Pavement ants are small ants about 1/8th inch long and dark brown to black in color. They are found throughout the US and are a major pest in many areas. The name for this ant comes from its habit of nesting under sidewalks and driveways and piling dirt removed from the nest, in a mound, on top of the pavement.
In addition to nesting under sidewalks, pavement ant colonies can be found under other items lying on top of the ground, including stones, logs, boards, bricks, and patio blocks. They may nest in open soil close to building foundations or under mulch in landscaped beds. Only rarely do the ants nest indoors in walls, under floors, or in insulation.
Control of pavement ants should begin with an attempt to locate the nest site. Ants entering buildings from outdoors can be discouraged by sealing as many cracks and gaps in exterior walls as possible. Also, correct poor foundation drainage and repair water leaks.