German cockroaches favor warm, humid spaces near food and water — kitchens, behind appliances, under sinks — and Lake Delton's a continental climate where both summer warmth and severe winter cold define the year, more so in the north than the south keeps them active most of the year. American cockroaches, larger and reddish-brown, prefer basements, drains, and utility rooms. Housing here ranges from historic dairy-farm homes to newer lake-country cabins, with basements standard throughout.
Treatment starts with locating the harborage points — the tight, warm, food-adjacent spaces roaches actually live in — and applying gel bait directly there rather than spraying open floor space. This targets the colony at its source and avoids the resistance issues that plague over-the-counter sprays. We follow up to verify the population has collapsed, not just scattered.