San Diego has some of the most varied termite activity in California. The mild coastal climate allows drywood termites to swarm in the fall, damp marine air supports dampwood species, and subterranean termites exploit irrigated soil. A small but well-known Formosan termite presence has also been recorded in the county, which makes accurate identification especially important here.
Four kinds of termite, four patterns
Drywood termites live entirely inside sound, dry wood, and are the most common in stucco homes across the county, from North Park bungalows to ranch houses in Clairemont and Rancho Penasquitos. They enter through attic vents, eaves and cracks in trim, and push out tiny six-sided pellets. Dampwood termites favor wood with a lot of moisture, such as fascia boards, deck posts and framing near leaks, and appear more near the coast in places like La Jolla, Ocean Beach and Point Loma. Western subterranean termites nest in soil and build mud tubes up foundations. Formosan termites, in rare localized infestations, are much more destructive and need specialized treatment.
Why stucco and Spanish-style homes need extra attention
Stucco covers exterior walls but not the vents, eaves, rooflines and window frames where termites enter. Spanish-style and Mission-revival houses in Mission Hills, Kensington and Golden Hill often have wood beams, exposed rafter tails and decorative trim that are easy targets. Many of these homes have older attics that are hard to inspect fully, so damage may go unnoticed for years.
Signs to watch
- Tiny pellets, like sand or coffee grounds, collecting on window sills or below wood.
- Discarded wings near doors and windows after a warm fall evening.
- Wood that sounds papery or hollow when tapped.
- Mud tubes along foundation walls and in crawl spaces.
- Soft, blistered paint on trim.
Inspection and treatment
A licensed inspector examines the attic, subarea, garage, eaves, decks and exterior wood, then writes up findings. California requires licensed operators for structural termite work, and a written inspection report is standard in many home sales. Options for drywood termites include whole-structure fumigation with tenting, or localized treatments such as wood injections, heat or borate for small areas. Dampwood problems are generally resolved by repairing the moisture source and replacing damaged wood. Subterranean termites are controlled with soil barriers or baits.
Your provider should explain why a certain method fits your home, how long you may need to be away, and what preparations are required.
Buyers and sellers of San Diego homes see termite reports more than most owners, because wood-destroying organism inspections are routine in escrow here. If a report lists drywood activity or fungus damage, ask your provider what is active, what is old, and what is a lower-priority condition. Homes in older coastal neighborhoods may have repeated past treatments, so records matter.
Prevention
- Paint or seal exposed wood on eaves, fascia and window trim.
- Fix roof, gutter and plumbing leaks quickly.
- Screen attic and crawl space vents.
- Keep soil, mulch and planters below stucco weep screeds.
- Store firewood off the ground and away from the house.
What happens when you call
PestMinistry is a referral service, not a termite company. Call (844) 725-1661 and we will connect you with an independent licensed provider in our network who handles termite control in San Diego. The provider inspects and carries out treatment.
Termite questions in San Diego
Do I need to leave home for fumigation?
Yes, for whole-structure treatment. It usually takes a few days, and your provider gives instructions about food, plants and pets.
When do drywood termites swarm?
Often on warm days in late summer and fall, including during Santa Ana wind conditions.
Are Formosan termites common here?
No. They are limited to small areas, but they are serious, so any suspect activity should be checked.
Can I treat a small area myself?
Spot products rarely reach the whole colony. A professional can confirm the species and extent.