Cockroaches need three things to establish a colony: food, water, and warmth. Congress's housing stock gives them exactly that. A mix of older mining-era homes, mid-century ranch houses, and newer construction on wooded or high-desert lots, often with basements or crawl spaces unlike the low desert. Combined with Congress's climate — a transitional climate between the low desert and the mountains — real winters, warm but not brutal summers, and enough elevation to matter — 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.