California Arborist Association


Links for Certification, resource materials, educational workshops and classes. Check also with your local college or university's horticulture or arboriculture departments.

For Certification and Arborist Resources:

ISA - International Society of Arboriculture
For information on becoming a Certified Arborist, or call 1-888-472-TREE (8733) for an informational packet.
Click for ISA

WCISA - Western Chapter of the ISA
For information on how to become a Certified Tree Worker and upcoming events. ALSO information for Women Climbers. The Western Chapter of the ISA includes CA, HI, NV, AZ. Call 1-714-639-3610 for an informational packet.
Click for WCISA Website

ASCA - American Society of Consulting Arborists
For information on becoming a Registered Consultant. You may call 1-301-947-0483 for a packet.
Click for ASCA

TCIA - Tree Care Industry Association.
For information on TCIA’s Certified Treecare Safety Professional or business Accreditation programs, visit or call 800.733.2622.
Click for TCIA Website

Urban Forests Council
has a Certified Urban Forester Examination. Click for Urban Forest Council website
Other Related Organizations:

American National Standards Institute at

Britton Fund (The), non-profit corporation works to promote research and educational opportunities in the field of arboriculture.

California Department of Forestry & Fire Protection at

California Landscape Contractors Association at or 916-830-2780.

California Oak Foundation at or 510-763-0282.

California Urban Forests Council at or 415-408-3222.

Canopy at or 650-964-6110. Subscribe to TreE-News with a request to

Contractors State Licensing Board (California) at

Department of Industrial Relations (California),

Professional Tree Care Association of San Diego at or 619-443-6202.

Shigo books and materials: Judy Shigo, Shigo and Trees, Associates LLC, P.O. Box 2466, Snohomish, WA 98291-2466. Phone 360-862-1869, Fax 360-862-8490. Email:

Street Tree Seminar of Southern California at or 714-639-6516.

United States Occupational Safety and Health Administration,

University of California Cooperative Extension at

For more information contact the California Arborists Association at:

The California Arborists Association
P.O. Box 3416
Napa, CA 94558

Phone/Fax: (707) 224-8269

Web Page Editor: Fran Gardner,


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