Cockroaches need three things to establish a colony: food, water, and warmth. Rio Rico's housing stock gives them exactly that. A mix of older adobe and block-construction homes near town centers with newer stucco-and-block subdivisions on the outskirts, plus manufactured housing common in rural stretches. Combined with Rio Rico's climate — a borderlands desert climate that runs a few degrees cooler than the low desert to the north, but still sees a real monsoon season — 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.