Power Line Trimming

POWER LINE TRIMMING SALT LAKE CITY

Power line trimming is the work of cutting tree branches and brush back from energized electrical lines so limbs can’t contact the wires, knock out power, or start a fire.

In Utah that work gets split between the utility and the property owner, and most people guess wrong about which piece is theirs.

We’ve done power line trimming here since 1967, including contract work for Rocky Mountain Power, so this page lays out who handles what, why the clearance rules exist, and which trees on the Wasatch Front cause the most trouble.

Who Actually Handles Power Line Trimming, and Who Pays

The line running past your house isn’t one thing. There are three kinds, and each one comes with a different answer.

Transmission lines are the high-voltage lines carried on the big metal towers.

Distribution lines are the ones strung pole to pole through neighborhoods. Utilities are required to keep vegetation clear of both, so trees touching those main lines are the utility’s job, not yours.

In our service area that means Rocky Mountain Power. They run a year-round program, employ certified arborists to oversee it, and contract certified arborists to do the trimming. If a cottonwood in your parking strip is growing up into the distribution line overhead, that’s on them, and there’s usually no charge to you for the clearance work. LegalClarity + 2

The third line is the one people miss. The service drop is the single wire that runs from the pole to the connection on your house. Homeowners are typically responsible for trees near those lower-voltage lines that deliver power directly to the home. And here’s the other catch: if you want a tree pruned or removed for landscaping reasons rather than line clearance, Rocky Mountain Power won’t do it. You hire a private contractor. That’s where we come in.

One more thing worth knowing. Utah utilities have the right to access private property to trim or remove trees that threaten their lines, and if you let a tree become a hazard, the cost of emergency work can get passed back to you. They can trim on your property without your permission and without much notice. That’s not the utility being aggressive. It’s how they prevent the tree from taking down a whole neighborhood.

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The 10-foot rule, and Why We Don’t Hand a Homeowner a Pole Saw

There’s a hard line in this work, and it’s federal.

Line-clearance tree trimming means pruning or removing anything within 10 feet of energized power lines.

Under ANSI Z133, only a qualified line-clearance tree trimmer, or a trainee under direct supervision, is allowed inside that 10-foot space on lines up to 50 kV, and the distance grows at higher voltages.

Anybody who isn’t qualified has to stay at least 10 feet back. That’s not a suggestion. It’s OSHA 1910.269 and it’s the same standard the utility’s own crews follow. Occupational Safety and Health Administration + 2.

Why so strict? Trees conduct electricity.

The human body gives the current a path to ground, and contact with an energized branch, tool, or piece of equipment can cause shock, injury, or death.

A branch that’s touching a line, or sitting inside that minimum approach distance, can only be removed with insulated equipment.

When our crews work close to voltage above 750 volts, a second line-clearance trimmer stays within voice range the entire time.

That’s the part a homeowner on a ladder with a hardware-store pruner has none of. No insulated tools, no backup, no training on step and touch potential.

The Trees That Cause Most of the Trouble in Utah

Not every tree is a line-clearance problem. The fast-growing species are, because they close the gap between a trim and the wire in a single season.

Cottonwood, Siberian elm, willow, and boxelder are the fast growers, and Utah utilities push their clearance out to roughly 14 feet for those, versus about 10 feet for slower species like spruce and oak.

Cottonwoods are the worst of it along the Wasatch Front. They were planted for shade all over the older Salt Lake Valley neighborhoods decades ago, they’re brittle, and a limb that looks solid can fail under wet snow with no warning.

Siberian elm is nearly as bad and it seeds itself into fence lines and utility corridors where nobody planted it on purpose. Boxelder does the same. Bountiful City

Then there’s the weather.

The valley catches canyon wind events that come through fast off the benches, and heavy October and November snow loads branches while the leaves are still on. Old wood, dense canopy, a line running through the crown. That combination is why tree contact is one of the leading causes of outages in Utah, especially during storms.

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When to Trim, and the Mistakes We Clean Up

The window matters. For most Utah species, late winter into early spring, before bud break and after the hard cold, is the right time to prune. Some ornamentals get pruned right after they bloom. Timing changes how fast the wound seals and how much regrowth you get.

That last part is where the biggest mistake shows up. People top a tree that’s growing under a line, thinking they’ve solved it.

Topping does the opposite. The tree responds by throwing up a mess of fast, weakly attached water sprouts, and those shoot straight back toward the wire faster than the original growth did.

Cutting to a proper lateral branch is what actually reduces the regrowth, and it doesn’t wreck the tree’s natural defenses the way topping does. Directional pruning, training the growth away from the line instead of hacking it flat, is the method that holds.

The other common error is planting the wrong tree in the wrong spot to begin with.

A species that grows over 25 feet needs to go at least 25 feet away from the line, and taller trees need more room than that.

Plant a big grower directly under a distribution line and you’ve signed up for years of the utility pruning it into a lopsided shape, because a V-notch or side-cut is the only way to keep it clear. People hate how those trees look. The shape was the tree’s fault, not the crew’s.

And the mistake that ends worst is a homeowner deciding to handle a line-adjacent limb themselves. An aluminum ladder against the house, a metal pole pruner, a branch that brushes the service drop. That’s the setup for an electrocution or a fire, and it happens.

What Ignoring it Actually Costs

The failure most people picture is a power outage, and that’s real.

The 2003 Northeast blackout that left more than 50 million people without power started when tree branches contacted a utility line in Ohio. One tree. Cascading failure.

But, the closer-to-home costs are the ones that hit your wallet. A tree that causes an outage can run a few hundred to several thousand dollars in repairs, and if a falling limb causes injury or property damage, you can be looking at a liability claim and a higher insurance premium. Fire is the other one. A branch arcing against a line in dry August wind is exactly how vegetation-caused wildfires start, which is why the whole vegetation-management program exists in the first place.

Working with Diamond Tree Experts

If a tree on your property is growing toward a line, near a service drop, or already touching one, don’t touch it and don’t let a lawn crew touch it either.

Call the utility first for anything near the primary distribution or transmission lines, since that’s their work and usually their cost.

For the service drop, for landscaping-driven pruning, or for a hazard tree that needs to come down near a line, that’s ours.

We’ve worked these neighborhoods, these species, and these soil and wind conditions for 57 years.

Our arborists are ISA-certified and trained for work around energized lines, not just laborers with a saw. We’ll come out, look at the actual tree, tell you straight which part is the utility’s problem and which part is yours, and give you a real number for the work.

Serving Salt Lake, Davis, Utah, and Weber counties across the Wasatch Front.

Frequently Asked Questions

Who Is Responsible For Trimming Trees Near Power Lines In Utah?
In Utah, the utility handles trees near the main distribution and transmission lines, and the property owner is usually responsible for trees near the service drop running from the pole to the house. While utility companies like Rocky Mountain Power trim or remove trees that interfere with high-voltage lines, homeowners are typically responsible for trees near the lower-voltage lines that feed power directly to the home. Landscaping trims are also on you. If you want a tree pruned or removed for appearance rather than line clearance, Rocky Mountain Power won’t do it, and you’ll need a private contractor. Allwoodstreeservice Rocky Mountain Power

How Close Can A Tree Be To A Power Line?
Branches should stay well back from the wire, and Utah utilities enforce that with clearance distances tied to how fast the tree grows. Around neighborhood distribution lines, slower species like spruce and oak get at least 10 feet of clearance, while fast growers like willow, Siberian elm, cottonwood, and boxelder get pushed out to around 14 feet. For planting, keep the future size in mind. A tree that will grow over 25 feet tall should be planted at least 25 feet away from the line, and taller species need even more room. Bountiful City Reliable Tree Care

Can I Trim A Tree Near A Power Line Myself?
No. Tree branches conduct electricity, and contact with an energized line through a limb, a metal ladder, or a pole pruner can cause serious injury or death. Federal safety standards under ANSI Z133 only allow qualified line-clearance tree trimmers, or trainees under direct supervision, to work within 10 feet of energized lines up to 50 kV. Anyone who isn’t qualified has to stay at least 10 feet back. This is the one part of tree care where doing it yourself isn’t a cost decision, it’s a safety line.

Does Rocky Mountain Power Trim Trees For Free?
Yes, when the trimming is for clearance around their own lines. Rocky Mountain Power runs a year-round vegetation program, uses certified arborists to oversee it, and contracts certified arborists to do the pruning. That work comes at no charge to you. What they won’t cover is anything driven by your landscaping, or clearing around the service drop when that portion is the homeowner’s responsibility.

Can The Power Company Come Onto My Property To Trim My Trees?
Yes. Utility companies in northern Utah have the right to trim trees on private property that threaten their lines, and they can do it without your permission and without advance notice. If you let a tree become a hazard, the cost of emergency work can also be passed back to you. They do this to prevent a single tree from causing an outage or a fire across a whole neighborhood.

What Happens If Trees Near Power Lines Aren’t Trimmed?
Untrimmed trees near power lines cause outages, fires, and liability. The 2003 Northeast blackout that left more than 50 million people without power started when tree branches contacted a utility line. Closer to home, a tree that causes an outage can run from a few hundred to several thousand dollars in repairs, and a falling limb that injures someone or damages property can lead to a claim and a higher insurance premium. In dry Utah wind, a branch arcing against a line is also a wildfire risk.

Who Do I Call If A Tree Is Touching A Power Line?
Call the utility, not a tree service, if the tree is touching or hanging into a primary distribution or transmission line, and never touch a downed line yourself. If a city tree is down on a line after a storm, call public works, and either way, only trained crews should handle it. For a tree near your service drop, a landscaping-driven trim, or a hazard tree that needs removal near a line, call us at Diamond Tree Experts and we’ll tell you which part is the utility’s and which part is ours.