With any ant infestation problem, one of the key steps to removing the ants is locating their nest. Ants' nests can be formed in just about any location but with a little bit of practice, and a lot of observation, you can become adept at finding nests in and around your home. In just a few days of searching you can uncover most of the major nests that are housing the little creatures that are invading your home.
Watch the ants for any noticeable trails. Many times they will give away the location of their nests.
Look around dark areas near water sources, such as in kitchens and bathrooms. These are areas favored by interior ants, which like to nest behind baseboard and tiles, as well as in spaces between walls.
Look for fresh piles of sawdust around the interior or exterior of your home for carpenter ants. These piles are usually signs of a nest's entrance. Tap along walls, listening for any hollow points which also indicates the location of carpenter ants.
Walk around the exterior of your home and look for any dirt mounds with ants coming and going. This is an in-ground ant nest.
Check under your home as ants also can live under rock beds or concrete slabs. They can be found by watching for trails of ants coming out of these areas.