Cockroach Elimination
Cockroach Control in Palo Alto, CA
101 Exterminators handles cockroach control in Palo Alto for homes, apartments and food service, licensed in California under SPCB Lic. #9119 since 2005. Two species account for nearly every call here: German cockroaches (Blattella germanica), which arrive in a box or through a shared wall, and American cockroaches (Periplaneta americana), which come up drains and sewer laterals. They need different treatments, and neither says anything about housekeeping.
Warning Signs
Signs You Need Cockroaches Service in Palo Alto
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 Palo Alto
Every job follows the same methodical approach — no shortcuts, no guesswork. Here is what to expect when you work with us in Palo Alto.
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 Palo Alto
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 Palo Alto
I keep finding big cockroaches in the downstairs bathroom of my Old Palo Alto house. Where are they coming from?
Almost certainly the plumbing, not the kitchen. American cockroaches live in sewer lines, storm drains and damp sub-areas, and they surface through dried-out floor drains, unused fixture traps, open cleanouts and gaps where a pipe passes through the floor — all common in the older Palo Alto neighborhoods with original laterals. Running water into a seldom-used trap once a month refills the seal and closes the easiest route. We check the sub-area and the penetrations for the rest.
Does getting German cockroaches mean my Palo Alto apartment is dirty?
No. German cockroaches are introduced — they arrive on a cardboard delivery box, a used appliance, secondhand furniture, or through a shared wall or plumbing chase from an adjoining unit. Spotless homes get them and heavily lived-in homes do not. What sanitation actually changes is how fast a population grows once it is inside and how well bait competes with other food, which is why we talk about crumbs and grease as a treatment variable rather than a judgment.
Why did a store-bought spray make the cockroaches in my Palo Alto kitchen worse?
Because repellent aerosols scatter German cockroaches out of a concentrated harborage and into wall voids and neighboring rooms, and this species develops pyrethroid resistance quickly. You end up with the same population spread across more places, and any bait put down afterward sits in residue they now avoid. Professional treatment relies on non-repellent gel bait and insect growth regulators for that reason. If you have already sprayed, tell us where — it changes where the bait can go.
Local Pest Pressure
Common Pests We Treat in Palo Alto
Every area has its own pest profile shaped by climate, housing, and geography. These are the pests we see and treat most often in Palo Alto — tap any one to learn how to identify it and what treatment involves.
Cockroach Control · Palo Alto
Free Pest Evaluation in Palo Alto
CA licensed and insured. Written estimate before any work begins. Urgent situations in Palo Alto are prioritized.