Regulatory Compliance


OSHA is the federal agency charged with the enforcement of safety and health legislation.Find resources to meet OSHA regulations.


The U.S. Department of Transportation (DOT) oversees federal highway, air, railroad, and maritime and other transportation administration functions. Find resources to meet DOT regulations.


The American National Standard for Arboricultural Operations - Safety Requirements, or ANSI Z133.1 – 20xx, is developed by the Accredited Standards Committee (ASC) Z133. It is a comprehensive safety standard written by arborists for the arboriculture profession. It applies to employers and employees engaged in arboricultural operations.

ANSI Z133 is reviewed continually, and typically a revision is published every five to six years.

Although compliance with this standard is voluntary, Z133 carries the force of law in many instances in the U.S. When OSHA cannot find language in its own standards to guide safe work practices in a particular situation, they will typically cite a section of Z133 as what the employer, “…should have known or done” to create a safe work environment for its employees.

Copies of the most recent revision of Z133 may be purchased here. The standard is copyrighted and cannot be accessed or downloaded online.

Those affected by the standard are welcome to ask questions about its requirements or submit suggestions to ASC Z133 at any time. There is a form in the back of the printed standard for this purpose. Alternately, comments may be submitted in writing to any member of the committee or directly to the Secretariat of ASC Z133, the International Society of Arboriculture (ISA):

Janet Huber, Secretary, ASC Z133 Committee
c/o International Society of Arboriculture
P.O. Box 3129
Champaign, IL 61826
Fax: 217 355 9516

Peter Gerstenberger is TCIA's staff liaison to the ASC Z133 as well as its alternate representative. TCIA members should feel free to direct their questions, comments or concerns about the Z133 Standard to him at any time outside of a public comment period. Peter can be reached at 603-314-5380 x109 or through email. Official interpretations of the Standard's language can only be obtained through a written request to the ASC Z133 Chairperson and/or Secretariat (ISA).

Are you ANSI Compliant? Just ask! TCIA provides free safety/compliance consultation to TCIA members.  If you have questions relevant to ANSI A300, please ask!

Looking for information on TCIA’s Voice for Trees Political Action Committee, Action Alerts or Legislative Day on the Hill? Visit our Government Affairs page.