Pest Control Cost in St. Louis (2026 Local Pricing)

Last updated: March 5, 2026

By James — 25-year pest control industry veteran

Pest control cost in St. Louis ranges from $90 to $550 for a one-time visit, with the average homeowner paying about $165. The St. Louis metro area (2.8 million people) sits at the intersection of multiple pest pressure zones, where the Mississippi and Missouri Rivers converge and humid continental weather drives year-round pest activity. Brown recluse spiders, subterranean termites, and rodents are among the most persistent pest problems for homeowners across the metro.

This guide covers local pricing for the most common St. Louis pests, seasonal patterns, and what to look for in a pest control provider. For national pricing benchmarks, see our pest control cost guide.

St. Louis Pest Control Pricing by Service

St. Louis pest control pricing tends to run slightly below national averages across most service categories. The metro has a competitive market with a mix of national chains and well-established regional providers, which helps keep costs in check for homeowners on both the Missouri and Illinois sides.

Common St. Louis Pests and Treatment Costs

Brown recluse spiders ($100 to $300)

St. Louis is one of the brown recluse spider capitals of the United States. The metro sits squarely in the heart of brown recluse territory, and researchers have documented some of the highest concentrations of these spiders anywhere in the country. Unlike most spider species, brown recluse spiders actively infest indoor spaces, and a single home can harbor hundreds of them in wall voids, attics, basements, and closets.

Professional treatment involves crack and crevice applications, dust treatments in wall voids and attics, and sticky glue board monitoring. A single treatment costs $100 to $300, but ongoing quarterly service ($100 to $275 per visit) provides far better long-term control. Older brick homes throughout South City, Tower Grove, Bevo Mill, and the near-suburban areas are particularly prone to infestations. See our spider exterminator cost guide for more details.

Termites ($1,100 to $3,400)

Subterranean termites are a major structural threat throughout the St. Louis metro. Missouri sits within the heavy termite activity zone as defined by the U.S. Department of Housing and Urban Development, and the region's moisture-retaining clay soils create ideal conditions for termite colonies. Eastern subterranean termites are the primary species found in the area, and they can cause significant damage before homeowners notice any signs.

Liquid barrier treatment is the most common approach in St. Louis, costing $1,100 to $3,400 depending on home size. Bait station systems run $1,400 to $3,000 with ongoing monitoring fees. Annual termite inspections ($75 to $150) are strongly encouraged for all homeowners in the metro. Real estate transactions in Missouri frequently require a wood-destroying insect inspection. See our termite treatment cost guide.

Rodents ($200 to $575)

Mice and rats are a persistent problem in St. Louis, especially in older neighborhoods near downtown. Areas like Soulard, Benton Park, Lafayette Square, and the Central West End have aging brick building stock with gaps in foundations, older plumbing penetrations, and basement entries that provide easy rodent access. Norway rats are common at ground level, while house mice infest upper floors, attics, and wall voids.

Rodent removal costs $200 to $575 and typically includes trapping, exclusion (sealing entry points), and sanitation recommendations. Homes near the Mississippi River, the Missouri River bottoms, and flood-prone creek corridors see higher rodent activity due to the proximity of water and dense harborage areas. See our rodent exterminator cost guide.

Cockroaches ($100 to $550)

German cockroaches are the primary indoor cockroach species in St. Louis, and they are especially common in the older brick apartment buildings, duplexes, and multi-family homes found throughout the city. These structures often have shared walls, plumbing chases, and utility runs that allow cockroaches to spread between units. A thorough treatment targeting kitchens, bathrooms, and utility areas costs $100 to $550 depending on severity.

American cockroaches (often called "water bugs" locally) also enter homes through sewer connections and floor drains, particularly in older neighborhoods with aging sewer infrastructure. Basement-level apartments and homes with unfinished basements near the city's combined sewer system see the most American cockroach activity.

Carpenter ants ($150 to $500)

Carpenter ants are a common structural pest in St. Louis, particularly during the humid summer months when moisture levels rise in the river valley. These ants do not eat wood but excavate galleries for nesting, leaving behind sawdust-like frass. Homes with moisture problems, leaky roofs, poor drainage, or older wooden decks are especially susceptible. The humid summers along the Mississippi and Missouri River corridors create prime conditions for carpenter ant colonies.

Treatment involves locating and treating the nest directly, along with perimeter treatments to prevent re-entry. Costs range from $150 to $500 depending on severity and accessibility.

Mosquitoes ($150 to $325)

The Mississippi and Missouri River floodplains create extensive mosquito breeding habitat throughout the St. Louis metro. Low-lying areas, river bottoms, creek corridors, and the numerous ponds and retention basins in suburban developments all contribute to the mosquito population. Mosquito season in St. Louis runs from May through October, with peak activity in June and July.

Monthly barrier spray treatments cost $50 to $80 per visit and are popular for backyard protection during the warmer months. One-time treatments for special events cost $150 to $325.

Boxelder bugs

Boxelder bugs are a seasonal nuisance pest that swarms the south- and west-facing sides of St. Louis homes in fall, seeking shelter for winter. They congregate in large numbers on warm exterior walls and can enter homes through gaps around windows, doors, and siding. While they do not cause structural damage or bite, their sheer numbers can be alarming. Exterior perimeter treatments in early fall ($90 to $200) help reduce the number that make it inside.

Asian lady beetles

Similar to boxelder bugs, Asian lady beetles cluster on the exteriors of St. Louis homes in autumn, particularly on light-colored surfaces. They seek shelter in wall voids and attic spaces for the winter and can emerge indoors on warm days throughout the cold months. They emit a foul odor and can stain surfaces when disturbed. Perimeter treatments applied before peak migration in October help reduce indoor invasions.

Other notable pests

Occasional scorpions have been reported in rural areas south of the St. Louis metro, particularly in the Ozark foothills region of Jefferson County and Ste. Genevieve County. While not common within city limits, homeowners in southern exurban areas should be aware of the possibility. Treatment is typically handled as part of a general pest control visit.

St. Louis Seasonal Pest Calendar

Cost Factors in St. Louis

• Bi-state metro. The St. Louis metro spans Missouri and Illinois, and pest control companies must be licensed in each state separately. Some providers only serve one side of the river, which can limit options. Always verify your provider is licensed in the correct state for your home.
• Home age and construction. St. Louis is known for its older brick housing stock. Homes in South City, North City, and inner-ring suburbs like Maplewood, Webster Groves, and University City often have unfinished basements, older foundations, and construction details that provide entry points for brown recluse spiders, rodents, and termites. Newer suburban homes in St. Charles County, West County, and the Metro East tend to have fewer entry points but remain vulnerable to termites.
• Proximity to rivers and floodplains. Homes near the Mississippi River, Missouri River bottoms, Meramec River, or low-lying creek corridors face higher mosquito pressure and increased rodent activity.
• Lot size and landscaping. Larger lots with mature trees, wood mulch beds, and stored firewood provide harborage for carpenter ants, spiders, and rodents. Treatment costs increase with lot size for perimeter and yard applications.
• Soil type. The heavy clay soils found across much of the St. Louis metro retain moisture and create favorable conditions for subterranean termites. Properties with poor drainage are at elevated risk.

Choosing a Pest Control Company in St. Louis

• Verify state licensing. Missouri requires pest control operators to be licensed through the Missouri Department of Agriculture. Illinois requires licensing through the Illinois Department of Public Health. Confirm your provider holds the correct license for the state where your home is located.
• Get at least three quotes. The St. Louis metro has a healthy mix of national companies and established local providers. Comparing quotes ensures fair pricing and helps you evaluate different service approaches.
• Ask about brown recluse treatment. Given how common brown recluse spiders are in St. Louis, ask specifically what methods the company uses for recluse control (interior treatments, dust applications, glue board monitoring) and whether those treatments are included in the regular service plan.
• Confirm termite coverage is separate. Standard general pest control plans do not include termite treatment. Ask about annual termite inspections and available treatment options, especially if your home has never been inspected.
• Check for cross-river service. If you have properties on both sides of the Mississippi, confirm the company is licensed and operates in both Missouri and Illinois.

For a complete overview of pest control pricing nationwide, see our pest control cost guide.

Frequently Asked Questions