ANSI Z133 – 2012 Safety Requirements


The American National Standard for Arboricultural Operations – Safety Requirements, or ANSI Z133.1 • 2012, 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.

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.