Maricopa County (unincorporated) Plumbing Codes and Permits

Every Maricopa County (unincorporated) plumbing rule we cover, sorted by topic. Each page says what the rule means and links to the official Maricopa County (unincorporated) source.

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Maricopa County (unincorporated) Plumbing Codes and Permits

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Adopted plumbing and gas codes: 2018 International Plumbing Code and 2018 International Fuel Gas Code (with 2018 IBC, IRC, IMC, IEBC and 2017 NEC), adopted by the Board of Supervisors on 17 August 2022 with AZBO/MAG amendments and county Local Additions and Addenda. The county uses the IPC and IFGC, not the UPC.
Where the code is hosted: County Local Additions and Addenda (2022 version) PDF on maricopa.gov. The county says it cannot post the ICC codes themselves because they are copyrighted.
Permit portal: Maricopa County Permit Center (Planning and Development and Environmental Services applications, plan review, inspections and payments)
Planning and Development: 301 W. Jefferson St., Phoenix; main line 602-506-3011; inspection call center 602-506-3301
Restaurant plan review (plumbing and health): Environmental Services Plan Review Construction Guide for food establishments (Rev 09/04/2026); the county Environmental Health Code (Rev 08/19/2026) covers unincorporated areas and cities and towns that request Environmental Services

Permits and Inspections

Permits and Inspections in every city

City CodeVerified Oct 2026Maricopa County Local Additions & Addenda, Tab F (IBC) sections 105.5 and 114.4, applied to plumbing by Tab I; Planning and Development, Expired Permits pageHow long does a Maricopa County plumbing permit last, and what if you start before you have one?A county permit becomes invalid if work does not start within 180 days of issuance or stops for 180 days. The building official can extend it in writing; the county's Expired Permits page adds one free extension and a half-fee renewal. Starting plumbing work early adds a fee the code states as the permit fee doubled.

Backflow Prevention

Backflow Prevention in every city

City CodeVerified Oct 2026Maricopa County Plan Review Construction Guide, Potable Water Backflow Protection and Water Softeners and Reverse Osmosis (FC 5-203.15, IPC 608.16.4, 608.17.1.2, 609.4)What backflow protection does restaurant equipment need under Maricopa County plan review?It depends on the equipment. The county guide requires a reduced-pressure or other testable continuous-pressure device on carbonators, a testable high-hazard preventer such as an RPZ upstream of any reverse osmosis system, vacuum breakers on submerged inlets, and a device or air gap on all water-supplied equipment. Copper and brass stay out downstream of carbonator and RO.

Drains, Traps and Vents

Drains, Traps and Vents in every city

City CodeVerified Sep 2026Maricopa County Zoning Ordinance Section 1205.7.6 (Drainage Regulations)Maricopa County Zoning 1205: Retention Basins and the 36-Hour RuleIn unincorporated Maricopa County, a commercial site must retain the 100-year, 2-hour storm falling on the whole site and empty it within 36 hours, under Zoning Ordinance Section 1205.7.6. Drywells must be ADEQ-registered, tested one by one, and cleaned by the owner at least every three years.

Fixtures

Fixtures in every city

City CodeVerified Oct 2026Maricopa County Plan Review Construction Guide, Hand Wash Sinks (MCEHC 8.1.8e) and Janitorial Stations, Service (Mop), Can Wash, Utility Sinks (IPC Table 403.1)How many hand sinks and mop sinks does a Maricopa County restaurant need, and where?Enough hand sinks that one is within approximately 25 feet of every workstation, prep and service area, bar, wait station, ice machine and ware washing area, with no door in the way. A splash guard is required within 24 inches of food contact or dish surfaces. A service (mop) sink is also required.

Commercial Plumbing

Commercial Plumbing in every city

Plumbers in Maricopa County Codes and permits in other cities

Also in the library: Uniform Plumbing Code · Arizona · Valley-Wide · Phoenix · Scottsdale · Paradise Valley · Mesa · Chandler · Gilbert · Tempe · Glendale · Surprise · Avondale · Tolleson · Litchfield Park

Need It Done To Maricopa County Code?

Call a licensed plumber who pulls the permit and passes inspection the first time.

(602) 675-1555 Schedule Service