Why Are There Ants in My Dishwasher? A Texas Pest Expert Explains

If you’re asking, “Why are ants in my dishwasher?” you’re not alone. Finding ants in dishwashers is, unfortunately, common in Texas. High temperatures, drought and rain can push nearby colonies indoors, and those colonies are attracted to the moisture, warmth and food residue in your dishwasher. 

For deeper insight into ant behavior, we interviewed Alan Brown, entomologist and Technical Director at Chem-free. He has a degree in entomology from Texas A&M and is a board-certified entomologist. 

Here’s what to know about this issue and what you can do about it.

Why Are Ants Getting Into Your Dishwasher?

Ants are small enough to squeeze into places you’d never expect.

Ants haven’t found their way into your dishwasher by chance. Several key factors drive ants toward dishwashers, including:

• Moisture and condensation attract ants
• Hidden food residue inside the dishwasher
• Plumbing openings give ants easy access
• Seasonal Texas ant behavior

Ants can enter through plumbing, cabinet gaps and wall voids. Once scout ants from the colony have found the dishwasher, they’ll alert worker ants, creating a bigger issue.

Moisture and Condensation Attract Ants

Water draws in ants more quickly than crumbs. This is particularly true during Texas droughts. Dishwashers retain moisture after wash cycles, especially around the filter, drain and door seal. Even a small water source can attract ants from outdoors.

Hidden Food Residue Inside the Dishwasher

Your dishwasher may look clean, but it likely has some level of grease film and food particles hanging around. Debris accumulates in the filter, under the bottom racks or around the drain. The standing water and food material are just what ants look for.

Plumbing Openings Give Ants Easy Access

Ants can work their way inside around plumbing. Pipe penetrations in walls, gaps under sinks, wall voids and drain line access all have the potential for tiny gaps. Ants don’t need much space to squeeze through.

Seasonal Texas Ant Behavior

Texas ant problems are tied to seasonal behavior. Foraging in spring and summer drives ants to explore, and even a mild drought can have them seeking out moisture indoors. Heavy rain and flooding can disrupt outdoor nesting sites, further pushing ants indoors.

What Type of Ants Are Commonly Found in Dishwashers?

Not every ant in your kitchen is the same species, and identifying which one you’re dealing with matters for treatment.

Here’s a closer look at each species.

Rover Ants 

Rover ants, pictured above, are very small, light to dark brown ants that are easy to mistake for other small household species. They’re drawn to moisture, which makes dishwashers, sinks and other damp areas an ideal spot for them. Since they nest in soil, mulch and other moist spots near the foundation, they don’t have far to travel to find their way inside.

Pharaoh Ants

Pharaoh ants, pictured above, are another small species of ant. These are very challenging to deal with, as applying sprays can cause colonies to split and spread to new areas. Baiting is typically the most effective strategy, but you’ll need to identify the species first. There are many similarities between pharaoh ants and fire ants.

Odorous House Ants

Small, dark ants are often odorous house ants, pictured above. The name comes from the odor they give off if crushed. You can find them around sinks, counters and dishwashers. They look for sweet residue, so many homeowners call them sugar ants in kitchens. However, there are other household black ant species that they may be confused with.

Argentine Ants 

Argentine ants, pictured above, are light to dark brown and tend to travel in long, visible trails rather than scattering randomly. They’re especially drawn to sweets and moisture, which puts kitchens and dishwashers high on their list. Argentine ant colonies can grow large fast, and they’re known for pushing out other ant species when they move into an area.

Fire Ants 

Fire ants, seen in the photo above, are reddish brown and easy to identify by their aggressive behavior and often painful sting. They typically nest outdoors in mounds, but they’ll forage indoors for food and water when conditions push them indoors. Fire ants are one of the few cases where a repellent product makes sense over baiting alone.

Ghost Ants

Ghost ants, pictured above, get their name from their pale, almost see-through legs and abdomen paired with a dark head, which makes them tricky to spot on light-colored surfaces. They’re especially attracted to sweet foods and moisture, both of which a dishwasher provides. They often nest in wall voids or potted plants, so a few ghost ants in the kitchen can mean a colony is close by.

How to Get Rid of Ants in Your Dishwasher

Generally, you’ll want to follow these six steps:

1. Empty and inspect the dishwasher
2. Clean the dishwasher thoroughly
3. Follow the ant trail
4. Seal entry points
5. Reduce moisture sources

This thorough approach can help you get back to enjoying your dishwasher as usual.

Step 1: Empty and Inspect the Dishwasher

Empty your dishwasher of any dishes and remove any racks. Look closely around the filter, drain area and corners. Standing water, food debris and concentrated ant activity are all things to look for.

Step 2: Clean the Dishwasher Thoroughly

Wipe down surfaces prone to residue buildup. Take the filter out and clean it according to the manufacturer’s instructions. Running a cycle with vinegar can help remove film, and baking soda will deal with odors. Don’t forget to clean the surrounding surfaces and around the appliance.

Step 3: Follow the Ant Trail

Now, you’ll want to determine where ants are coming from. Watch how ants travel to see where they’re going. Ants work their way along baseboards and into cabinets, so check there, too. They could also work their way to adjacent rooms and carpeted areas.

Step 4: Seal Entry Points

Apply silicone caulk around pipe gaps, cabinets and any other small openings you find. Replace any worn weather stripping and check that utility entries around your home’s exterior are still sealed.

Step 5: Reduce Moisture Sources

Ants are attracted to sources of moisture. Check around the dishwasher and kitchen for leaking valves, clogged drain lines and humidity in under-sink cabinets. Any standing water can be inviting for ants and should be resolved.

What NOT to Do When You Find Ants in Your Dishwasher

Avoid spraying any pesticides inside your dishwasher, as you can contaminate your dishes. Bleach and other cleaners also pose concerns, and won’t address underlying problems. It’s also important not to ignore recurring sightings. You’re often better off calling in professionals than with DIY methods found online.

When DIY Methods Aren’t Enough

You may need professional pest control if you notice these signs:

• Ants returning within days
• Multiple kitchen locations
• Visible outdoor trails
• Recurring seasonal infestations
• Moisture damage indicators

Professionals will first thoroughly inspect your kitchen and property to identify the species. Checking moisture and other factors helps them build a targeted treatment plan. This will likely include dealing with access points and attractants. Exterior barrier treatments can be effective at keeping ants out of your home entirely.

How Texas Homeowners Can Prevent Future Ant Infestations

The climate in Texas makes ants a persistent issue for many homeowners. Effective prevention requires understanding what ants are looking for and how they get into your home. From there, you implement a strategy to keep ants out of your kitchen for the long term.

Kitchen Prevention Tips

Clean counters and other surfaces to avoid any sweet residue. If it takes a while to load up your dishwasher, make sure to rinse off any food first. Running your sink’s garbage disposal regularly will prevent larger pieces of food that could attract ants. The dishwasher filter is also liable to trap residue, so clean it regularly.

Exterior Prevention Tips

Trimming back vegetation from exterior walls makes it harder for ants to work their way into your home. You’ll also want to avoid direct mulch contact with the walls or foundation. Seal any utility penetrations thoroughly, as ants can work their way in through practically invisible gaps.

Plumbing Maintenance

Even slow leaks can attract ants, so deal with them promptly. Inspect under sinks for humidity, condensation and water stains. Monitor your dishwasher drain lines for any signs of clogs or seepage that will keep food residue around and draw in ants.

Frequently Asked Questions About Ants in Dishwashers

Take Action to Prevent Ants in Dishwashers Today

Ants in dishwashers are a symptom, not a root problem. Addressing moisture, food residue and access points can go a long way, and early intervention can prevent a bigger infestation. 

If ants are returning to your dishwasher or kitchen despite these measures, schedule an inspection to uncover hidden nesting areas today. Chem-free has been providing pest control services since 1990, and can help get your ant problem under control.