurance exclusion trigger.

Why do carriers exclude this work?

Line-contact losses are among the most severe in the trade. A single electrocution can produce a wrongful-death claim, and utility-outage or wildfire damage can multiply the exposure into the millions. Rather than build that severity into every tree policy, carriers exclude line-clearance work and then offer it back, selectively, to qualified operations willing to document training and pay for the risk. That is why a standard trimming policy will not respond to a near-line claim unless the exposure was disclosed and endorsed.

How do you know if your policy has this exclusion?

• Read the exclusions section of your general liability form for language about "power lines," "energized," "electrical conductors," or "line clearance."
• Look for a stated minimum distance from lines below which coverage does not apply.
• Check whether "line-clearance tree trimming" is listed as an excluded operation.
• Confirm how your workers' comp treats a line-contact injury, not just your liability policy.
• Ask your agent, in writing, whether utility-adjacent work is covered or endorsed.

How arborists get covered for near-line work

If you regularly work near lines, you need a carrier that will underwrite line-clearance exposure, and you need to earn it. That typically means employing qualified line-clearance tree trimmers, training crews to Cal/OSHA and ANSI Z133 minimum approach distances, using proper insulated tools and procedures, and coordinating with the utility to de-energize or cover lines where required. With that foundation, an agent who specializes in tree service can place coverage that specifically includes the work, rather than leaving it in the exclusion zone. Employing ISA Certified Arborists and documenting your safety program strengthens the submission.

What if you only occasionally work near lines?

Even occasional near-line work is dangerous both physically and financially. If you are not qualified and equipped for line-clearance work, the safest answer is to refer that portion of the job to a qualified line-clearance contractor or coordinate with the utility. Do not assume a limb "close" to a line is covered, because the exclusion does not care how routine the job felt. Confirm coverage before the saw ever comes out.

The bottom line for California arborists

The power-line exclusion is quiet until a claim, and then it is final. Match your CSLB D-49 tree service credentials, your crew qualifications, and your insurance to the real proximity of your work. If any part of your business touches utility lines, have that conversation with a specialist agent before the next job, not after an incident.