Pest Control in O'Fallon, MO

Pest and termite control for St. Charles County's largest city.

Serving Missouri since 1968
Veteran-owned, 3rd generation
100% guaranteed
Same-day service in most cases

Local pest control in O'Fallon

Your O'Fallon exterminator, close to home

O'Fallon is the largest city in St. Charles County, and it has every kind of property we work on: 1980s ranch homes, brand-new subdivisions off Highway K and Highway N, apartment communities and a long list of businesses along I-70 and I-64. That variety means pest problems vary block by block, and a one-size plan does not cut it.

McCarthy has treated O'Fallon homes and businesses for decades. We look at how your property is built, what surrounds it and what you are seeing, then set up treatment that solves the problem and keeps it from coming back, with free re-treatment if it does.

We serve homes and businesses throughout O'Fallon (ZIP 63366 and 63368) with residential pest control, commercial service and termite protection, all backed by our free re-treatment guarantee.

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Serving O'Fallon from our St. Charles headquarters

954 Sycamore Dr, St. Charles, MO 63304

(636) 441-1300

Our St. Charles headquarters in Harvester dispatches technicians across the county. Hours: M-F 7am-5pm, weekends by appointment.

What we see most

Common pests in O'Fallon homes and businesses

Subterranean termites

Termites are active across O'Fallon, from older neighborhoods near Fort Zumwalt Park to new construction on former farmland.

Ants

Odorous house ants and pavement ants are the top spring and summer complaint we hear from O'Fallon homeowners.

Cockroaches

Multi-family buildings and commercial kitchens along the Highway K and I-70 corridors need ongoing cockroach prevention.

Mice

As farm fields on the edges of town are developed, displaced field mice look for shelter in nearby garages and basements.

Plan ahead

O'Fallon pest calendar

Pest activity in St. Charles County changes with the seasons. Here is what to watch for around O'Fallon through the year.

Spring

Termite swarms, ant trails, carpenter bees

Summer

Wasps, yellowjackets, mosquitoes, fleas

Fall

Mice, spiders, crickets, Asian lady beetles

Winter

Rodents, cockroaches in heated buildings

Our services

Pest control services in O'Fallon, MO

Home Pest Control

Year-round protection from ants, spiders, roaches and rodents.

Commercial Pest Control

Scheduled service and records for restaurants, offices and retail.

Termite Treatment

Inspections, treatment and ongoing termite protection.

Fumigation

Targeted fumigation for stubborn, hard-to-reach infestations.

Where we work in O'Fallon

We cover every O'Fallon neighborhood, from the historic downtown to the newest subdivisions on the edge of town.

Downtown O'Fallon
Fort Zumwalt Park area
Highway K corridor
Highway N corridor
Winghaven
I-70 & I-64 business corridors
ZIP 63366
ZIP 63368

Why O'Fallon chooses McCarthy

This third-generation, veteran-owned company has provided exceptional service for thousands of residential and commercial customers since 1968. Our medium size lets us control the quality of every job and focus on customer care.

If pests return between your regularly scheduled services, we re-treat at no cost to you.

Awesome service and they keep their word. Rare these days to find a company that knows what customer service is all about. All this, quality products and at a reasonable price. It’s a no-brainer.