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Tree Risk Assessment

A Tree Risk Assessment is a systematic and thorough process used to identify, analyze and evaluate tree risk. By looking beyond the obvious, a specially trained arborist can determine what level of risk your tree poses now, and in the future.

The International Society of Arboriculture has developed a detail focused, procedure-oriented approach to assign each tree assessed a level of risk. This multi-point process ensures no detail is overlooked. Our expert tree service is fully ISA certified and equipped to provide a full service risk assessment. 

About The Assessment


Who should get a Tree Risk Assessment?

Are you worried your tree may be dead or dying? Is it beginning to lean toward your home or business? 

If you suspect your tree may be in declining health or is becoming unsafe, a qualified Arborist can inspect the tree and give you precise details regarding its current and future risk level.


What does a Tree Risk Assessment tell me?

There are three levels of a Tree Risk Assessment, discussed below. A Certified Arborist will spend time gathering as much information as possible.

A visual assessment can be used to pick out problematic trees, a basic assessment will detect structural and stability related issues, and an advanced assessment will measure decay throughout the tree.


What steps should I take after the Assessment is complete?

The information gathered from the Tree Risk Assessment will be presented along with recommendations on how to keep your property safe.

You will be given a detailed report and all the knowledge you need to make an informed decision. If the tree is relatively stable you may decide to wait before removing it, if not, the Arborist can present you with options for safe tree removal.

Tree Risk Assessment Levels


Limited Visual Assessment

• In a Limited Visual Assessment, a Certified Arborist will look at a large population of trees to determine which, if any, pose imminent risk. 

• After identifying which trees pose the highest level of risk, a recommendation will be made regarding which trees require a level two or three assessment. 


Basic Assessment

• A level two, or basic assessment, is a detailed inspection of a tree and its surrounding site. This inspection is multi-faceted and includes the use of mallets, probes, hypsometers and other instruments to gather as much information as possible.

• The data gathered from this inspection is then analyzed using the ISA Risk Matrix to assign a Risk Rating.


Advanced Assessment

• Advanced Assessments are performed to provide detailed information about specific tree parts, defects, targets or site conditions. 

• An Advanced Assessment is used when a level two assessment identifies a serious defect in the tree. At this level a Resistograph Drill is used to safely measure the decay within the trunk, root flare or branches. 

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