(510) 734-7123 bayarborist@gmail.com


ISA Certified Arborist #WE-3070A
CA Contractor License #794981
Arborist Reports and Consultations
ISA Tree Risk Assessment Qualified

Bay Arborist is a West Contra Costa County business based in El Sobrante.  Owner Tom Arrington has been an ISA (International Society of Arboriculture) Certified Arborist since 1996.  His main focus is to preserve the natural beauty of trees within the Bay Area’s urban landscape.

Growing up in the El Sobrante valley, Tom has witnessed first-hand the spread of urban development and the efforts to keep land areas protected and “green”.  The Bay Area is unique because it still places a high value on natural environments:  designating approximately one-third of the region as open space, making it closed to urban development.  This includes small city parks as well as regional preserves that stretch thousands of acres.  Now with climate change and seasonal wildfires affecting the Bay Area each year, the urban landscape is constantly evolving.

What is an Arborist Report?

Short answer:  An Arborist Report is a written technical report authored by an ISA Certified Arborist.  It often will provide solutions to tree-related issues while providing expertise and guidance on tree management.

Do I need an arborist report?

Any time you have a tree on your property that needs to be trimmed, removed, or preserved, an Arborist Report can be a valuable tool.  Counties often have requirements for these services to take place and an Arborist Report will cover these requirements in a written statement.


Call Tom (510) 734-7123

International Society of Arboriculture Certified Arborist #WE-3070A

California Contractors License #794981

ISA Tree Risk Assessment Qualified

Our Happy Clients

• “We feel fortunate to have found you. Your work and workers are excellent in every respect!!”
Rev. Paul Hauge
St.Peter’s Church
Rockridge, Oakland

• Dear Mr. Arrington,
“Thank you for your wonderful work. It was a pleasure doing business with you”.
Margarita Emmanuel
Rodeo, Ca

Hi Tom,
Thanks for your help again.
Combination of the pictures we took and the report you wrote convinced the county that we don’t even need a tree permit and I can cut those trees.This saves me time and money. Thanks again for your favor. If I need a good arborist again for my future projects, I will definitely call you again.
Regards, Amir

Tom, Thank you and Maricio for the excellent job and information about all the trees you removed and pruned.  I will be calling again and highly recommend your service to anyone I hear talking about the need for a very professional arborist.