Subterranean termites (Reticulitermes and Heterotermes species) are the most destructive pest in Arizona — responsible for more than $5 billion in structural damage nationwide each year, and a constant threat to homes throughout the Phoenix metro and Pinal County. Unlike drywood termites, which infest wood directly, subterranean termites live in underground colonies that can contain hundreds of thousands to over a million workers. They travel through the soil and build distinctive mud tubes to reach the wood in your home's framing, subfloor, and walls. Because they work from the inside out, homeowners often don't discover an infestation until significant structural damage has already occurred.

How Subterranean Termites Enter Arizona Homes

Arizona's warm climate and irrigated landscapes create near-perfect conditions for subterranean termites year-round. The desert Southwest is home to several species — most commonly the Western subterranean termite (Reticulitermes hesperus) and the arid-land subterranean termite (Reticulitermes tibialis) — both of which thrive in the moisture-rich soil around irrigated lawns, drip systems, and leaking pipes. Subterranean termites require contact with soil moisture to survive, which is why any condition that keeps soil near your foundation wet — overwatering, poor drainage, or plumbing leaks — dramatically increases your risk. Homes built on slab foundations are not immune: termites enter through expansion joints, utility penetrations, and cracks in the slab as thin as 1/32 of an inch.

Prevention & Professional Treatment

Protecting your Arizona home from subterranean termites requires a professional-grade approach. Liquid termiticide barriers (Termidor SC, Altriset) applied to the soil around and beneath the foundation create a treated zone that kills termites on contact and through secondary transfer. Termite bait systems (Sentricon, Advance) intercept foraging workers and deliver a slow-acting toxicant back to the colony, eventually eliminating the queen. Annual professional inspections are the single most important step Arizona homeowners can take — catching an infestation early can mean the difference between a $1,000 treatment and a $20,000 structural repair. Pest Control Bros LLC provides free termite inspections throughout Maricopa, Chandler, Mesa, Tempe, Gilbert, and Casa Grande. Call (520) 424-5244 for same-week service.