Cockroach Elimination
Cockroach Control in San Mateo, CA
101 Exterminators does cockroach control in San Mateo for homes, restaurant kitchens and multi-unit buildings, California licensed under SPCB Lic. #9119 since 2005. German cockroaches (Blattella germanica) arrive on deliveries, packaging and used appliances, then spread through shared plumbing walls — none of which reflects on the household. We locate the harborage, bait it, and come back to confirm the population dropped.
Warning Signs
Signs You Need Cockroaches Service in San Mateo
Species-specific treatment using gel baits, insect growth regulators (IGRs), and targeted void treatments. Gel bait is placed directly at harborage sites — behind refrigerators, under sinks, inside wall voids — where cockroaches consume and transfer it to others in the colony. IGRs prevent juvenile cockroaches from reaching reproductive maturity, collapsing the population within 2–4 weeks. Commercial kitchen programs include written documentation of conducive conditions for health inspection compliance.
Live cockroaches seen during the day — indicates a large infestation overflowing harborage sites
Cockroach droppings (small, dark, pepper-like pellets) under sinks, behind appliances, or in cabinets
Egg cases (oothecae) — small, brown, capsule-shaped casings — in sheltered areas
Musty or oily odor in kitchen, bathroom, or utility areas
Shed cockroach skins near harborage sites
Cockroach activity visible in commercial kitchen equipment, drain areas, or food storage
How It Works
Our Cockroaches Process in San Mateo
Every job follows the same methodical approach — no shortcuts, no guesswork. Here is what to expect when you work with us in San Mateo.
Inspection & Species ID
We identify the cockroach species and locate all harborage sites — behind refrigerators, under sinks, inside wall voids, and in any warm, dark area near moisture or food. Species identification determines the correct bait and treatment approach.
Bait Application
Gel bait is placed at harborage sites in quantities cockroaches will find and consume. Bait is formulated to be transferred between individuals — a single fed cockroach will infect others in the colony, reaching the full population.
IGR Treatment
Insect Growth Regulators (IGRs) prevent juvenile cockroaches from reaching reproductive maturity, collapsing the population within 2–4 weeks even without direct contact with adults.
Exclusion & Prevention
We identify and seal gaps around plumbing penetrations, appliances, and wall voids that provide harborage. For commercial kitchens, we provide a written report of conducive conditions for health inspection compliance.
Why 101 Exterminators
Cockroaches You Can Count On in San Mateo
Bait-Based Treatment
Gel bait reaches cockroaches that surface sprays cannot — inside appliances, wall voids, and harborage sites that sprays would scatter.
Health Inspection Ready
Our commercial cockroach programs are documented and meet California health department expectations for food-handling facilities.
IGR Included
Insect Growth Regulators prevent resistant survivors from reproducing, ensuring the population collapses rather than rebounds.
No Surface Spray Scattering
Broad spray applications push cockroaches into new harborage areas. Our targeted approach eliminates colonies in place.
Common Questions
Cockroach Control FAQs for San Mateo
Does having cockroaches mean my San Mateo apartment is dirty?
No. German cockroaches are carried in — on cardboard, in a grocery delivery, inside a used appliance, or from an adjacent unit through a shared plumbing chase — and they establish readily in a spotless kitchen that has warmth and water. Sanitation affects how fast a population grows once it is present, which is a separate question from how it arrived. Reporting it early is what keeps the job small.
Why do the roaches in my San Mateo garage look different from the ones in the kitchen?
They are probably two species that need two different treatments. German cockroaches are small and tan with two dark stripes behind the head, and they stay indoors near warmth and water. Oriental cockroaches are larger, dark and glossy, live outdoors in drains, meter vaults and damp sub-areas, and enter at ground level through a garage door gap or floor drain. One calls for interior baiting; the other calls for exclusion and moisture correction.
Do store-bought sprays help with roaches in a San Mateo kitchen?
They usually make the problem harder to finish. Repellent aerosols kill the roaches you can see and drive the rest deeper into wall voids and appliance housings, scattering a population that had been concentrated in one place. They also contaminate the surfaces where bait would otherwise work, so professional treatment starts at a disadvantage. Monitors and targeted bait placement are what bring numbers down, with a follow-up visit to confirm it happened.
Local Pest Pressure
Common Pests We Treat in San Mateo
Every area has its own pest profile shaped by climate, housing, and geography. These are the pests we see and treat most often in San Mateo — tap any one to learn how to identify it and what treatment involves.
Cockroach Control · San Mateo
Free Pest Evaluation in San Mateo
CA licensed and insured. Written estimate before any work begins. Urgent situations in San Mateo are prioritized.