ANSI Z133 Safety Standard - 2026

The ANSI Z133 standards are the accepted industry safety standards for tree care work, and are essential to read and implement to run a safe tree care business. Newly updated in 2026.

The ANSI Safety Requirements for Arboricultural Operations have been updated to the ANSI Z133-2017 with input from industry professionals. Compliance with the Z133 standard is voluntary, but OSHA may cite a section of the Z133 when they can't find language in OSHA standards.

The Z133 is a helpful guide to General Safety, Electrical Hazard, Use of Vehicles and Mobile Equipment, Portable Power Hand Tools, Hand Tools and Ladders, and Work Procedures. Also includes glossary, log weight chart, aerial rescue workflow, and other useful appendices.

The American National Standard: Safety and Health Requirements for Arboricultural Operations (commonly referred to as the Z133 standard) is a United States safety standard for use across the arboriculture industry. The previous edition of the Z133, effective until 27 May 2026, was published in 2017. Since that year, the Z133 Committee has drafted revisions to refine the standard, ensure better safety outcomes, and keep pace with developments in the industry.