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Roberts Pest Control
Rodent Control — Mice & Rat Prevention
Best of Jefferson County Winner 2025

Rodent Control

Rodent Control & Mice & Rat Prevention

A single mouse can squeeze through a gap the size of a dime and produce up to 60 offspring per year. Professional exclusion is the only way to permanently solve a rodent problem — traps alone won’t cut it.

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Roberts Pest Control rodent control service in St. Louis

Identify

Common Rodents in St. Louis

Rodents are the most destructive pests that can invade your home. They contaminate food, gnaw through wiring, and spread disease. Knowing which species you’re dealing with determines the right approach.

House Mouse

HEALTH HAZARD

House Mouse

Small, 2–3 inches body with gray-brown fur, large ears, and a pointed snout. Droppings are rod-shaped, about 1/4 inch long. Nests in wall voids, insulation, and stored items. Extremely prolific — a single pair can produce dozens of offspring in one year.

Norway Rat

HEALTH HAZARD

Norway Rat

Large, 7–10 inches body with brown/gray coarse fur, a blunt snout, small ears, and a thick tail shorter than its body. Droppings are capsule-shaped, about 3/4 inch long. Burrows along foundations and under concrete slabs. Aggressive and highly destructive.

Warning Signs

Signs You Have a Rodent Problem

Rodents are nocturnal and avoid open areas. By the time you see one during the day, the population is likely much larger than you think. Watch for these indicators.

Droppings

Mouse droppings are small and rice-grain shaped. Rat droppings are larger and capsule-shaped. Fresh droppings are dark and moist; old ones are gray and crumbly.

Gnaw Marks

Teeth marks on wood, wires, and food packaging. Rodents must gnaw constantly to keep their teeth worn down. Gnawed wiring is a serious fire hazard.

Scratching & Scurrying Sounds

Noises in walls, ceilings, or attics — especially at night. Scratching, scurrying, and squeaking are telltale signs of an active infestation.

Grease Marks Along Baseboards

Rodents follow the same paths repeatedly, leaving dark, greasy rub marks along walls and baseboards from the oils in their fur.

Nesting Material

Shredded paper, insulation, fabric, or other soft materials gathered into hidden nests in wall voids, attics, or behind appliances.

Musty Urine Odor

A strong, ammonia-like smell — especially in enclosed areas like cabinets, closets, and attics. The odor intensifies as the population grows.

Our Process

Professional Rodent Control — 5 Steps

Effective rodent control requires more than traps. Our proven process eliminates the current population and prevents re-entry.

  1. Inspection & Entry Point Assessment — We thoroughly inspect your home inside and out to identify how rodents are getting in — gaps, cracks, pipe penetrations, garage doors, and soffit vents.
  2. Strategic Trapping — Professional trap placement in high-activity areas for maximum effectiveness. We use the right trap type and placement based on species and behavior patterns.
  3. Exterior Bait Stations — Tamper-resistant bait stations installed around the perimeter. Inaccessible to children and pets, these stations reduce the exterior population pressing against your home.
  4. Exclusion Sealing — We seal ALL entry points — gaps, cracks, pipe penetrations, garage doors, soffit vents, and any opening larger than 1/4 inch. This is the most critical step.
  5. Follow-Up Monitoring — We return to verify elimination, check bait stations, inspect exclusion work, and ensure no new entry points have developed.

Why Exclusion Matters

Trapping and baiting without exclusion is like mopping the floor with the faucet running. Mice and rats will keep entering through the same gaps. Our exclusion process seals every entry point — foundation cracks, pipe penetrations, garage door gaps, soffit vents — so new rodents can’t replace the ones we remove.

Common entry points we seal:

  • Foundation cracks and gaps
  • Pipe and utility penetrations
  • Garage door weatherstripping
  • Soffit and ridge vents
  • A/C line entry points
  • Dryer vent covers
  • Gaps around windows and doors
  • Roof-to-fascia junctions

Prevention

Keep Rodents Out — Homeowner Tips

Seal Gaps Larger Than 1/4 Inch

Mice can squeeze through a gap the size of a dime. Inspect your foundation, siding, and roofline for any openings and seal with steel wool, caulk, or metal flashing.

Install Door Sweeps

Gaps under exterior doors are a highway for rodents. Install tight-fitting door sweeps on all entry doors, including the garage.

Store Food in Sealed Containers

Transfer pantry items from cardboard and bags into hard-sided, airtight containers. This removes the food source that attracts and sustains rodent populations.

Keep Trash Cans Closed

Use trash cans with tight-fitting lids, both indoors and outdoors. Open garbage is an open invitation.

Remove Bird Feeders Near the House

Spilled birdseed is one of the top attractants for mice and rats. Move feeders at least 20 feet from the house or remove them entirely during infestations.

Trim Tree Branches Away from Roof

Branches touching or overhanging your roof give rodents a direct path to your attic. Maintain a 4-foot clearance between trees and your roofline.

Eliminate Outdoor Harborage

Woodpiles, debris, tall grass, and ground cover near the foundation provide shelter and nesting sites. Keep a clean, clear perimeter around your home.

Questions

Frequently Asked Questions

How do rodents get into my house?
Mice can fit through gaps as small as a dime (1/4 inch). Rats need only a quarter-sized opening. Common entry points include foundation cracks, pipe penetrations, garage door gaps, soffit vents, and gaps around utility lines. If you can slide a pencil into it, a mouse can get through it.
Is bait dangerous to my pets?
We use tamper-resistant bait stations that are designed to be inaccessible to pets and children. The stations are locked and anchored, and only rodents can access the bait inside. Interior control relies on trapping rather than bait for added safety.
How long does it take to solve a rodent problem?
Active trapping typically reduces the population significantly within 1–2 weeks. Exclusion sealing provides the permanent fix — once all entry points are sealed, no new rodents can enter. The full process including follow-up monitoring is usually complete within 2–4 weeks.
Do you remove dead rodents?
Yes. Dead rodent removal is included in our service. If a rodent dies in an accessible wall void or attic space, we will locate and remove it. We also sanitize affected areas to eliminate odor and health risks.

Get Rodents Out — Keep Them Out

Free Quotes. Same-day service available. 100% satisfaction guaranteed.

(636) 243-0900
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