A hazardous tree is a ticking clock. Our ISA-certified arborists identify structural defects, disease, and instability before disaster strikes — then remove the risk safely and efficiently.
A hazard tree is any tree that poses a measurable risk of failure — meaning the tree or part of it could fall and strike a person, structure, vehicle, or utility line. Hazard removal is the proactive identification and elimination of these risks before they become disasters.
Unlike routine tree removal (where a healthy tree is simply unwanted), hazard removal requires a trained eye. Many of the most dangerous trees look perfectly healthy from the outside — structural decay is internal, root failures happen below grade, and disease can compromise a tree's integrity for years before it becomes visible.
At AGS, every hazard removal starts with a certified arborist assessment. We don't guess — we evaluate, document, and recommend based on ISA Tree Risk Assessment Qualification (TRAQ) standards. If we say a tree is hazardous, we back it up in writing.
ISA TRAQ Standards
We Assess Before We Remove — Always in WritingWe use the ISA Tree Risk Assessment methodology — a standardized framework that combines likelihood of failure with consequence to life and property.
Six categories account for the vast majority of tree failure events we assess and remove.
Fungal pathogens hollow out the heartwood while the outer bark remains intact. A tree can look healthy while 70%+ of its structural wood has rotted away.
Construction damage, soil compaction, flooding, and girdling roots can fatally compromise the anchor system — often with no visible crown symptoms until imminent failure.
Two or more equally sized stems growing from one point create a weak, included-bark union. High wind or ice loading causes these to split violently, often taking down structures.
Emerald ash borer, bark beetles, and wood-boring insects destroy vascular tissue and structural wood — killing trees within seasons and leaving brittle standing snags.
An asymmetric crown or sudden lean shifts the center of gravity beyond the root plate's ability to compensate — especially dangerous on slopes and near structures.
Lightning can travel through a tree's cambium layer, vaporizing water and splitting wood from the inside. Struck trees often appear viable but are structurally compromised.
Every hazard job follows our five-step protocol — from first assessment to final cleanup.
Our arborist conducts a full crown-to-root visual assessment — looking for canopy dieback, bark anomalies, fungal growth, soil heaving, and lean changes.
Where visual inspection isn't enough, we use mallet sounding and resistance drilling to evaluate internal wood density and locate hidden decay pockets.
We assign a formal risk rating and provide a written report with findings, photos, recommendations, and urgency timeline — useful for insurance, legal, and HOA documentation.
For confirmed hazard trees, we design the removal sequence — rigging, drop zones, property protection — before touching the tree.
Sectional removal with proper rigging, full debris chipping, and site cleanup. We leave the area clear and safe — ready for replanting or landscaping.
Tools used in hazard assessment
Any property with mature trees carries some level of risk. These situations call for a professional hazard assessment now.
Trees 30+ years old have had decades to develop internal decay, root conflicts, and structural defects. A periodic hazard assessment is part of responsible homeownership.
Shared tree canopy means shared liability. HOAs have a duty to maintain trees in common areas — an unaddressed hazard tree can mean significant legal exposure.
Parking lots, walkways, and high-traffic areas near trees create liability concentrations. Commercial property managers should have trees assessed annually.
Root zone compaction, grade changes, and utility trench cuts during construction can kill trees within 3–5 years — creating hazardous standing snags that weren't there at completion.
Trees growing into or leaning toward electrical infrastructure require specialized hazard management — combining arborist expertise with utility coordination protocols.
High-occupancy spaces under tree canopy carry the highest consequence ratings under ISA risk methodology — requiring the most rigorous and frequent hazard evaluation.
Property owners can be held liable for damages caused by trees they knew or should have known were hazardous. Here's what you need to understand.
Courts evaluate whether a reasonable property owner, using ordinary care, would have identified the hazard. An ISA assessment creates a documented record of your due diligence.
If a neighbor's healthy tree falls on your property in a storm, they're typically not liable. If the tree was visibly dead or diseased, liability may shift — documentation matters on both sides.
Property managers and HOAs have a duty of care to maintain trees in common areas. Failure to address known hazards — especially after a complaint — creates significant legal exposure.
Some insurance carriers now request proof of tree maintenance and hazard assessments as part of policy renewals. A written AGS assessment report can satisfy this requirement.
Some cities require permits before removing hazard trees, even on private property. Our team coordinates with local municipal requirements so you stay compliant throughout the process.
A written hazard assessment from an ISA-certified arborist is your most powerful documentation tool — for insurance, legal, and peace-of-mind purposes.
Walk your property and look for these indicators. Any one of them warrants a professional assessment.
Fungal fruiting bodies are the visible sign of advanced internal decay. By the time you see them, the internal wood damage is already severe.
Raised or cracked soil on one side of the trunk indicates the root plate is lifting — the tree is already beginning to fail.
Significant dead branches in the upper crown signal that the tree's vascular system is failing. Mass dieback accelerates quickly.
A dull, hollow sound when you tap the trunk with a mallet or your fist suggests internal decay cavities that compromise structural strength.
Clusters of small shoots sprouting from the trunk or major roots are a stress response — the tree is trying to compensate for crown decline or root damage.
Deep vertical cracks, seams in the bark, or large sections of missing bark expose the tree to infection and indicate previous structural failure events.
Don't wait for confirmation from a storm. Our ISA-certified arborists provide free hazard assessments across all service areas — with a written report included.
Everything you need to know before scheduling a hazard tree assessment.
Age alone doesn't make a tree hazardous. A 200-year-old live oak can be perfectly sound. Hazard designation comes from structural defects, disease, decay, or site conditions that create actual failure risk. That's exactly why an ISA-certified assessment matters — it replaces guesswork with documented evidence.
Sometimes, yes. Crown reduction, cabling and bracing, or removing defective limbs can reduce risk to an acceptable level. We always explore mitigation options before recommending full removal — especially for high-value specimen trees. Our written report will outline all options.
Our written report includes: tree species and location, observed defects with photos, ISA risk rating (low/moderate/high/critical), likelihood of failure estimate, consequence zone (what would be struck), and our recommended action with urgency timeline. It's formatted for insurance and legal use.
Potentially, if you can prove they knew or should have known the tree was hazardous. A written notification to your neighbor (and documentation of their response) is important. We can provide a formal assessment report for this purpose. Consult a property attorney for specific legal advice.
It varies by municipality. Many cities expedite or waive permit requirements for documented hazard trees. We check local regulations for every job and handle permit coordination when needed — so you're never delayed by paperwork on a safety issue.
For most residential properties with mature trees, a full assessment every 3–5 years is appropriate. After major storms, construction nearby, drought stress, or pest outbreaks, an interim assessment is warranted. High-risk sites (schools, commercial properties, HOAs) should assess annually.
A free ISA-certified assessment is the first step. Call the line closest to you and we'll schedule an on-site visit.
The arborist found decay in two trees I thought were completely healthy. The written report they gave me was professional and detailed — my insurance agent was impressed.
I had a feeling one of my oaks wasn't right. AGS confirmed it had severe internal rot and gave me a clear explanation and report. Removal was clean and fast.
Our HOA hired AGS to assess all 60+ trees in the community. They gave us a prioritized report and removed the critical-risk ones the same week. Very organized team.
Neighbor's tree was leaning toward my house after a storm. AGS assessed it, wrote up a formal report, and I sent it to my neighbor. Tree was removed within a week.
They talked me out of removing a tree I thought was dying — said it just needed treatment. Saved me $800 and the tree is thriving now. Honest professionals.
The arborist found decay in two trees I thought were completely healthy. The written report they gave me was professional and detailed — my insurance agent was impressed.
I had a feeling one of my oaks wasn't right. AGS confirmed it had severe internal rot and gave me a clear explanation and report. Removal was clean and fast.
Our HOA hired AGS to assess all 60+ trees in the community. They gave us a prioritized report and removed the critical-risk ones the same week. Very organized team.
Neighbor's tree was leaning toward my house after a storm. AGS assessed it, wrote up a formal report, and I sent it to my neighbor. Tree was removed within a week.
They talked me out of removing a tree I thought was dying — said it just needed treatment. Saved me $800 and the tree is thriving now. Honest professionals.
Schedule your free ISA-certified hazard assessment today. We'll evaluate your trees, provide a written report, and recommend exactly what needs to be done — and when.