Pest Library
Ants
Trails in the kitchen, along baseboards and around foundations.
Overview
Most ant calls in the Hudson Valley start the same way: a thin line of small dark ants moving along a counter edge, a windowsill or the seam where the floor meets the wall. The ants you see are foragers — usually a small fraction of a colony nesting somewhere else, often outdoors under a slab, stone or mulch bed.
Common household ants in this region include pavement ants, odorous house ants, little black ants, and the much larger carpenter ants. Size, color and behavior all help narrow it down, and the difference matters: pavement ants are a nuisance, while carpenter ants are a structural concern.
Why they're common in the Hudson Valley
- Properties here often combine mature trees, stone walls, mulch beds and moisture-holding soil — ideal nesting conditions right against a foundation.
- Older homes with fieldstone or block foundations, and newer homes with expansion joints in slabs and patios, both give ants direct paths from soil to interior wall voids.
- Spring rain followed by warm weather pushes colonies to expand and forage, which is when most homeowners first notice indoor trails.
Signs of activity
- Steady trails of ants following the same route, often to a food or water source
- Ants appearing after rain or during the first warm stretch of spring
- Small piles of soil or fine debris at slab cracks, patio joints or foundation seams
- Winged ants indoors, which can indicate a mature colony nearby
Where you'll find them
- Kitchens: near sinks, dishwashers, pet bowls and pantry shelves
- Bathrooms: around tubs, toilets and plumbing penetrations
- Basements: along sill plates and foundation walls
- Outside: under pavers, stone walls, mulch, firewood and landscape timbers
Why it matters
- Most household ants are a nuisance and a food-contamination concern rather than a health hazard.
- Persistent indoor trails usually mean there is a reliable moisture or food source — and sometimes a plumbing leak worth finding.
- Large black ants indoors during winter can indicate a colony already living inside the structure, which is a different and more urgent situation.
Prevention
- Wipe trails with soapy water to remove the chemical trail other ants follow
- Store sweets, pet food and produce in sealed containers
- Fix dripping faucets and slow leaks under sinks
- Keep mulch, soil and firewood pulled back from the foundation
- Seal gaps around pipe penetrations, door thresholds and window frames
When to get an inspection
- Trails return within days of cleaning and treating with store-bought products
- You are seeing large black ants, sawdust-like shavings, or winged ants indoors
- Ants are appearing in more than one room, or in an upper floor bathroom
- You suspect a hidden moisture problem behind a wall or under a slab
Ant trails you can't get rid of?
If the activity keeps coming back, an on-site inspection is the reliable next step.