
Certification Levels
Which certification is right for you?
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Certified Arborist Level
This is the largest group of credential holders. These professionals have a minimum of three years experience in some aspect of tree care and have passed an exam developed by an international panel of experts. The exam extensively covers every aspect of tree care and the individuals must have an acceptable level of knowledge in all areas of arboriculture.
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Certified Tree Worker Climber Specialist
These credential holders have a minimum of 18 months experience professionally climbing trees in a safe and efficient manner to perform tree care. They have knowledge in the major aspects involved in tree care including: pruning, removal, cabling and safety. They must pass a knowledge exam and a skills exam conducted by trained evaluators.
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Certified Tree Worker Aerial Lift Specialist
These credential holders have a minimum of 18 months experience professionally climbing trees in a safe and efficient manner to perform tree care. They have knowledge in the major aspects involved in tree care including: pruning, removal, cabling and safety. They must pass a knowledge exam and a skills exam conducted by trained evaluators.
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Certified Arborist Municipal Specialist Level
This certification is for professional arborists who are ISA Certified Arborists in good standing and have additional experience in the specialty area of urban trees. The municipal specialists work for cities and states, parks, contractors or consultants. One of the certification objectives is to provide the public and those in government with a means to identify those professionals who have demonstrated, through a professionally developed exam and education program, that they have a thorough knowledge of establishing and maintaining trees in a community.
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Certified Arborist Utility Specialist
This certification is for professional arborists who are ISA Certified Arborists in good standing and have additional experience in the specialty area of tree care around power lines. The utility specialists work for utility companies and their contractors or consultants. One of the certification objectives is to provide the public and those in government with a means to identify those professionals who have demonstrated, through a professionally developed exam and education program, that they have a thorough knowledge of line clearance vegetation management.
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Board Certified Master Arborist Level
This credential is designed for arborists who have reached the pinnacle of their profession. To sit for the exam, individuals must be a Certified Arborist in good standing and have obtained other prerequisites or "points" defined by ISA and obtained through measurable experience, formal education, related credentials, or professional experience. The computer-based exam covers science, practice and management.
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For more details on the ISA Certified Arborist program, visit the certification page at www.isa-arbor.com or contact the PNW-ISA at (503) 874-8263.

Which certification is right for you?