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A contemporary two-story home in a South Bay neighborhood — Foster City, California service area

Stinging Insect Control

Wasp & Bee Removal in Foster City, CA

101 Exterminators handles wasp and bee removal in Foster City for homes, townhome complexes, and commercial properties, California licensed under SPCB Lic. #9119 and working since 2005. With no natural hillsides in this city, western yellowjackets nest in what was built instead — lagoon riprap, irrigation boxes, and voids under deck framing. We find the nest before we treat it.

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Local Context

With No Hillsides Here, Yellowjackets Nest in Riprap and Irrigation Boxes

Western yellowjackets (Vespula pensylvanica) normally take a dry bank or an abandoned burrow in sloped ground, and Foster City has neither, sitting flat on engineered fill with zero natural hills. So they use the constructed equivalents: voids inside the rock riprap along the lagoon banks and the levee, old rodent burrows in irrigated turf around Sea Cloud Park and Boothbay Park, irrigation valve boxes, and the space under raised deck and dock framing on the water-facing streets. Colonies peak from August into October, when workers turn to hunting protein and sugar.

Paper wasps take the buildings, and here they take the same buildings. Foster City was built out from the mid-1960s into the 1980s to a narrow set of details: stucco walls, tile or composite shingle roofs, deep eave overhangs, covered carports and shared patio structures in the townhome rows. That gives open-comb nests the same three or four positions on street after street, from Sand Harbour through Plum Island: under the eave, inside the tile roof edge, at a stucco weep screed, behind a carport beam.

Honey bees are the different call. A swarm that moves into a Foster City wall void or chimney chase has found a cavity in a wall system with limited ventilation, and once comb is built the wax and honey remain after the colony is gone — drawing ants, cockroaches, and beetles, and eventually staining through drywall. For an accessible swarm that has not built comb yet, transfer to a local beekeeper is possible. For an established hive inside a wall, the comb has to come out.

How We Work in Foster City

We identify the species and locate every nest before treating, because a paper wasp comb under an eave and a yellowjacket colony inside riprap are different jobs. Techs work in full protective gear and prefer evening treatment for ground and void nests, once foragers are back inside. Accessible nests come down afterward. On Foster City tile roof edges and stucco soffits we then seal the cavity that was used, since an unsealed void gets re-colonized the next season by a different queen.

Foster City Climate

Foster City sits on the Bay side of the Peninsula near the San Mateo Bridge approach, in the wind gap that funnels air in off the water. It is windier and far less fog-bound than the coastal cities over the ridge, with temperatures in a narrow band and annual rainfall of 17 to 19 inches. What matters for structures is not the air temperature but the humidity coming off the lagoon and the Bay. Wood in contact with damp ground dries slowly here, and the mild winters mean subterranean termite foraging never shuts down the way it does inland.

Housing Stock

Every Foster City neighborhood went up between roughly 1965 and the 1990s, and the high water table rules out basements, so most homes sit on a concrete slab rather than over a crawl space. That changes where termites show up. Instead of mud tubes on a pier, the routes are the slab edge, expansion joints, plumbing penetrations, and the gap behind stucco where it runs down to grade, which means a colony can be working inside a wall with nothing visible from the substructure. Lagoon frontage adds a second exposure: those parcels carry wooden bulkheads and dock framing at the water line, plus the fence and deck that tie into them. A large share of the city is townhomes and condominiums under HOA governance, where an inspection that stops at a unit line usually misses the building.

Why Local Expertise Matters

Foster City is not a standard Peninsula termite job. There is no crawl space to walk in most of the housing and no century of old framing to explain the damage. The building is young and the ground is the variable. We inspect slab construction the way slab construction has to be inspected: perimeter grade and slab edge, expansion joints and plumbing penetrations, wall voids where they meet the foundation, and any wood touching soil or lagoon water. Where there is a bulkhead or a dock we inspect that framing too, since it is the wettest wood on the parcel. We write WDO reports for real estate transactions and work with HOA boards and property managers when the building rather than the unit is the scope. SPCB Lic. #9119.

Warning Signs

Signs You Need Wasps & Bees Service in Foster City

We treat yellow jacket nests (including in-ground and wall-void nests), paper wasp nests under eaves and overhangs, European and bald-faced hornet nests, and mud dauber tubes. For honey bee hives established in walls or structures, we provide complete treatment and nest removal including comb excavation to prevent future odor and secondary pest attraction. For accessible swarms, we can arrange transfer to a local beekeeper.

Visible nest under eaves, in shrubs, attached to window frames, in tree cavities, or in attic vents

Repeated wasp activity near a specific location on the structure — nest is likely nearby

Wasp or bee activity around a specific gap, crack, or vent opening — indicates cavity nest inside

In-ground yellow jacket activity — small hole in soil or mulch bed with wasps entering and exiting

Honey bee swarm visible on a tree, shrub, or structure — usually a temporary cluster

Buzzing sounds within walls, soffits, or chimney area — established honey bee hive

How It Works

Our Wasps & Bees Process in Foster City

Every job follows the same methodical approach — no shortcuts, no guesswork. Here is what to expect when you work with us in Foster City.

01

Species & Nest Location

We identify the species and locate all nesting sites, including in-wall or structural voids that require special access. Species determines the treatment approach.

02

Treatment in Protective Equipment

Our technicians treat nests in full protective equipment — veil, suit, and gloves. Evening treatment is preferred for ground nests when foragers have returned to the nest.

03

Nest Removal

After treatment, accessible nests are physically removed. For wall-void nests, we advise on comb removal to prevent secondary pest attraction from wax, honey, and larval material.

04

Entry Point Sealing

We seal entry points used by cavity-nesting species to prevent re-colonization by a new colony in the same location.

Why 101 Exterminators

Wasps & Bees You Can Count On in Foster City

Bee Relocation Option

When possible, we work with local beekeepers to relocate honey bee swarms and accessible hives rather than exterminating them. Good for bees, good for local agriculture.

Wall-Void Nest Removal

Nests inside walls require more than just treatment — the comb must be removed to prevent honey seepage, secondary pests, and odor. We handle the complete remediation.

Urgent Situations Come First

A wasp nest near an entry door, child's play area, or pet run is a safety emergency. We move these ahead of routine work.

Evening Ground Nest Treatment

Yellow jacket ground nests are treated at dusk when the full colony has returned, maximizing effectiveness and minimizing any risk of disrupted forager activity.

Common Questions

Wasp & Bee Removal FAQs for Foster City

Where do yellowjackets nest in Foster City when the whole city is flat?

In the voids the built environment supplies. Western yellowjackets (Vespula pensylvanica) use rock riprap along the lagoon banks and levee, abandoned rodent burrows in irrigated park and lawn turf, irrigation valve boxes, wall voids, and the space beneath raised deck and dock framing. Activity peaks from August into October as colonies reach full size. Finding the actual entry hole matters more than counting the wasps you see, so we watch the flight line first.

There are bees in the wall of our Foster City townhome — can they be relocated?

A swarm that has just landed and not yet built comb can often be transferred to a local beekeeper. Once a colony is established inside a wall, relocation stops being realistic and the comb has to be opened up and removed. Leaving wax and honey in a stucco wall draws ants, cockroaches, and beetles, and it eventually bleeds through drywall. We treat, remove comb where access allows, and seal the cavity behind it.

Are wasps worse around the Foster City lagoon and parks in late summer?

Late summer is the peak — August into October, when colonies reach maximum population and workers forage aggressively for protein and sugar. That overlaps with the busiest stretch at Leo J. Ryan Memorial Park, Sea Cloud Park, and the lagoon-side patios. Keeping food covered, lids on trash containers, and sweet drinks in closed cups cuts encounters sharply. For a nest on your own property, note the flight line and leave it undisturbed until it is treated.

Local Pest Pressure

Common Pests We Treat in Foster City

Every area has its own pest profile shaped by climate, housing, and geography. These are the pests we see and treat most often in Foster City — tap any one to learn how to identify it and what treatment involves.

Subterranean Termites

Foster City's reclaimed Bay land has persistently high water tables creating ideal soil moisture for subterranean termite foraging

Drywood Termites

Active in wood-frame structures across the city; less dominant than subterranean but present

Roof Rats

Bay-adjacent landscaping and lagoon corridors provide habitat and movement routes for roof rats

Argentine Ants

Consistent indoor pressure through spring and fall across Foster City's residential areas

Dampwood Termites

High-moisture conditions near lagoons can support dampwood termites in structures with wood-soil contact

Wasp & Bee Removal · Foster City

Free Pest Evaluation in Foster City

CA licensed and insured. Written estimate before any work begins. Urgent situations in Foster City are prioritized.

Schedule an Inspection(831) 500-1613
Trusted by Foster City families since 2005