Cockroaches need three things to establish a colony: food, water, and warmth. Azusa's housing stock gives them exactly that. Housing spans decades of Southern California suburban growth, from 1950s tract homes to current new-construction communities. Combined with Azusa's climate — a mild climate overall, though inland valleys run noticeably hotter than beach communities just a few miles away — 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.