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    Plumbing Code Adoption

    Arizona Plumbing Code: International Plumbing Code 2018

    Arizona follows International Plumbing Code 2018 as the basis for plumbing work. Permits and inspections are issued by the local Authority Having Jurisdiction (AHJ), which may publish additional amendments.

    Adoption details

    Model code family
    IPC / UPC
    Adopted edition
    International Plumbing Code 2018
    Last verified
    2026-05-29

    Note: No statewide plumbing code — adoption is local. Many jurisdictions use the IPC; verify with the AHJ.

    Related resources for Arizona

    Frequently Asked Questions

    What plumbing code does Arizona use?

    Arizona currently follows International Plumbing Code 2018 for plumbing work. Always confirm the in-force edition with the local Authority Having Jurisdiction (AHJ) — county or city amendments can apply.

    Do I need a permit for plumbing work in Arizona?

    Most plumbing work in Arizona — including new installations, system replacement, and gas-fueled appliance hookups — requires a permit from the local building department and an inspection at completion. Homeowner permits are typically allowed for owner-occupied residences; commercial work requires a licensed contractor.

    Where do I check Arizona plumbing code amendments?

    Local jurisdictions (city or county) often publish amendments on the state's building-codes board website or in the municipal code. The current International Plumbing Code 2018 text is published by its model-code body (ICC, IAPMO, or NFPA depending on the trade).

    Are there any unusual plumbing requirements in Arizona?

    No statewide plumbing code — adoption is local. Many jurisdictions use the IPC; verify with the AHJ.

    Reference guidance only — adoption editions and local amendments vary by city or county. Always confirm requirements with your local Authority Having Jurisdiction (AHJ) before designing, permitting, or constructing.

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