Home Pest Control Guide: How to Prevent, Identify & Get Rid of Pests

by Parul Yadav
October 1, 2026
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Home pest control means preventing, identifying, monitoring, and removing unwanted pests from your home. Effective pest control for homes starts with controlling food and moisture, maintaining the property, and sealing suitable entry points. Traps, baits, and targeted treatments can help with specific problems, while professional help may be appropriate for persistent, widespread, or difficult infestations.

Pests enter homes because they can find food, water, shelter, warmth, or suitable ways inside. Common warning signs include droppings, property damage, nests, unusual sounds or odors, and repeated sightings. This guide explains how household pest control works, how to prevent infestations, how to inspect your home, when DIY methods make sense, and when professional pest management may be appropriate.

What Is Home Pest Control?

Home pest control is a combination of prevention, inspection, identification, treatment, and monitoring. It is not simply about spraying chemicals whenever you see an insect or rodent. The Environmental Protection Agency describes integrated pest management, or IPM, as an approach that emphasizes prevention, monitoring, identification, and appropriate control methods.

A practical home pest prevention strategy follows a simple process:

Identify → Inspect → Prevent → Monitor → Treat

Pest Prevention

Prevention focuses on removing the conditions that allow pests to enter or survive. This includes controlling food and moisture, sealing suitable openings, reducing unnecessary clutter, and maintaining areas around the home.

Common prevention measures include:

Control food: Store food securely and clean crumbs, spills, and food residue
Control water: Repair leaks and address persistent moisture
Seal openings: Close suitable gaps around doors, windows, foundations, and utility penetrations
Reduce shelter: Keep storage areas organized and remove unnecessary clutter
Maintain the property: Address drainage, vegetation, screens, doors, and other potential access points

These steps cannot guarantee that pests will never enter your home, but they can reduce the conditions that support pest activity.

Home Inspection

A home inspection looks for both pests and evidence of their activity. Start with areas where food, water, warmth, shelter, or entry points are available.

Check:

Under sinks and around plumbing
Behind and beneath appliances
Inside cabinets and pantry areas
Around exterior doors and windows
In garages, basements, and attics
Around foundations and exterior walls
Near garbage and food-storage areas

A flashlight, inspection mirror, or inspection camera can make dark or difficult areas easier to examine.

Pest Identification

Identify the pest before choosing a treatment whenever possible. Different pests have different behaviors, hiding places, food sources, and control methods, so treating the wrong pest can waste time and leave the underlying problem unresolved.

If you cannot confidently identify an unfamiliar pest, consider getting help from a qualified pest professional or a reliable local university extension resource.

Pest Treatment or Removal

Treatment should match the pest and the conditions supporting it. Depending on the situation, control may involve:

Physical exclusion
Sanitation
Traps
Baits
Monitoring
Removing accessible food or shelter
Targeted pesticide use
Professional pest management

If you use a pesticide, read and follow the product label. EPA guidance explains that pesticide labels provide directions and precautions for using products legally and safely.

Monitoring

Monitoring tells you whether your control measures are actually addressing the problem. Continue checking for new sightings, fresh droppings, damage, active trails, nests, trap activity, or other signs associated with the pest.

If activity continues, reassess the pest identification and look again for an overlooked entry point, food source, moisture problem, or shelter area.

Why Do Pests Enter Homes?

Pests enter houses when the building provides resources or conditions that support them. Food, water, shelter, warmth, and accessible openings can all contribute to pest activity.

Understanding what attracts pests to your home helps you address the underlying conditions instead of relying only on sprays or other treatments.

Food

Many household pests are attracted to accessible food and food residue. Common sources include:

Unsealed pantry foods
Crumbs and spills
Pet food
Dirty dishes
Food residue on counters or floors
Open garbage
Food waste

Store vulnerable foods in suitable sealed containers, clean spills promptly, and avoid leaving pet food exposed longer than necessary.

Water and Moisture

Moisture can create favorable conditions for various household pests. Check for:

Leaking faucets or pipes
Plumbing problems
Condensation
Standing water
Damp basements or crawl spaces
Poor exterior drainage
Clogged gutters or downspouts

Fix the source of the moisture rather than simply drying the visible water. A dehumidifier can help manage excess humidity in appropriate spaces, but it does not replace plumbing, drainage, or building repairs.

Shelter

Homes contain many protected spaces where pests can hide or nest. These include wall voids, attics, basements, crawl spaces, garages, cluttered cabinets, storage boxes, and areas beneath appliances.

Keeping storage areas organized makes these locations easier to inspect and reduces places where pests can remain undisturbed.

Easy Access

Small openings can provide convenient entry routes. Check doors, windows, screens, foundation openings, utility penetrations, pipe openings, vents, roof areas, and garages.

Sealing appropriate openings is an important part of pest prevention, but the correct repair depends on the location and type of opening.

Common Household Pests

Different household pests leave different clues, and the correct response depends heavily on the pest involved. A quick identification check can help you determine where to investigate and whether the problem may require a specialized approach.

Not every pest requires the same response. Ants may be associated with food, moisture, or nesting sites, while rodent control requires attention to food sources and entry points. Termite evidence can involve concealed activity, so suspected termites deserve a different level of investigation.

This article provides an overview of common household pests. The Handy Vibes can build dedicated guides for individual pest problems, including identification, prevention, treatment options, and when to call a professional.

Cockroaches

Cockroaches often hide in dark, protected locations, especially where food and moisture are available. Inspect cabinets, areas under sinks, spaces behind appliances, plumbing areas, bathrooms, and kitchens.

Droppings, egg cases, and repeated sightings can provide useful evidence of ongoing activity.

Ants

Ants commonly appear near food and moisture sources. When you see a trail, follow it when practical and look for where the ants enter the building and where they travel afterward.

The appropriate response can vary by ant species and nesting location, so identification matters before choosing a treatment.

Rodents

Rodents can leave several types of evidence, including:

Droppings
Gnaw marks
Nesting material
Damaged food packaging
Grease or rub marks
Scratching or scurrying sounds

The CDC recommends measures such as sealing openings and removing food sources when preventing rodent infestations.

Termites

Termites can damage wood while remaining concealed from view. Potential signs include mud tubes, damaged wood, discarded wings, and other evidence of termite activity.

If you suspect termites, investigate the evidence rather than relying on visible insects alone.

Bed Bugs

Bed bugs are commonly associated with sleeping and resting areas. Inspect mattress seams, box springs, bed frames, furniture seams, and cracks near sleeping areas.

Possible evidence includes live insects, shed skins, blood spots, and fecal spotting.

Flies

Flies can indicate accessible food, waste, organic material, or moisture. Instead of focusing only on adult flies, look for the source of the activity.

Depending on the species, drains, garbage, food, and other organic material may deserve inspection.

Spiders

Spiders may be more noticeable where insects are plentiful because insects provide a potential food source. Inspect corners, garages, basements, storage areas, and exterior locations.

Reducing conditions that support insect activity can also help reduce some of the food sources available to spiders.

How to Tell If You Have a Pest Infestation

One isolated pest sighting does not automatically mean your home has an infestation. Repeated sightings, multiple pests, or recurring physical evidence provide stronger reasons to investigate.

Look for the following signs.

Droppings and Other Waste

Droppings can indicate rodents or certain insects. Check cabinets, pantry areas, wall edges, garages, attics, basements, and other areas where activity has been noticed.

Avoid direct contact with unknown droppings. Rodent-contaminated areas require appropriate cleanup precautions. CDC: Cleaning Up After Rodents

Gnaw Marks and Property Damage

Fresh gnaw marks can indicate rodent activity. Check food packaging, stored materials, wood, and other areas where unexplained damage appears.

Damage alone does not identify a pest, so look for additional evidence before deciding what treatment is appropriate.

Nests, Egg Cases, and Shed Skins

Nesting material can indicate rodents or other animals, while egg cases and shed skins can help identify certain insects.

Inspect quiet, protected spaces where pests are less likely to be disturbed. Multiple signs in the same area provide more useful information than a single unexplained object.

Unusual Sounds and Odors

Scratching, scurrying, or movement inside walls and ceilings can indicate animal activity, although sound alone cannot identify the pest.

Persistent unexplained odors can also justify further inspection. Consider the location, timing, and other physical evidence before drawing conclusions.

Live or Dead Pests

A live pest can provide useful identification information, and a dead insect may be equally useful. If identification is necessary, take a clear photograph or preserve the specimen safely rather than immediately discarding it.

Damaged Food Packaging

Rodents and some insects can damage stored food. Check packages for:

Holes
Chewed edges
Openings
Contamination
Droppings nearby

Discard food that has been contaminated by pests.

Grease or Rub Marks

Rodents can leave dark marks along frequently traveled surfaces. Check baseboards, walls, and narrow travel routes when rodent activity is suspected.

Repeated Pest Sightings

Repeated sightings deserve more attention than an isolated encounter. Record where and when you see the pest, because a pattern can help reveal its entry point, food source, nesting area, or preferred hiding place.

How to Prevent Pests in Your Home

The most practical approach to how to prevent pests in your home combines food control, moisture management, exclusion, sanitation, and property maintenance.

Store Food Properly

Keep food inaccessible to pests whenever practical. Dry goods should be stored in suitable sealed containers, while pet food and food waste should remain properly contained.

Also check pantry packages regularly and clean food residue from countertops, floors, and other preparation areas.

Keep the Kitchen Clean

Clean dishes, counters, floors, and food-preparation areas regularly. Pay particular attention to spaces beneath and behind appliances where crumbs, grease, and food debris can accumulate.

Manage Garbage

Use suitable garbage containers with secure lids and remove food waste regularly. Clean containers when spills or residue accumulate.

Fix Leaks and Control Moisture

Repair plumbing leaks promptly and inspect areas around sinks, toilets, water heaters, basements, crawl spaces, gutters, and downspouts.

Persistent moisture may require plumbing, drainage, waterproofing, or other building repairs rather than pest treatment alone.

Seal Cracks and Gaps

Inspect openings around doors, windows, pipes, cables, foundations, and other penetrations. Small gaps may be suitable for an appropriate sealant, while larger openings may require mesh, hardware cloth, or another physical barrier.

Do not block vents or openings that are necessary for safe building operation.

Maintain Screens and Doors

Damaged screens can make insect entry easier. Repair holes and check that screens fit properly, including basement windows and less frequently used openings.

For exterior doors, inspect weather stripping and the gap beneath the door. A suitable door sweep can help reduce some gaps.

Reduce Clutter

Clutter provides hiding places and makes pest evidence harder to detect. Organize storage areas and maintain enough access to walls, floors, corners, and other inspection areas.

Maintain Your Yard

Outdoor conditions can affect pest activity around the home. Manage standing water, yard debris, garbage, drainage problems, outdoor storage, and vegetation around the structure.

Store Firewood and Outdoor Materials Properly

Avoid creating large piles of material against exterior walls. Store firewood appropriately and keep outdoor materials organized so you can inspect behind and beneath them.

Keep Vegetation Away From the House

Trim vegetation that touches or heavily surrounds the structure. Maintain enough visibility around foundations, windows, doors, and other exterior areas to inspect for gaps and pest activity.

Inspect the Home Regularly

Routine inspections can help you notice problems earlier. During normal home maintenance, look for new cracks, moisture, damaged screens, droppings, food damage, nests, structural openings, and repeated pest activity.

How Do Pests Get Into Your House?

Pests commonly enter through doors, windows, cracks, utility openings, vents, garages, foundations, and roof areas. Finding these routes is an important part of how to keep pests out of your house.

Common Entry Points

Pay particular attention to:

Exterior doors and door frames
Window frames and damaged screens
Foundation cracks and openings
Plumbing and utility penetrations
Vents and other exterior openings
Garage-door edges
Roof, soffit, and attic openings
Gaps around pipes and cables

Do not seal an opening simply because it looks like a possible pest route. First determine whether it is actually being used and whether the opening serves a necessary building function.

How to Find Where Pests Are Entering Your Home

Use the location of pest activity as your starting point.

Start where you see activity

Follow trails or other physical signs when possible

Inspect nearby cracks and gaps

Check the exterior directly outside the affected area

Inspect doors, windows, vents, and utility penetrations

Seal confirmed entry points using an appropriate method

If wildlife may be inside an attic, wall, or another enclosed area, do not seal the opening blindly. Confirm the situation first so you do not trap an animal inside.

Home Pest Inspection Checklist

A room-by-room inspection makes household pest control easier to manage. You do not need specialized equipment for a basic inspection, although a flashlight can make dark areas much easier to examine.

Kitchen

Check:

Cabinets and pantry shelves
Under and behind appliances
Under the sink
Plumbing connections
Food-storage areas
Garbage areas
Baseboards and corners

Look for droppings, trails, damaged packaging, insects, moisture, and unexplained odors.

Bathroom

Inspect:

Under sinks
Around pipes
Drains
Plumbing penetrations
Cabinets
Cracks and gaps
Moisture-prone areas

Pay attention to recurring moisture rather than treating only the visible water.

Bedrooms and Living Areas

Check:

Baseboards
Windows
Furniture
Closets
Wall openings
Spaces behind or beneath furniture

For suspected bed bugs, inspect mattresses, bed frames, furniture seams, and nearby cracks carefully.

Attic and Basement

Look for:

Droppings
Nests
Moisture
Damaged wood
Entry openings
Disturbed materials
Unusual odors

These areas can reveal evidence that is not visible in occupied rooms.

Garage

Inspect
Garage-door edges
Corners
Cabinets
Stored materials
Food storage
Rodent signs
Exterior penetrations

Keep storage organized so walls and corners remain accessible.

Exterior

Walk around the property and inspect:

Foundation
Doors and windows
Standing water
Drainage
Vegetation
Cracks and gaps
Utility penetrations
Outdoor storage
Roof and attic access points

Exterior inspections can reveal potential problems before they become obvious indoors.

How Often Should You Inspect Your Home for Pests?

There is no universal inspection schedule for every property. Inspection needs vary with climate, property condition, pest history, moisture, housing type, vegetation, and the specific pest involved.

A practical approach is to combine routine observation with more deliberate monthly and seasonal checks.

During Normal Home Maintenance

Watch for obvious signs during cleaning, repairs, and other household tasks. Pay attention to repeated sightings, new damage, droppings, food contamination, unexplained odors, and moisture problems.

Monthly

Inspect vulnerable areas more deliberately, especially:

Under sinks
Storage areas
Garages
Exterior doors
Screens
Moisture-prone locations
Areas with previous pest activity

Seasonally

Use seasonal home maintenance as a pest inspection opportunity. Check exterior walls, foundations, drainage, vegetation, attic and roof areas, doors, windows, screens, and new cracks or gaps.

Pest activity varies by species and region, so local seasonal patterns matter.

Whenever You See Signs

Investigate pest evidence promptly rather than waiting for the next scheduled inspection. This is especially important when you find repeated activity, significant damage, or signs that suggest a larger problem.

How Pest Problems Vary by Region and Season

Pest activity is not identical across the United States. Climate, temperature, rainfall, vegetation, housing conditions, property age, moisture, and local pest species can all affect the types of problems homeowners encounter.

Seasonal activity also varies between pests and regions. Some insects become more noticeable during warmer periods, while rodents and other animals may seek shelter indoors when outdoor conditions change.

Instead of following a pest-control schedule designed for another part of the country, consider the conditions around your own property. Useful seasonal checks include:

Inspecting screens before warmer weather
Checking exterior gaps
Reviewing drainage after heavy rain
Checking attics and garages
Managing standing water
Inspecting stored outdoor materials
Watching for new pest activity after major weather changes

Local university extension programs can provide more specific information about pests common in your area.

DIY Pest Control vs. Professional Pest Control

DIY home pest control can be suitable for some minor, identifiable problems, particularly when the underlying source can be addressed. Professional pest control may be appropriate when activity persists, the problem is widespread, access is difficult, or the pest creates a significant property or safety concern.

When DIY Makes Sense

Start with practical measures that address the conditions supporting the pest. Depending on the situation, these may include sanitation, food storage, moisture control, sealing suitable entry points, traps, baits, monitoring, and removing accessible shelter.

For pesticide products, always follow the product label and use the product only as directed.

Where DIY Control Has Limits

DIY treatment becomes more difficult when:

The pest is unidentified
Activity keeps returning
The infestation is hidden
Pests are inside inaccessible spaces
Property damage is occurring
Multiple reasonable control attempts have failed
The situation creates a safety concern

Using more pesticide does not necessarily solve the problem. If pests still have access to food, water, shelter, or an entry point, activity may continue.

Common Pest Control Mistakes to Avoid

Good pest management depends on addressing the underlying problem and using control products correctly. Several common mistakes can make pest problems harder to manage.

Using Pesticides Before Identifying the Pest

Different pests require different approaches. Identify the pest before selecting a treatment whenever practical.

Applying More Product Than the Label Allows

More pesticide does not automatically mean better control. Follow the product label for application, location, amount, storage, and safety instructions.

Mixing Pesticides or Household Chemicals

Do not mix pesticides or household chemicals unless the product label specifically directs you to do so. Unexpected chemical reactions can create serious hazards.

Using Outdoor Pesticides Indoors

A product intended for outdoor use should not automatically be used inside. Use pesticides only in the locations and manner permitted by the product label.

Relying Entirely on Sprays

Spraying may address visible pests without fixing the underlying cause. Food, moisture, shelter, and entry points still need attention.

Ignoring Moisture Problems

Repeated pest activity around leaks or damp areas can continue if the moisture source remains. Fix the underlying water problem whenever possible.

Sealing an Opening Without Checking What Is Inside

Do not blindly seal an opening that may be used by wildlife or another animal. First determine whether something is inside and whether exclusion should be handled differently.

Treating Every Pest Sighting as an Infestation

An isolated pest does not automatically indicate an established infestation. Look for patterns and supporting evidence before escalating treatment.

Ignoring Recurring Activity

Temporary improvement is not the same as solving the problem. If pests return repeatedly, investigate the source, entry point, food supply, moisture, or nesting location.

Ignoring Product Instructions

Read the label before using a pesticide, trap, bait, or other pest-control product. Follow directions for placement, application, storage, disposal, and precautions.

Using Traps or Baits Without Considering Placement

Placement matters. Follow product instructions and keep traps or baits away from children and pets as directed.

When Should You Call a Pest Control Professional?

Consider professional help when pest activity continues despite reasonable prevention and control efforts. Professional evaluation can also be useful when the pest is difficult to identify, the infestation is widespread, access is difficult, or property damage is occurring.

Situations that may justify professional attention include:

Persistent pest activity
Widespread infestation
Suspected termite activity
Significant rodent activity
Difficult-to-access nests
Activity inside walls or ceilings
Significant property damage
Stinging insects creating a safety concern
Uncertainty about safe treatment
A situation you do not feel comfortable handling

Professional treatment is not automatically necessary for every pest sighting. When contacting a company, ask what pest they identified, what evidence they found, what treatment they propose, and what follow-up is included.

For structural, electrical, gas, roofing, or other hazards outside ordinary pest management, contact the appropriate qualified professional.

How Much Does Home Pest Control Cost?

There is no single nationwide price that accurately represents every pest-control job. Home pest control cost depends on factors such as pest species, property size, infestation severity, location, treatment method, number of visits, and service terms.

For that reason, compare the scope of work rather than looking only at the advertised price.

What Affects Pest Control Cost?

Common factors include:

Pest species
Property size
Infestation severity
Geographic location
Treatment method
Number of visits
One-time versus recurring service
Follow-up requirements
Warranty terms
Preparation requirements

A minor insect problem and a complex rodent exclusion project can involve very different services.

Questions to Ask Before Paying

Before hiring a company, ask:

What exactly is included?
Is this one-time or recurring service?
Are follow-up visits included?
Is there a warranty or guarantee?
What preparation is required?
Are there additional charges?
What happens if pest activity continues?
Which pests are covered?

Ask for the scope of work in writing when practical.

How to Choose a Pest Control Company

Choosing a pest-control company involves more than comparing the initial price. Homeowners should understand the pest, proposed treatment, service scope, follow-up plan, and safety requirements.

Check Licensing and Credentials

Pesticide applicator requirements vary by state. Check the appropriate state regulatory agency for licensing requirements and verify credentials where applicable.

Ask for an Inspection

Ask the company to explain what evidence supports the diagnosis. You should understand what pest they identified and where they found evidence.

Ask What Treatment Is Proposed

Ask about:

Treatment method
Areas being treated
Products being used
Follow-up visits
Preparation
Safety instructions
Expected results

You should understand the proposed service before agreeing to it.

Understand Follow-Up Visits

Some pest problems require monitoring or additional treatment. Ask when follow-up is recommended and whether it is included in the quoted service.

Compare Quotes Based on Scope

Two quotes may cover different services. Compare inspection, treatment, follow-up, warranty terms, covered pests, preparation, and exclusions rather than comparing only the headline price.

Ask About Guarantees

If a company offers a warranty or guarantee, ask exactly what it covers. Check its duration, exclusions, response process, and any additional fees.

Ask About Home Preparation

Some treatments require preparation. Ask whether you need to:

Remove or cover food
Secure pets
Cover or remove certain items
Leave a treated area
Make other changes before treatment

Request written instructions when possible.

Understand Safety Instructions

Follow the company’s instructions and the pesticide label. Keep children and pets away from treated areas whenever required by the product label or service instructions.

Simple Home Pest Prevention Routine

A simple routine makes pest prevention easier to maintain without turning pest control into a daily chore.

Weekly

Clean food spills
Check garbage areas
Store exposed food
Look for visible pest activity
Remove accessible standing water

Monthly

Check exterior entry points
Inspect under sinks
Check storage areas
Look for droppings and damage
Inspect screens and door seals
Check recurring moisture areas

Seasonally

Inspect the home’s exterior
Check attic and roof areas
Review drainage
Maintain vegetation
Look for new cracks and gaps
Check stored outdoor materials
Reinspect areas with previous pest activity

Whenever You See Signs

Do not ignore recurring activity. Identify the pest, locate the likely source, remove attractants, address suitable entry points, and monitor the results.

Recommended Pest-Control Tools for Homeowners

The most useful pest-control products depend on the problem you are trying to solve. Instead of buying a large collection of products, choose tools that support inspection, prevention, monitoring, or targeted control.

For Inspection

Useful inspection tools include:

Flashlights: Help illuminate dark cabinets, garages, attics, basements, and corners
Inspection mirrors: Help inspect behind pipes, appliances, and other difficult locations
Moisture meters: Help identify areas that may need further moisture investigation
Inspection cameras: Help view certain hard-to-reach spaces

These tools support inspection but do not replace professional diagnosis when the problem is complex.

For Sealing Entry Points

Common exclusion supplies include:

Door sweeps: Help reduce suitable gaps beneath exterior doors
Window screens: Help limit insect entry when properly fitted
Caulk and sealant: Can close appropriate small gaps
Metal mesh or hardware cloth: Can help close certain larger openings

Choose materials based on the location and building condition. Do not block required ventilation or other building components.

For Monitoring and Control

Depending on the pest, homeowners may use:

Pest monitors: Help detect activity in selected locations
Mouse traps: Provide targeted rodent control when used correctly
Insect traps: Help monitor or reduce certain insects
Ant bait stations: Can be useful when the bait is appropriate for the identified pest
Roach traps: Help detect cockroach activity

Always follow product instructions and consider children and pets when deciding where these products can safely be placed.

For Food Storage and Moisture Control

Helpful household products can include:

Airtight food containers: Help limit pest access to stored food
Secure garbage containers: Help reduce access to food waste
Leak detectors: Can provide alerts for certain water leaks
Dehumidifiers: Can help manage excess humidity in appropriate spaces

These products work best as part of a broader home pest prevention strategy rather than as standalone solutions.

Final Thoughts

Effective home pest control follows a practical cycle: identify, inspect, prevent, monitor, and treat. Start by identifying the pest and investigating where it is active. Then remove accessible food and moisture sources, address suitable entry points, and monitor for recurring signs. Minor problems may respond to practical DIY measures, while persistent, widespread, damaging, or inaccessible problems may require professional evaluation. The goal is not to treat every surface in your home, but to understand why pests are present and address the conditions that allow them to remain.

Frequently Asked Questions

What attracts pests to a home?

Food, water, shelter, warmth, clutter, and accessible openings can support household pest activity.

How do I know if I have a pest infestation?

Look for repeated sightings, droppings, nests, damage, odors, gnaw marks, or recurring physical evidence.

How can I prevent pests from entering my house?

Store food securely, control moisture, reduce clutter, maintain screens, and seal suitable entry points.

How do pests get into homes?

Pests commonly enter through doors, windows, cracks, vents, utility openings, garages, foundations, and roof gaps.

How do I find where pests are entering my home?

Start near pest activity, follow signs, and inspect nearby openings, doors, windows, vents, and utility penetrations.

Is DIY pest control effective?

DIY methods can work for some minor problems when the pest is correctly identified and the chosen treatment is appropriate.

When should I call a pest control professional?

Consider professional help when activity persists, the problem is widespread, identification is uncertain, or property damage or safety concerns exist.