Trees and Power Lines: Who Trims What on a Utah Property

Start with the only rule that matters

If any part of the tree, your ladder, your saw, or your body could come within ten feet of an overhead power line, the job is not yours.Not the utility’s preference — OSHA’s threshold for anyone who is not a qualified line-clearance tree trimmer. Above 50 kV the required distance grows further, by four inches for every additional 10 kV.

Rocky Mountain Power puts it more bluntly in its own customer guidance: never prune limbs or remove trees near power lines, because contacting a line can be fatal.

That is the whole safety answer, and everything below is detail. But the detail matters, because the question we actually get asked on Park City and Heber properties is not “is this dangerous?” It is “whose job is this, then?” — and that answer is genuinely unclear to most homeowners, partly because the information published about it is inconsistent.

Why this kills people who thought they were being careful

Three facts explain most tree-work electrocutions, and none of them are intuitive:

• You do not have to touch the line.Roughly half of tree-worker electrocution deaths involve indirect contact — through a limb, a pole saw, a wet rope, or the tree itself. A branch resting on a conductor can energize a whole tree.
• Lines that look insulated usually are not. The dark covering on most overhead conductors is weatherproofing, not insulation rated to protect a person.
• “Low voltage” still kills. The service-level lines running to a house are entirely capable of killing someone. People relax around them precisely because they are the smallest wires on the property.

One more, specific to this work: a qualified line-clearance trimmer working inside ten feet must have a second trimmer within normal voice range. That is a regulatory requirement, and it tells you something about the risk profile. If the professionals need a spotter, the homeowner with a pole saw does not have a workable plan.

A caution on what you will find searching this: at least one tree-industry page publishes a clearance table that does not match OSHA’s actual formula. Go to the OSHA source rather than a summary of it.

What Rocky Mountain Power does, free

Most homeowners substantially underestimate this. RMP runs a vegetation management program and states that these services are provided at no cost to customers:

• Routine pruning to maintain safe clearances around its lines.
• Tree growth regulators, selectively, to slow fast-growing species.
• Low-volume herbicide on non-landscape trees and directly on cut stumps to prevent regrowth, using EPA-registered products.
• Tree removalwhere a tree is a safety or reliability concern — plus removal of trees under six inches in diameter at chest height that were not intentionally planted. That volunteer-seedling rule quietly covers a lot of what comes up under lines on a Wasatch lot.
• Pole clearing— vegetation and combustible material cleared to eight feet high within a ten-foot radius of subject poles.

Wildfire areas get more. RMP applies more frequent inspections and additional pruning clearance in wildfire-risk areas, which on the Wasatch Back is most of the wooded terrain. Given how much of Utah now sits inside mapped high-risk boundaries under HB 48, that is worth knowing.

On removals, the company says it tries to get the property owner’s written permission before taking out a hazard tree, and that if the owner cannot be reached, removal may proceed without permission where public safety requires it.

And what the utility expects from you

The obligations run both directions. Easements generally permit the utility to prune or remove vegetation that blocks access to its equipment, and the company’s service requirements expect customers to keep trees and shrubs from interfering with access to poles, transformers, and meters — and to allow access for trimming when needed.

Also on the list: report vines or vegetation growing on poles, guy wires, or equipment, and keep pad-mounted transformers accessible.

The service drop — the question nobody answers cleanly

Here is where honesty is more useful than confidence. The most common version of this problem is a tree limb over the service drop— the line running from the pole to the attachment point on your house.

We went looking for a definitive answer on who is responsible for clearing vegetation off that specific span, and the utility’s published customer-facing materials we could reach do not spell it out.Contractor blogs confidently assert opposite answers — one says the service drop is the homeowner’s, another draws the line between transmission and distribution — and none of them cite a Utah statute or tariff. We are not going to add a fourth guess.

What we can tell you is the practical path, and it is better than the answer to the ownership question:

Rocky Mountain Power will provide a free temporary service disconnect when tree work requires access near the service line. That is stated in its own vegetation management material, and it is the single most useful thing in this article.

It changes the job completely. With the drop de-energized and dropped, a limb over your service line stops being a job nobody can legally touch and becomes ordinary tree work that a regular ISA-trained crew can do safely. You schedule the disconnect, the crew works, the utility reconnects.

Call 1-888-221-7070— the number RMP lists for tree questions, arborist requests, and vegetation reports — and ask about both the responsibility question for your specific address and a temporary disconnect. Do that before booking any crew.

If a tree is already on a line

Different situation, no judgment calls:

• Stay at least 35 feet away.That is RMP’s stated distance for downed lines.
• Assume it is energized. You cannot tell by looking, and a line can re-energize without warning.
• Do not touch anything the wire is touching— the tree, a fence, a vehicle, standing water.
• Call 911 first, then the utility at 1-888-221-7070.
• Keep people and pets back and warn anyone approaching until crews arrive.
• Do not let a tree crew start work— not ours, not anyone’s — until the utility has confirmed the line is de-energized.

After a storm, the division of labor is specific: the utility clears what it must to restore service, and the remainder of the downed tree is the property owner’s to deal with. That is the point at which a crew like ours picks it up — see our storm cleanup service, and our guide to how insurance handles tree damage for the claim sequence, since snow and wind are both covered perils.

Planting so you never have this problem

The cheapest line-clearance work is the tree nobody planted under the line. RMP publishes planting distances measured from the pole, keyed to the tree’s mature height:

• Small trees(mature height under 20 ft) — at least 20 feet from the pole.
• Medium trees (20–40 ft) — at least 40 feet.
• Large trees (over 40 ft) — at least 60 feet.

For underground service, keep ten feet clear in front of a pad-mounted transformer on the door side, and three feet on each side. Crews need to open those.

One honest wrinkle: an older RMP planting booklet gives different figures and measures from the center of the distribution line rather than from the pole. The two documents disagree, so confirm current numbers with the utility before planting rather than trusting either version second-hand.

Two more planting rules worth following:

• Call 811 at least 48 hours before you plant or dig. Underground lines do not announce themselves, and a planting hole is deep enough to find one.
• Look up before you start. Obvious, routinely skipped.

On species: near lines you want genuinely low-growing trees, and the mature height on the tag is the number that matters, not the size in the pot. Our firewise landscaping guide covers species selection for this climate, and usefully the two goals align — low, compact, broadleaf plantings are better under a line and better in a defensible-space plan than the conifers they replace. Our species field guide covers mature sizes for what grows here.

And a rule people are surprised to see in writing: no treehouses, swings, zip lines, or play structures in trees near power lines. It puts a person at height, in a tree, next to a conductor, repeatedly.

Trees, lines, and wildfire

Vegetation contacting conductors is a recognized wildfire ignition source, which is why utilities apply tighter standards in wildfire-risk areas and clear combustible material around poles. For a Wasatch Back owner this means the vegetation near your lines is doing double duty in your risk picture: it is an outage risk, an electrocution risk, and an ignition risk on the same stem.

It is worth walking your line corridors as part of the same pass you make for defensible space. Our fire mitigation guide covers the zone work, and the hazardous fuel guide covers what counts as fuel. Note the one place the goals diverge: thinning around a line can leave a formerly sheltered tree newly wind-exposed, and newly exposed trees fail at elevated rates in their first seasons. That belongs in the plan, not in next winter’s surprise.

What we can and cannot do

Worth being direct about scope, because plenty of operators are not.

Canyon Cutters is not a line-clearance contractor. Work inside the ten-foot minimum approach distance to an energized conductor requires qualified line-clearance tree trimmers, specific training, and insulated tooling. That is a distinct trade, and the honest answer when a job needs it is that it belongs to the utility or to a line-clearance crew.

What we do handle:

• Everything outside that distance— the removals, thinning, and structural pruning on the rest of your property.
• Work on a de-energized service drop, once the utility has provided the temporary disconnect described above. This is the common case and it is very solvable.
• Telling you which bucket a given tree falls in during a walkthrough, before anybody quotes it.
• Storm cleanup once the utility has released the site.
• Planting-location advice so the next generation of trees is not under a conductor.

If a quote arrives from anyone for pruning inside ten feet of a live line with no mention of a disconnect or a line-clearance qualification, treat it the way you would treat a roofer without insurance. Our guide to what ISA training actually changes covers how to read a crew’s credentials.

If you have a tree near a line and want a straight answer about who needs to handle it, reach out through our contact page or call (201) 960-8275. The first visit is free, and sometimes the most valuable outcome is us telling you to call the utility instead — which costs you nothing and is occasionally the entire job.

This article summarizes publicly available OSHA and Rocky Mountain Power guidance and is general information, not legal advice, an official utility policy statement, or a safety qualification. Utility programs, clearance standards, planting distances, and contact numbers change — and responsibility for a specific span on a specific property can only be confirmed by the utility. Verify with Rocky Mountain Power before acting. If a line is down or a tree is in contact with a conductor, call 911 and stay back.