Pacific Northwest Chapter of the International Society of Arboriculture

The Pacific Northwest Chapter of the International Society of Arboriculture (PNW-ISA) is a member organization for arborists and urban foresters. We bring together professionals from Alaska, Idaho, Oregon, Washington, and British Columbia. Since 1979, we have been a resource and advocate for the green industry. Our mission is to foster a greater appreciation of trees and promote the professional practice of arboriculture through education, research, and technology. We pride ourselves on being the premier source for information about proper tree care in the Pacific Northwest. Reaching out to both professionals and the general public, we dispel myths about tree care and encourage best practices in the field. ISA Certification Programs are the gold standard for working arborists. Through our work on certification and continuing education, we foster professional growth and connect green industry businesses with qualified tree experts.