German cockroaches favor warm, humid spaces near food and water — kitchens, behind appliances, under sinks — and Dekalb's a humid continental climate with hot, humid summers, cold and often harsh winters, and significant lake-effect influence near Lake Michigan keeps them active most of the year. American cockroaches, larger and reddish-brown, prefer basements, drains, and utility rooms. A blend of dense urban multi-family buildings and single-family suburban homes, nearly all with basements given the region's cold winters.
Because sanitation and moisture are almost always part of the problem, our process pairs targeted gel-bait treatment with a review of what's drawing roaches in — a leak, exposed food storage, cluttered voids. Broadcast sprays just scatter a colony; bait placed at the harborage site eliminates it. A follow-up visit confirms results.