A tree touching a power line is not a yard maintenance problem. It is an electrical hazard that can kill, start a fire, or knock out power to a neighborhood. In San Diego, SDG&E maintains clearance around its high-voltage distribution and transmission lines on a regular cycle, but the homeowner carries responsibility for vegetation around the service drop, the lower-voltage line that runs from the utility pole to the house. Under Cal/OSHA regulations, anyone working within 10 feet of an energized overhead conductor must hold a qualified line-clearance tree worker certification. A general landscaper does not have that credential, and neither does a homeowner with a pole pruner. The dangers are real: contact with an energized line can cause electrocution, arc flash, or ignite vegetation in seconds.
Who is responsible for trees near power lines in San Diego?
The short answer: it depends on which line the tree is touching.
SDG&E owns and maintains the primary distribution and transmission lines, which run at higher voltages between utility poles and along major corridors. The utility has a vegetation management program that trims or removes trees threatening those conductors. If a tree on your property is growing into primary distribution lines, you can report it to SDG&E and they will typically schedule their line-clearance contractor to address it. Call their line before you touch anything.
The service drop is different. That is the lower wire running from the transformer on the pole directly to the weatherhead on your house. SDG&E owns the line itself, but the homeowner is responsible for keeping vegetation clear of it. If an overhanging branch from your Canary Island pine is rubbing against your service drop, that is your tree and your problem to solve. The same goes for any private trees on your property that brush against secondary conductors on private lines.
When you are not sure which line is which, call SDG&E at 1-800-411-7343. They can tell you exactly which conductors are on the pole and who is responsible for clearing adjacent vegetation. Do not guess.
Why you can’t trim a tree near a power line yourself
California law backs up what common sense already says here.
Cal/OSHA Title 8, Section 2946 requires that any person working within 10 feet of an energized overhead electrical conductor be a qualified line-clearance tree worker. That designation requires documented training in electrical hazard recognition and specific personal protective equipment. It is not a license most arborists carry automatically, and it is not something a homeowner can claim by putting on rubber-soled boots.
The physics of the hazard are unforgiving. An energized distribution line can arc to a grounded object, including a tree branch or a metal ladder, before there is direct contact. Current does not need to go through the wire to reach you. It can jump several inches, and at distribution voltages, that jump is lethal. Add a wet branch, a metal chainsaw, or a ladder resting against a trunk, and the risk compounds fast.
For professional tree trimming work near lines, the qualified crew will assess whether the line needs to be de-energized before work begins. For high-voltage transmission lines, de-energization is almost always required. That coordination happens between the tree company and SDG&E directly. Homeowners do not arrange it. The crew does.
How close is too close? Safe clearance distances for trees and power lines
There is no single universal rule, because clearance requirements vary by voltage, jurisdiction, and the type of conductor. But some practical benchmarks apply across San Diego County.
SDG&E’s vegetation management program targets a minimum clearance of roughly 4 feet around its distribution lines during trimming cycles, though the actual target depends on expected tree growth rate until the next cycle. The goal is to maintain safe clearance over time, not just at the moment of trimming.
For homeowners thinking about planting near existing lines, the practical rule is simpler: keep mature tree height under the height of the lowest conductor, with enough margin to account for storm movement and branch flex. A tree that reaches 15 feet at maturity planted below a line that runs at 20 feet is manageable. A coast live oak that reaches 50 feet planted below that same line is a future problem.
If you are not sure whether a tree on your property has grown too close, a qualified arborist can assess it. Crews in the Branch Pro network regularly evaluate trees in proximity to conductors and can advise whether trimming is sufficient or whether removal makes more sense long-term. See our guide to tree removal for situations where trimming is no longer the right answer.
What to do if a tree falls on or touches a power line
Treat every downed or contact line as energized. Always.
A line can appear dead and still carry current. SDG&E may not have de-energized it yet, or it may be back-fed from another source. Ground gradient, where current travels through the soil outward from a downed line, can extend 35 feet or more from the point of contact. Stay back at least 35 feet and keep others back.
The sequence:
- Call 911 if there is any immediate danger to people or structures.
- Call SDG&E at 1-800-411-7343 to report the downed or contact line. They dispatch crews 24 hours a day.
- Do not approach the tree, touch the wire, or attempt to move anything until SDG&E confirms the line is de-energized.
- Once the line is cleared, contact an emergency tree service for the tree work. Utilities clear the electrical hazard. They do not remove the tree.
At Branch Pro San Diego, we connect you with line-clearance-qualified crews available 24/7 across San Diego County for the tree work that follows utility clearance.
Santa Ana winds, PSPS shutoffs, and fire risk from trees in power lines
Wind-driven contact between trees and power lines is one of the leading causes of wildfire ignition in Southern California. During Santa Ana events, branches that normally clear a conductor by several feet can swing into direct contact and either arc or snap a line. The ignition risk is highest when humidity is lowest, which is exactly when Santa Anas arrive.
SDG&E’s Public Safety Power Shutoff program exists partly because of this. When fire weather conditions reach a certain threshold, including wind speed, low humidity, and dry fuel conditions, SDG&E may proactively de-energize distribution lines in high-risk areas to prevent ignition. If you live in a PSPS zone in areas like Ramona, Alpine, Lakeside, or portions of North County’s inland communities, trees in proximity to lines on your property are a direct variable in how SDG&E assesses that risk.
Trimming trees back from your service drop and from secondary lines before wind season reduces that risk. It also reduces the chance that a branch failure during a Santa Ana event creates the kind of emergency that requires immediate response in conditions where every tree crew in the county is already busy. Our post on Santa Ana wind tree prep covers the full pre-season checklist.
If you are in a high fire-risk zone, the guidance in our fire-safe tree trimming checklist applies directly here too.
Best trees to plant under or near power lines in San Diego
The simplest rule: plant small under low lines.
Trees that stay under 25 feet at maturity are the standard recommendation for planting beneath or near utility lines in San Diego. Some species that work well in the county’s climate include:
Crape myrtle tops most lists for this situation. It maxes out at 15 to 25 feet depending on variety, handles drought once established, and has no tendency toward brittle branch structure. Texas mountain laurel is another compact, drought-tolerant option that stays under 15 feet and thrives in the county’s alkaline soils. Palo verde species, common in desert-adjacent neighborhoods of East County, grow 15 to 25 feet and are among the most fire-resistant options available.
Avoid fast-growing species with aggressive root systems or branch structure prone to wind failure. Eucalyptus, Canary Island pines, and any species that regularly tops 40 feet should be planted well clear of lines, where they have room to grow without creating future conflicts.
For a full look at low-water species that work across San Diego County micro-climates, see our guide to drought-tolerant trees for San Diego.
What to expect when you hire a pro for line-adjacent tree work
Pricing for tree work near power lines varies more than almost any other tree job, for a few honest reasons.
First, does the line need to be de-energized? If the work requires SDG&E to cut power temporarily, the crew has to coordinate that process and schedule around the utility’s availability. That adds time and sometimes cost.
Second, what is the access situation? A bucket truck or aerial lift can often reach a branch near a line from the street side without anyone climbing near the conductor. If access requires setting a crane in a tight residential yard, or if the terrain prevents aerial equipment from getting close, the complexity and cost go up.
Third, how much of the tree needs to be addressed? A single overhanging limb is a different scope than a 40-year-old ficus that has grown into three separate conductors from two directions.
A qualified crew will assess all of this before quoting. Ask specifically whether they hold line-clearance tree worker credentials, and ask whether they have worked with SDG&E before on de-energization requests. Both are reasonable questions and any qualified contractor will have direct answers.
The Branch Pro San Diego service area hub lists the communities we cover. For urgent situations, emergency tree service is available around the clock.
Frequently asked questions
Who do I call if a tree is touching a power line in San Diego?
Call SDG&E at 1-800-411-7343 first, and call 911 if there is immediate danger to people or structures. SDG&E will send a crew to assess and de-energize the line if needed. Once the electrical hazard is cleared, contact a qualified tree service to remove or trim the tree. Do not approach the tree or the wire before SDG&E confirms the line is safe.
Will SDG&E trim my tree for free?
SDG&E will trim vegetation threatening their primary distribution and transmission lines at no direct charge to the homeowner, as part of their ongoing vegetation management program. They will not trim trees simply because the homeowner wants them cleared, and they do not handle vegetation management for the service drop or for private trees that do not threaten primary conductors. If you are unsure whether your situation qualifies, call SDG&E to confirm before scheduling a private tree crew.
How far should a tree be planted from power lines?
A practical rule for San Diego is to choose a species that matures under the height of the lowest conductor, with at least a few feet of margin for storm movement and branch flex. For residential distribution lines, that typically means species that top out under 25 feet. For transmission corridors with taller structures, even that may not be enough clearance. Check with SDG&E or a qualified arborist before planting any large-canopy species near existing lines.
Is it illegal to trim a tree near a power line in California?
Not illegal for homeowners in general, but Cal/OSHA prohibits anyone from working within 10 feet of an energized overhead conductor unless they are a qualified line-clearance tree worker. That means a homeowner with a pole pruner, or a general landscaper without line-clearance credentials, cannot legally do the work if the branch is within that 10-foot zone and the line is energized. Violation of Cal/OSHA standards can result in fines, and more practically, the risk of electrocution is serious.
What happens during a PSPS and how do trees cause it?
A Public Safety Power Shutoff is a proactive de-energization that SDG&E initiates when fire weather conditions reach dangerous thresholds. Trees contribute to PSPS risk in two ways: overgrown vegetation near lines increases the ignition risk that SDG&E is trying to manage, and trees in direct proximity to conductors in fire-prone areas are a core factor in the utility’s risk modeling for which circuits to shut down. Keeping trees trimmed back from lines does not guarantee your circuit stays on during a PSPS event, but dense vegetation crowding lines in high-risk zones is exactly what the program was designed to address.
Can a regular arborist handle a tree near power lines?
It depends on the proximity. An arborist can assess a tree near lines and can perform work that does not require entering the 10-foot exclusion zone. For work within that zone, the arborist or a member of their crew must hold a qualified line-clearance tree worker credential. Ask before you hire. If a contractor offers to trim a branch directly adjacent to an energized line without mentioning line-clearance qualifications, that is a warning sign worth taking seriously.