Ask a Tacoma pest professional what they see most, and carpenter ants rank near the top. Tall evergreens, wet wood and mild winters are exactly what these ants need. They are joined by smaller species that parade through kitchens and bathrooms in search of food. Getting the right diagnosis is important, because the nest location and the moisture source drive the solution.
Ants of the Puget Sound lowlands
Carpenter ants are large and black, sometimes with reddish markings, and they excavate galleries in damp or decayed wood. Colonies are usually found in stumps, logs and trees, with satellite colonies in houses. Moisture ants are yellowish or brown, smell of lemon or citronella when crushed, and infest wet, decaying wood in foundations and sills. Odorous house ants follow trails to sweets and nest in wall voids. Pavement ants nest under slabs, pavers and driveways. European fire ants have been reported in parts of the region, nesting in gardens and under stones and delivering a painful sting when disturbed.
What makes Tacoma attractive
Plenty of rain, and plenty of trees. Many neighborhoods, from the North End to Proctor and the West End, have mature Douglas fir, cedar, maple and cherry trees whose branches reach roofs. Decaying stumps and firewood piles are natural nest sites. Hillside homes get runoff from above, and clogged gutters soak walls. Old wood porches, window sills and original siding hold moisture and rot, offering carpenter ants an easy start. Moss-covered roofs add to the dampness. Even a small leak behind a tub or beneath a dishwasher can attract a colony.
Evidence worth acting on
- Large black ants walking around your kitchen at night, particularly in spring.
- Shavings like coarse sawdust beneath window sills or in basements.
- Rustling in walls that sounds like crinkling paper.
- Swarmer ants in the house in spring.
- Trails leading from a tree or stump toward the foundation.
Professional methods
A technician traces ants to the nest, which may be outside in a tree or stump, and inside in a wet wall. Treatments include baits, dusts into voids, and perimeter products, and they pair with repairs to remove the moisture. Moisture ants often disappear once the wet wood is replaced. For odorous and pavement ants, baits and exterior treatments handle most cases. Because colonies can be large and have multiple nests, a thorough inspection and follow-up are normal. Without addressing the moisture, carpenter ants often return.
Prevention in a wet climate
- Clear gutters and downspouts before fall rains.
- Trim limbs so they do not touch the roof or siding.
- Remove stumps, fallen logs and firewood piles close to the house.
- Replace rotten wood and seal exposed end grain.
- Fix plumbing leaks promptly, especially around bathrooms and kitchens.
Where to start
If you are seeing big ants indoors or fine wood debris, call (844) 725-1661. PestMinistry is a referral service, and we connect Tacoma callers with licensed independent providers who identify the ants and treat them.
Are carpenter ants dangerous to a house?
They can weaken wood over time, especially if a colony goes unnoticed for seasons.
Why do I see ants in winter?
A nest inside a warm wall can stay active, and mild Tacoma winters keep outdoor colonies close.
How can I tell moisture ants from carpenter ants?
Moisture ants are smaller and yellowish, with a citrus-like smell; carpenter ants are larger and darker.
Will baits fix everything?
For small ants, often yes. For carpenter ants, finding the nest and fixing moisture matter most.