A large portion of Tempe's housing stock was built between 1950 and 1980 — the decades when asbestos was actively added to building materials for its fire resistance, durability, and insulating properties. Popcorn and acoustic ceiling texture, vinyl floor tile and the mastic beneath it, plaster systems over lath, pipe insulation, and drywall joint compound from that era all have documented histories of asbestos content. The materials aren't dangerous until they're disturbed. In a house untouched since 1972, intact positive-testing materials would often sit harmlessly for decades more.
The problem in Tempe is that those houses are being touched constantly. Tempe's ASU-adjacent neighborhoods hold a dense concentration of investor-owned rentals and student-occupied properties — homes turned over, renovated on tight budgets, and sometimes DIY-remodeled between tenants by owners who don't know what the ceiling texture contains. Dry-scraping a popcorn ceiling is the most common asbestos exposure event we see. The scraper doesn't know, the owner often doesn't know, and the dust settles into carpets, ductwork, and the HVAC system before anyone tests. The right sequence is test, then remove.
If you're a landlord, property manager, or investor working in Tempe's older housing stock, the regulatory picture adds a layer that doesn't apply to an owner-occupant doing work in their own home. Arizona regulates asbestos through ADEQ alongside federal NESHAP, and those requirements scale with the amount of material disturbed and the building type. A licensed abatement contractor handles notification, compliant work practices, and waste disposal — so navigating the regulatory chain isn't on you to manage alone.