When Should I Call Pest Control for Rats?

Because rats are nocturnal, a rat seen in daylight typically means the population has grown large, food is scarce, or animals are stressed — Texas A&M School IPM treats repeated daytime sightings as a marker of a sizeable infestation. Multiple sightings, or droppings appearing in more than one area of the home, indicate the problem is spreading rather than confined to a single spot.

Fresh burrow openings about 2–3 inches wide along a foundation are physical evidence of an established, breeding population, not a single passer-through. Structural or wiring damage raises the stakes further — beyond the infestation itself, chewed wiring is a fire-safety concern. Either of these is a legitimate reason to escalate immediately, regardless of how the DIY effort has gone so far.

If you've trapped and sanitized conscientiously for about two weeks and still see fresh droppings, new gnawing, or continued activity, the infestation likely extends into wall voids or other inaccessible areas that need professional inspection and exclusion. As Orkin notes, traps handle individual animals but "will not prove effective in the face of an infestation" — a real colony needs a structured, layered program rather than more of the same traps.