The Pacific Northwest Chapter of the International Society of Arboriculture

Certification

THE ISA CERTIFICATION PYRAMID AT A GLANCE

The ISA Certification pyramid builds upon a strong base of knowledge required to obtain each credential, defining a career path in arboriculture through the certification programs.

Explore the types of certification available to learn which suits your needs. More information about becoming certified may be found here.

The International Society of Arboriculture works hard with its members to keep improving the standards of professional tree care. Certification by the ISA is an important commitment to ethical tree care practices and lifelong learning to build knowledge and skills. The work required to become certified and maintain certification is an indication of professionalism and a desire to maintain high industry standards.

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How to Become Certified

Certification demonstrates a commitment to continuing professional and technical development, as well as ethical workplace practices, that supports a high level of professionalism in the tree care industry which benefits all certified tree care workers.

Maintaining Certification

To maintain the certification, a recertification fee must be paid and a minimum of 30 continuing education units (CEUs) must be achieved by the end of the three-year period.

ISA Code of Ethics

ISA Members will...

Credentials

Find out about both ISA credentials and Affiliated Profession credentials here.

information about becoming a proctor
eligibility and contact information to request an application

PNW-ISA Tree ID Lists for the Certified Arborist Exams

ISA Certified Arborist Exams

The Certified Arborist exam is a written test consisting of 200 multiple-choice questions. The exams listed in this section are administered by the PNW-ISA. The Certified Arborist exam costs US $150 for members of both the ISA and the PNW-ISA and US $250 for non-members or those who hold membership in only one of the organizations.

ISA Certified Tree Worker Exams

The Certified Tree Worker exam consists of a 50 question multiple-choice written test and a climbing skills test. The Certified Tree Worker exam costs $115 for ISA and PNW-ISA members and $165 for non-members or members of only one organization.

Certification