Certified Arborists

A Certified Arborist is someone who has passed a certification exam from the International Society of Arboriculture and has three years of experience. Using a Certified Arborist is one way to help ensure appropriate care for your trees, though even certification is no guarantee of proper service. It is also helpful to obtain recommendations and interview several arborists.

The Pacific Northwest Chapter of
the International Society of Arboriculture

PNW-ISA is a nonprofit organization dedicated to promoting proper tree care in the Northwest. The PNW-ISA is a Chapter of the International Society of Arboriculture, encompassing the states of Washington, Oregon, Idaho, Alaska, and the province of British Columbia.

Certified Arborists List - Commercial Tree Care