Become a Member

Your membership pays itself back through discounts on products, access to exclusive resources, and educational opportunities.
Become a Member

Attend an Event

We promote safety in all that we do. MAC-ISA provides a huge array of educational events. Click below to view all the upcoming events.
Register Online

Become Certified

Want to become a Certified Arborist or Tree Worker? Find out which of the ISA certification credentials best meet your needs.
Become Certified

Who We Are

The MAC-ISA is a trade association for arborists, urban foresters, and others involved in the caring of trees. Our mission is "to promote a culture of safety while fostering education and research that supports the care and benefits of trees." The chapter area includes District of Columbia, Maryland, Virginia and West Virginia.

Regional Map

News & Announcements


Our TCC will take place April 14 and 15 at American University in Washington, DC. For more information go to our TCC events page.

2018 MAC-ISA Annual Meeting

2018 MAC-ISA Annual Meeting will held October 8-9 in Frederick, MD. We are looking for volunteers to help plan the meeting. For more information on the event and to register, go to our Annual Meeting events page.

Registration Open for Many Events

Registration is available for our Certification courses and TRAQ courses and TRAQ renewal courses.

Bonnie Appleton Memorial Fund Update

We have REACHED OUR initial FUNDRAISING GOAL OF $100,000 to endow this scholarship! Thanks to all who contributed. Scholarship applications are now accepted by the TREE Fund. We will continue to fundraise to increase the amount of future scholarships.  Please donate. Read more on the Tree Fund page under the Bonnie Appleton Fund section.


Safety Tips

Helmet Safety
Always wear a helmet with your chin strap buckled.
Risk Assessment
Perform a level 2 risk assessment before your climb.
Climbing Safety
Always stay on rope.
Utility Lines
Assume that all utility lines are energized.
Stay Alert
Stay alert at all times.
Protect Crew & Public
Establish a clear work zone and drop zone.
PPE Safety
Inspect and clean your PPE regularly.
Emergency Response Plan
Establish an emergency response plan prior to work.
Check Before Working
Check your equipment, surroundings and yourself prior to everyone's job.
Maintain the 4 A's
Maintain the 4 A's:  Attitude-Awareness-Action-Accountability
Command & Response
Use command and response.
Report Unsafe Behavior
Do not accept unsafe behavior (if you see something, say something).

Attend An Event

We promote safety in all that we do. MAC-ISA provides a huge array of educational events. Register for one of our events today!

Tree Fund
International Society of Arboriculture
Trees Are Good