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Backflow Prevention: Rules in Phoenix-Area Cities

Backflow assemblies, annual testing, tester rules and cross-connection control programs. City by city, then the Arizona law and model code behind it.

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Backflow Prevention: Rules in Phoenix-Area Cities

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By City

City	What the rule says
Phoenix	Phoenix City Code Ch. 37: Backflow and Cross-Connection Control Phoenix City Code Chapter 37 runs the city's cross-connection control program. Where a property has a backflow hazard, the owner must install an approved backflow assembly, have it tested every year by a certified tester, and file the results with the city. The rules sit in sections 37-141 through 37-146.

Arizona Law

All Arizona law

State Law · Updated Jul 2026Arizona Administrative Code R18-4-215: Backflow Prevention and Annual TestingArizona Administrative Code R18-4-215 requires public water systems to guard the drinking supply from backflow through cross-connections. It makes owners install an approved backflow-prevention assembly where a hazard exists, have it tested by a certified tester, and keep records of each test.

Uniform Plumbing Code

All UPC sections

Model Code · Updated Jul 2026UPC Section 603: Cross-Connection Control and Backflow ProtectionUPC Section 603 requires the drinking-water supply to be protected wherever it could connect to a source of contamination. It bans unprotected cross-connections and calls for a backflow device, such as an air gap or a vacuum breaker, matched to the level of hazard at each point.

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