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Under the UPC/IPC as adopted in Arizona, what is the minimum size drain pipe required for a water closet?

2 inches

3 inches

4 inches

1-1/2 inches

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Key Facts: AZ Plumber Exam

70%

Passing Score

Arizona Registrar of Contractors

Questions

3 hours time limit

$100-$580

Exam Fee

PSI

UPC/IPC

Code Basis

Arizona uses a mix of UPC and IPC provisions with state-specific amendments

Arizona's journeyman plumber exam has approximately a 58% pass rate. The 80-question exam requires 70% to pass and is based on the UPC/IPC. Arizona uses a mix of UPC and IPC provisions with state-specific amendments.

Sample AZ Plumber Practice Questions

Try these sample questions to test your AZ Plumber exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the UPC/IPC as adopted in Arizona, what is the minimum size drain pipe required for a water closet?

A.2 inches

B.3 inches

C.4 inches

D.1-1/2 inches

Explanation: Per UPC/IPC drainage pipe sizing tables, the minimum drain size for a water closet is 3 inches. This applies to all types of water closets and ensures adequate capacity to convey solid waste through the drainage system.

2According to the UPC/IPC as enforced in Arizona, what is the minimum slope for a 4-inch horizontal drainage pipe?

A.1/16 inch per foot

B.1/8 inch per foot

C.1/4 inch per foot

D.1/2 inch per foot

Explanation: Per UPC/IPC slope requirements, horizontal drainage pipes 3 inches and larger must have a minimum slope of 1/8 inch per foot. Pipes smaller than 3 inches require 1/4 inch per foot. Proper slope ensures self-scouring velocity.

3Under Arizona's plumbing code, what is the DFU value for a residential lavatory?

A.1 DFU

B.2 DFU

C.3 DFU

D.0.5 DFU

Explanation: Per UPC/IPC fixture unit tables, a residential lavatory is assigned 1 DFU. This value represents the probable discharge rate and is used to size drainage and venting systems.

4Per the UPC/IPC as adopted in Arizona, what is the minimum depth of a fixture trap seal?

A.1 inch

B.2 inches

C.3 inches

D.4 inches

Explanation: Per UPC/IPC trap requirements, each fixture trap must have a water seal of not less than 2 inches and not more than 4 inches. The 2-inch minimum prevents sewer gases from passing through under normal conditions.

5According to the UPC/IPC as enforced in Arizona, at what intervals must cleanouts be installed on horizontal drainage piping 4 inches and smaller?

A.Every 50 feet

B.Every 75 feet

C.Every 100 feet

D.Every 150 feet

Explanation: Per UPC/IPC cleanout requirements, cleanouts must be installed at intervals not exceeding 100 feet for pipes 4 inches and smaller. Additional cleanouts are required at each change of direction greater than 45 degrees.

6Under the UPC/IPC as adopted in Arizona, what is the maximum number of DFUs that can be connected to a 3-inch horizontal branch?

A.12 DFU

B.20 DFU

C.36 DFU

D.42 DFU

Explanation: Per UPC/IPC drain sizing tables, a 3-inch horizontal branch can serve a maximum of approximately 20 DFU. Exceeding this limit risks drainage backup and surcharging.

7Per the UPC/IPC as enforced in Arizona, what is the required slope for a 2-inch horizontal drainage pipe?

A.1/16 inch per foot

B.1/8 inch per foot

C.1/4 inch per foot

D.1/2 inch per foot

Explanation: Per UPC/IPC slope requirements, pipes smaller than 3 inches require a minimum slope of 1/4 inch per foot. The steeper slope is necessary for smaller pipes to maintain self-scouring velocity.

8According to the UPC/IPC as adopted in Arizona, what is the minimum size building sewer when serving more than one water closet?

A.3 inches

B.4 inches

C.6 inches

D.2 inches

Explanation: Per UPC/IPC building sewer requirements, a building sewer serving more than one water closet must be at least 4 inches. A single water closet may use a 3-inch sewer in some configurations.

9Under the UPC/IPC as enforced in Arizona, what is the maximum tailpiece length from a fixture outlet to the trap weir?

A.12 inches

B.18 inches

C.24 inches

D.36 inches

Explanation: Per UPC/IPC trap requirements, the vertical distance from the fixture outlet to the trap weir must not exceed 24 inches. Longer tailpieces risk siphonage and waste buildup.

10Per the UPC/IPC as adopted in Arizona, what is the DFU value for a residential bathtub with shower?

A.1 DFU

B.2 DFU

C.3 DFU

D.4 DFU

Explanation: Per UPC/IPC fixture unit tables, a residential bathtub with or without a shower is assigned 2 DFU. The shower head does not add fixture units since it shares the same drain and trap.

About the AZ Plumber Exam

The Arizona journeyman plumber exam is administered by PSI on behalf of the Arizona Registrar of Contractors. The Arizona exam includes both a trade exam and a business management exam for contractor licensing. It tests knowledge of the UPC/IPC, drainage systems, water supply, venting, gas piping, and Arizona-specific amendments.

Questions

80 scored questions

Time Limit

3 hours

Passing Score

70%

Exam Fee

$100-$580 (Arizona Registrar of Contractors)

AZ Plumber Exam Content Outline

25%

Drainage, Waste & Vent Systems

UPC/IPC drain sizing, fixture units, slope requirements, cleanouts, trap seals, and DWV installation per Arizona amendments

25%

Water Supply & Distribution

Pipe sizing, backflow prevention, cross-connection control, water heaters, pressure regulation, and T&P relief requirements

20%

Venting Systems

Vent sizing, wet venting, circuit venting, air admittance valves, vent termination per the UPC/IPC

15%

Gas Piping & Appliances

Gas pipe sizing, BTU calculations, pressure testing, appliance venting, and combustion air requirements

15%

Code Administration & Materials

Permits, inspections, approved materials, joint methods, pipe supports, and Arizona-specific rules

How to Pass the AZ Plumber Exam

What You Need to Know

Passing score: 70%
Exam length: 80 questions
Time limit: 3 hours
Exam fee: $100-$580

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

AZ Plumber Study Tips from Top Performers

1Master UPC/IPC drain sizing tables and fixture unit calculations — heavily tested on the Arizona exam

2Study backflow prevention device selection for different hazard levels per UPC/IPC cross-connection requirements

3Memorize minimum pipe sizes, trap sizes, and vent sizes for common residential fixtures

4Practice gas pipe sizing using fuel gas code tables including BTU demand calculations

5Review water heater installation requirements including T&P relief, expansion tanks, and pan requirements

Frequently Asked Questions

What plumbing code does Arizona use?

Arizona uses a mix of UPC and IPC provisions with state-specific amendments. The Arizona Registrar of Contractors oversees all licensing requirements. The exam is based on the current adopted UPC/IPC edition.

How many questions are on the Arizona plumber exam?

The Arizona journeyman plumber exam has approximately 80 multiple-choice questions with a time limit of 3 hours. A score of 70% is required to pass.

Who administers the Arizona plumber exam?

The exam is administered by PSI on behalf of the Arizona Registrar of Contractors. You must apply through the agency and schedule your exam through PSI's testing system.

What experience is required for the Arizona journeyman plumber exam?

Minimum 4 years of journeyman-level plumbing experience or equivalent apprenticeship. Contact the Arizona Registrar of Contractors for specific requirements and application procedures.