Cockroaches need three things to establish a colony: food, water, and warmth. Gresham's housing stock gives them exactly that. Wood-frame farmhouses and ranch-style homes dominate, nearly all built with basements given the region's cold winters. Combined with Gresham's climate — a climate shaped by its position on the Great Plains, with wide temperature swings between summer and winter — indoor cockroach pressure rarely lets up on its own.
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.