Ants are among the most common household pests in Singapore, and they remain active throughout the year. The tropical climate sustains colonies well-fed and mobile, while the density of HDB living means a nest in a neighbouring unit or common corridor can become your problem within days.
Most infestations start with a few scouts. Once you see a trail, the colony has already found a way to food or water in your flat. But how to get rid of ants effectively?
Causes of Ant Infestation At Home
Ant infestations are driven by specific environmental attractants that turn a single foraging scout into a persistent structural issue. Some of these include:
1. Food and Water
Ants are opportunistic feeders. They consume carbohydrates, proteins, fats and sugar, which means almost anything in a kitchen or pantry is a potential target. Crumbs under the toaster, grease residue on the hob, a loosely sealed container of biscuits, or a bowl of pet food left out overnight are all enough to draw scouts in. Once a scout locates a source, it leaves a pheromone trail on the way back to the colony. Other ant workers follow that trail, and what starts as one ant becomes dozens immediately.
Moisture is a separate but equally significant draw. Identifying the source of a leak is the first step to getting rid of the conditions that sustain ants over the long term. Leaking pipes under the sink, condensation behind appliances and damp grout in bathrooms all provide water ants need to survive. In Singapore’s humidity, even small sources of standing water are sufficient. Ghost ants, one of the most common species in HDB flats, are particularly drawn to moist environments and typically nest inside wall cavities or behind kitchen cabinets.
2. Nearby Colonies
Even a well-maintained home is not immune to infestation. When a colony is established in the wall void of an adjacent unit or in the soil of a common garden area, worker ants forage outward and enter nearby homes through the smallest gaps. This is a recurring issue in HDB blocks and older condominiums, where shared walls and ageing infrastructure provide ample entry points. Treating your own unit without addressing the source often results in the infestation returning.
3. Weather
Singapore’s wet season increases ant activity indoors. During heavy rain, ground-level colonies are disrupted, and workers relocate to drier ground, including through drainage pipes, window frames and the gaps around utility conduits. During dry spells, ants move inside to find water. Either way, weather events often coincide with a sudden spike in sightings, regardless of how well-maintained a property is.
How to Get Rid of Ants at Home
Several accessible methods can stop ant activity in your house. These are worth trying for minor or early-stage infestations. Their effectiveness varies depending on the type of species and how big the colony is.
1. Natural Ant Repellents
Peppermint oil, white vinegar and citrus peels are the most commonly used natural options.
- A diluted solution of equal parts water and white vinegar, applied along skirting boards and countertops, interrupts scent trails without leaving harmful residue.
- Citrus peels contain D-limonene, a compound toxic to ants on contact.
- Peppermint oil mixed with water in a spray bottle can be applied around entry points, windowsills and doorframes.
These methods work best as deterrents along foraging routes. They are not effective at eliminating an established colony, but are suitable for households with young children or pets, given their low chemical risk.
2. Household Solutions
Common household items can be used against active trails or as surface-level deterrents:
- Baking Soda and Sugar Mixture: The sugar draws ants and disrupts their digestive systems once ingested. This mixture should be kept away from pets and small children.
- Food-Grade Diatomaceous Earth: Applied as a thin barrier along entry points, behind appliances or along skirting boards. It works by dehydrating ants on contact and is non-toxic to humans and animals in normal use.
- Table Salt Dissolved in Water: Sprayed along active foraging routes, it can deter ants without eliminating the colony. Useful for disrupting an active trail while longer-term measures are being put in place.
3. Physical Barriers
Use chalks or silicone sealant as physical barriers:
- Chalk lines and cornstarch act as temporary physical barriers by disrupting the surface ants travel on. They need frequent reapplication in humid conditions and are more practical in enclosed spaces than open areas.
- Sealing entry points with silicone sealant or caulk provides a more durable solution. Common entry points include gaps around pipes, cracks near skirting boards and poorly fitted window frames.
4. Ant Baits and Gels
Of all the DIY methods, ant bait is the most likely to reduce colony numbers rather than just deter foraging workers.
- Slow-acting toxicant mixed with an attractant is carried back to the nest by workers and shared with other colony members, including the queen.
- Bait is the appropriate method for Pharaoh ant infestations.
One important note: for Pharaoh ants, a species found in homes and healthcare settings across Singapore, repellent-based sprays should be avoided. Spraying causes the colony to split and disperse, making the infestation significantly harder to treat. If you are uncertain which species you are dealing with, professional identification before treatment is advisable.
How to Get Rid of Ants Effectively
DIY methods manage ant activity at the surface level. Effective control requires addressing the conditions that make a home attractive in the first place.
Store Food Properly
Accessible food is the primary reason ants stay. A few consistent habits remove that draw:
- Keep all food, including dry goods such as cereals, grains and sugar, in airtight containers.
- Cover or refrigerate ripe fruits left on the counter.
- Empty and wash pet food bowls after each meal.
- Use a rubbish bin with a tight-fitting lid and empty it daily.
Keep Your Home Clean
Wiping down surfaces after cooking, sweeping crumbs from floors promptly and cleaning behind and under appliances regularly removes the food traces that attract ants. Pay particular attention to how you clean certain areas, such as behind the fridge, under the microwave and around the hob, as these can accumulate grease residue that is easy to overlook. Bathroom drains and floor traps should also be kept clear.
Seal All Entry Points
Check the perimeter of your flat, including areas around pipe penetrations in the kitchen and bathroom, gaps behind skirting boards, cracks in walls and the condition of window seals. Silicone sealant is appropriate for gaps around pipes and plumbing. Weather stripping addresses gaps under doors, while fly screens on windows add additional protection against foraging ants entering from outside.
If you live in an HDB flat and ants continue to return despite these measures, the source may be a neighbouring unit or shared common area. Raising the issue with your Town Council or building management may be necessary to ensure the space is treated alongside your own unit.
Engage a Pest Control Company
For many households, a combination of the above measures is sufficient to keep ants away. When infestations persist despite consistent effort, when the species is difficult to identify, or when you suspect the colony is nesting inside walls rather than entering from outside, professional treatment becomes the more practical option.
How to Keep Ants Away: Professional Ant Control is the Solution
The core limitation of DIY ant control is that most surface treatments never reach the colony. You may eliminate the foraging workers you can see, but the queen and the bulk of the colony remain protected. As long as the queen survives, the colony continues to produce replacements. This is why infestations appear to resolve, only to return within days or weeks.
Thorough Inspection
Professional pest control begins with species identification. The treatment approach for ghost ants differs from that for carpenter ants, fire ants or Pharaoh ants. A licensed ant control specialist identifies the species, locates nesting areas and maps entry points. Without this groundwork, treatments target what is only visible, not the source.
Targeted Treatment
A licensed ant exterminator in Singapore must be registered with the National Environment Agency (NEA). Pest management specialist applies treatments approved for residential and commercial settings. For ant control, this typically involves gel bait placement in targeted locations, residual treatment around the perimeter, and void treatments where colonies are nesting inside walls or ceiling cavities.
Treatments are applied based on the specific species and infestation pattern rather than as a blanket spray. This reduces unnecessary chemical exposure while improving the likelihood that treatment reaches the colony rather than just the foraging trail.
Preventive Measures and Follow-Up
Beyond treatment, a professional ant exterminator identifies the structural and hygiene conditions sustaining the infestation. They can advise on how to prevent ants at your home, such as specific entry points to seal, moisture issues to address and areas that require monitoring. Follow-up visits allow the ant control specialist to assess treatment effectiveness and apply additional measures if needed.
Persistent infestations, or those involving carpenter ants that can damage wooden fixtures and structural timber, benefit significantly from an ongoing monitoring programme rather than a single one-off treatment.
Get Rid of Ants With the Help of PestMan
PestMan is an NEA-registered pest control company serving residential, commercial and institutional clients across Singapore. Our ant control service covers species identification, targeted treatment and follow-up assessment, with treatments carried out by licensed technicians using NEA-approved methods.
For households dealing with recurring infestations or species that have not responded to DIY treatment, PestMan provides a structured approach focused on the colony rather than the trail. Contact us today to arrange an assessment.