Pest Control in San Francisco, California

Yes. We connect San Francisco homeowners and businesses in San Francisco County with licensed, state-certified pest management professionals. Our network covers all of California and is available for pest inspections, treatments, exclusion, and recurring management programs in San Francisco and surrounding communities. Call (844) 920-3454 to speak with a California-licensed pest control professional.

Coastal conditions in San Francisco County create elevated pest pressure across multiple categories. Salt air accelerates wood deterioration, creating entry points that pests exploit. High average humidity maintains moisture levels that subterranean termites need for foraging through otherwise dry seasons. Dampwood termites — which don't require soil contact — are more common in coastal California than inland areas. Annual inspection is particularly valuable for San Francisco homeowners given these multiple climate-driven pressures.

Drywood termites can infest wood furniture, picture frames, hardwood flooring, and structural trim without soil contact. Subterranean termites require soil moisture and are far less likely to infest furniture unless it has soil contact or is positioned in a very moist environment. Infested furniture moved from a high-pressure region can introduce drywood termites to new areas — a documented pathway for urban spread.

The most reliable early indicators are mud tubes running along foundation walls, framing, or concrete block; wood that sounds hollow when tapped; termite frass — small pellets produced by drywood species — collected near wood trim or furniture; and discarded wings near windows or door frames following a swarm. Active swarmers inside a structure indicate an established colony, not just foraging activity.

Three termite types are relevant for most U.S. homeowners: subterranean termites, which nest in soil and construct mud tubes to reach above-ground wood; drywood termites, which nest inside the wood they infest and are most common in coastal and warm-climate regions; and dampwood termites, which require wood with elevated moisture content and typically infest wood in contact with soil or affected by plumbing leaks.

Subterranean termites maintain soil contact to regulate moisture, build mud tubes for surface travel, and typically enter structures from below. Their colonies can contain several hundred thousand workers. Drywood termites live entirely within the wood they consume, produce distinctive pellets called frass, and do not need soil contact. Treatments differ significantly — drywood infestations may require localized injection or whole-structure fumigation.

Structural damage from subterranean termites rarely develops overnight, but colonies with several hundred thousand workers consume wood continuously and can cause significant damage within three to five years if untreated. Formosan termite colonies — which can exceed one million workers — are capable of severe damage within a year or two of establishment. Damage accumulates silently because it occurs inside structural members.

Termite swarming in California follows temperature and moisture triggers that vary by species and region. Eastern subterranean termites most commonly swarm in spring when soil temperatures warm. In warmer parts of California, swarms may occur from late winter through early summer. Formosan termites in Gulf Coast and tropical climates swarm in spring evenings. A licensed pest management professional can identify which species are active in your area of California.

Subterranean termites are attracted by cellulose in contact with soil — wood siding that reaches the foundation, form boards left in place after construction, mulch retained against the structure, and wood debris in crawl spaces. Moisture is a secondary attractant — wood softened by leaks or condensation is easier to consume and more detectable by foraging workers. Eliminating soil-to-wood contact and moisture sources reduces structural risk.

Active subterranean termite infestations are most commonly treated with liquid termiticide applications to the soil around and under the foundation, creating a treated zone that kills or repels foragers. Termite bait systems are an alternative approach that uses delayed-action toxicants carried back to the colony. Drywood termites may be treated with localized injection or whole-structure fumigation depending on infestation scope.

A termite bait station is a plastic housing installed in the soil at intervals around the structure perimeter. Inside is cellulose material that termites locate while foraging. When activity is detected, a delayed-action active ingredient is added. Workers carry the material back to the colony and distribute it to nestmates, eventually eliminating the colony. Bait systems require ongoing monitoring to function correctly.

Liquid termite treatment involves applying a termiticide to the soil around and beneath a structure's foundation — through trenching and rodding around the perimeter, injection through concrete slabs at regular intervals, and treatment beneath slabs where accessible. Repellent termiticides create a treated zone termites avoid; non-repellent termiticides are carried back to the colony by workers who contact the treatment zone.

Non-repellent liquid termiticides applied by licensed professionals typically maintain effectiveness in the soil for five to ten years under standard conditions, though soil type, moisture, and disturbance can affect longevity. Bait systems require ongoing monitoring and periodic replenishment. The specific duration depends on the products used, application conditions, and whether the soil treatment remains undisturbed.