ISA and Western Chapter Merge Certified Tree Worker Programs
Western Chapter International Society of Arboriculture

CHAMPAIGN, Ill (September 17, 2015) – The International Society of Arboriculture (ISA) and the Western Chapter ISA (WCISA) are pleased to announce the merger of their Certified Tree Worker (CTW) programs. Both reputable service providers to the arborist community, the two organizations made the collaborative decision to combine forces in order to increase capacity and overall service while generating a larger global impact.

Western Chapter ISA will continue to offer its CTW course through the June of 2016; however, ISA looks forward to offering an internationally-recognized credential to certified tree workers in their region. “We are excited for the WCISA CTW merger with ISA,” states Rhonda Wood, Western Chapter ISA president. “The value of having our certifications align through the ISA allows our administration management team to spend that time on other chapter programming. This is a win-win for our members while placing the CTW in good hands with the ISA.”

Individuals who currently hold the Western Chapter tree worker certification will be transferred to the ISA Certified Tree Worker program in phases. Final transition and the official launch of the merged Certified Tree Worker program is targeted for June 2016. Both the Western Chapter and ISA are excited about the higher level of support and service the merger will bring to our credential holders. For questions regarding the merger of the Certified Tree Worker programs, contact isa@isa-arbor.com.

Download the press release here

Certified Tree Worker To be a ISA Certified Tree Worker Climber Specialist®, candidates must have the skill and endurance to climb trees, demonstrate high regard for safety, and be able to get the job done off the ground. This credential is different from the other certifications because you tested in both a classroom setting and a field setting. Candidates must have training in aerial rescue, CPR, and First Aid to obtain this certification.
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The ISA Certified Tree Worker Aerial Lift Specialist® certification requires candidates to demonstrate their ability to perform as a competent aerial lift operator. The knowledge gained with this certification can improve the productivity, quality of care, and safety practices of those who earn the credential. Along with proven knowledge of CPR and first aid, candidates have been tested on safety procedures, and must be able to complete thorough truck and tree inspection
English booklet
Spanish booklet
Online application

Certified Arborist
International Society of Arboriculture

Certified Arborist

The Arborist Certification Program is a voluntary effort among professionals in the tree care industry to establish a meaningful standard of quality in arboricultural work, to promote and encourage continuing education, and to provide the public with a mechanism for identifying qualified arborists.

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Continuing Education Units

Continuing Education

How to Apply for Continuing Education Units (CEU's) for Your Upcoming Program

The Western Chapter ISA has taken the responsibility of assigning continuing education hours (CEUs) for educational programs in the states of Arizona, California, Hawaii and Nevada. We would be pleased to assign CEU numbers to programs you present if they are applicable. Offering credit for your programs can make them more attractive to potential attendees and registrations may be increased.

Click here to download an application for continuing education units
Click here to download a blank CEU Sign in Sheet

Upcoming Exam Dates


2/9/2018 - CA Only - Las Vegas, NV - Arborist Only

As of 7/1/2016 – Certified Tree Worker Exams will be administered through ISA. Please use the ISA application forms for exams after 7/1/16.