German cockroaches favor warm, humid spaces near food and water — kitchens, behind appliances, under sinks — and Granite Bay's an inland valley climate far hotter in summer and foggier in winter than California's coastal regions keeps them active most of the year. American cockroaches, larger and reddish-brown, prefer basements, drains, and utility rooms. Housing spans historic agricultural-town homes to newer suburban subdivisions around the valley's larger cities.
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.