The Homeowners Column

Westchester Tree Life are proudly certified arborists of the International Society of Arboriculture ! The International Society of Arbiculture promotes the professional practice of arboriculture through research, technology, and education.


The ISA also fosters a greater worldwide awareness of the benefits of trees! Additionally, most cities in Minnesota require arborists to be licensed by the respective city if the company wishes to perform tree work within the city limits.

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Licensing only means that the various tree care companies have paid an annual licensing fee and have shown proof of insurance.

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Licensing in Minnesota does not imply proficiency.


To that end, many communities are requiring that tree care companies working on publicly-owned trees employ ISA Certified Arborists in addition to registering with the community as a licensed tree care company.

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An arborist is an individual who is trained in the science of plants, especially trees, as well as how to care for, plant and maintain them.

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ISA arborist certification is a voluntary process to document knowledge of trees and their care.

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This certification is not mandated by law and is self-regulated by the administration of the International Society of Arboriculture.

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This provides a measurable assessment of knowledge and competence in the care of trees.

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Ian Brown is an Urban Forestry Technical Services Manager and ISA Certified Arborist/Municipal Specialist for the City of Milwaukee, and Eric Petersen is also a trained Urban Forestry specialist and is the president of the Wisconsin Arborist Association (WAA).

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