Plumbing and HVAC rules in Arizona

In Arizona, a plumbing business is licensed by the Registrar of Contractors under a plumbing classification: C-37 for commercial, R-37 for residential or CR-37 for both. There's no separate state card for journeyman plumbers.^{1, 2, 3}

A heating and cooling business in Arizona holds a Registrar of Contractors classification for air conditioning and refrigeration (C-39, R-39 or CR-39) or for comfort heating (C-58).^{1, 2, 3}

Your local building department can tell you which plumbing and mechanical codes apply where you live.

Ask your local building department whether replacing a water heater, furnace or AC needs a permit where you live.

If your home has a backflow preventer, your water utility can tell you whether it needs testing and who can test it.