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A Spanish Colonial Revival home with a red tile roof in California — South San Francisco, California service area

Wasp & Bee Removal in South San Francisco, CA

101 Exterminators handles wasp and bee removal in South San Francisco, from yellowjacket ground nests to honey bee colonies inside a wall, California licensed under SPCB Lic. #9119 since 2005. The coastal scrub on San Bruno Mountain runs right up to the back fences at Paradise Valley and Terrabay, and that ground supplies the yellowjackets that turn up in yards below it every August. Identification comes before anyone touches a nest.

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Yellowjackets Nest on the San Bruno Mountain Slope and Forage Down Into the Yards

Western yellowjackets (Vespula pensylvanica) nest underground, usually in an abandoned rodent burrow, and the chaparral and coastal scrub covering San Bruno Mountain along the city's northern border is full of that habitat. Colonies build straight through the dry stretch from spring into October and peak in late summer and early fall — exactly when people are outside. The hillside blocks at Paradise Valley, Terrabay and the streets under the concrete letters on Sign Hill feel it first, but foragers range well down into Orange Park and Sunshine Gardens.

Structures give them the other option: a cavity they never have to build. Stucco soffits on the mid-century tract houses, the air gap under tile roof sections, attic vents with torn screens and the wall voids of the older bungalows near Grand Avenue all work, and the entry hole is often no wider than a pen. Paper wasps (Polistes) take the simpler route and build an open comb under an eave, a patio cover or a play structure, where the nest and the insects on it are in plain sight.

Honey bees (Apis mellifera) are a different problem with a different answer. A swarm that moves into a wall or a chimney builds comb and stores honey, and removing the bees without removing the comb leaves wax and honey sitting in the cavity. It seeps through drywall in warm weather, draws ants and rodents, and the residual scent often pulls another swarm to the same void the following spring. We prioritize live relocation to local beekeepers where the situation allows it.

How We Work in South San Francisco

We identify the insect before anyone gets on a ladder, because bees and wasps get handled differently. In South San Francisco that usually means watching the entry from a distance — a stucco soffit seam, a vent screen, a gap under roof tile — to read the traffic and the direction of travel. Ground nests along the San Bruno Mountain edge get treated at dusk, when the colony is home. When honey bees are inside a wall we talk through opening the cavity, because comb left in place causes its own problems.

South San Francisco Climate

South San Francisco has a coastal fog climate similar to Daly City but slightly warmer on the eastern slopes facing the Bay. The San Bruno Mountain ridgeline deflects some marine influence from the western residential areas. Soil moisture remains elevated year-round from fog drip and winter rains averaging 18–22 inches annually.

Housing Stock

Post-WWII housing dominates — 1940s–1960s wood-frame tract homes across the residential hillside neighborhoods. These structures are 60–80 years old and have had significant cumulative termite exposure. The older downtown-adjacent areas have some pre-1940 construction. Commercial and biotech corridor construction is modern.

Why Local Expertise Matters

South San Francisco's mid-century housing stock and coastal fog exposure create a specific termite risk profile. We understand the crawl space issues common in these homes and provide SPCB-licensed (#9119) inspection and treatment with WDO reports accepted for local real estate transactions.

Signs You Need Wasps & Bees Service in South San Francisco

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

Our Wasps & Bees Process in South San Francisco

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

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.

Wasps & Bees You Can Count On in South San Francisco

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.

Wasp & Bee Removal FAQs for South San Francisco

We found a yellowjacket nest in the ground behind our Terrabay house — what now?

Back away, mark the spot from a distance, and keep people and dogs off that part of the yard until it is treated. Ground nests on the San Bruno Mountain slope usually sit in an old rodent burrow with one small opening, which is why they get hit with a mower or a string trimmer before anyone sees them. A disturbed colony defends the entrance in numbers and yellowjackets can sting repeatedly. Evening treatment, with the whole colony back inside, is what works.

Are the insects under our roof tile in South San Francisco honey bees or yellowjackets?

Watch the traffic before you decide. Yellowjackets fly a fast, direct line, look bare and are sharply banded; honey bees are fuzzier, fly more slowly and often arrive with pollen visible on their legs. Both will use the same air gap under roof tile or behind a stucco soffit, so the location tells you nothing on its own. We confirm the species first, because honey bees may be relocated and the comb has to come out either way.

When are wasps worst in South San Francisco?

Late summer into early fall. Colonies reach peak size after the long dry stretch, and this city gets its warmest, clearest weather at the tail end of summer, so activity holds later than most people expect. Foraging also shifts toward protein and sugar then, which is why they show up at backyard tables and picnic areas around Orange Memorial Park in August and September. Keep food covered and lids seated on outdoor bins through that window.

Free Pest Evaluation in South San Francisco

CA licensed and insured. Written estimate before any work begins. Urgent situations in South San Francisco are prioritized.

Trusted by South San Francisco families since 2005