Hello,

Carpenter ants are often found in trees, especially where there is damage or decay, such as where a limb was removed. These ants do not feed on wood like termites but create galleries within the wood to build their nests. More information is these links:

Carpenter ants nesting in trees and homes - MSU Extension

Carpenter Ants in Trees | Yard and Garden (iastate.edu)

The presence of carpenter ants in a tree does not necessarily mean the tree is in poor health or that the ants are harming the tree. They typically nest in dead tissue, which does not disrupt the flow of water and nutrients in the living parts of the tree. More information is this link:

Carpenter ants nesting in trees and homes - MSU Extension

However, while the ants themselves are not directly harmful to the tree, their activity can indicate that decay is present, which could weaken the tree and make it more susceptible to storm damage. More information in this link:

There is a pile of sawdust-like material at the base of a large tree. What could be the problem? | Yard and Garden (iastate.edu)

Managing the tree's health is important to prevent further decay and potential hazards.

Here are some steps you can take to protect your maple tree:

Inspect the Tree: Look for signs of decay or damage beyond the area with ant activity.

Prune Dead Branches: Remove dead branches to prevent further decay and potential insect infestation.

Improve Drainage: Ensure the tree base is not collecting water, as moisture can promote decay.

Avoid Injury: Protect the tree from mechanical injuries from lawnmowers or other equipment.

Monitor Ant Activity: Monitor the ant activity. It may be a sign of increasing decay if it increases or spreads.

If you’re concerned about the structural integrity of the tree or the extent of the decay, it might be wise to consult with a certified arborist who can provide a professional assessment and advice on any necessary treatments. You can consult a local certified arborist for a more detailed onsite assessment and personalized advice. To find a certified arborist in your Zip Code, go to this link:

Find an Arborist (treesaregood.org) 

I hope this helps!