100+ Free AL Plumber Practice Questions

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Under the IPC as adopted in Alabama, what is the minimum size drain pipe required for a water closet (toilet)?

2 inches

3 inches

4 inches

1-1/2 inches

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Free Journeyman Plumber Practice Test by State 2026: 4,700+ Questions24 min read

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Key Facts: AL Plumber Exam

70%

Passing Score

AL Plumbers & Gas Fitters Board

Questions

~2hr 54min time limit

$35-175

Exam Fee

Prov

IPC

Code Basis

International Plumbing Code

Alabama's journeyman plumber exam has approximately a 60% pass rate. The 75-question exam requires 70% to pass and is based on the IPC. Alabama requires completion of an apprenticeship or equivalent experience. The exam covers plumbing code, DWV systems, water supply, gas piping, and fixtures.

Sample AL Plumber Practice Questions

Try these sample questions to test your AL 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 IPC as adopted in Alabama, what is the minimum size drain pipe required for a water closet (toilet)?

A.2 inches

B.3 inches

C.4 inches

D.1-1/2 inches

Explanation: Per IPC Table 709.1, the minimum drain size for a water closet is 3 inches. This applies to both floor-outlet and wall-hung water closets. The 3-inch minimum ensures adequate flow capacity to handle the fixture's discharge rate and solid waste.

2According to the IPC as enforced by the Alabama Plumbers & Gas Fitters Examining Board, 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 IPC Section 704.1, horizontal drainage pipes 3 inches and larger must have a minimum slope of 1/8 inch per foot. Pipes smaller than 3 inches require a steeper slope of 1/4 inch per foot. The slope ensures proper gravity flow and self-scouring velocity.

3Under Alabama's plumbing code, what is the DFU (Drainage Fixture Unit) value for a residential lavatory?

A.1 DFU

B.2 DFU

C.3 DFU

D.0.5 DFU

Explanation: Per IPC Table 709.1, a residential lavatory is assigned 1 DFU. This value represents the probable discharge rate and is used to size drainage piping and venting systems. Commercial lavatories may have different DFU values depending on their size and configuration.

4Per the IPC as adopted in Alabama, what is the maximum distance a P-trap can be located from the fixture outlet?

A.12 inches

B.18 inches

C.24 inches

D.30 inches

Explanation: Per IPC Section 1002.1, the trap shall be installed as close to the fixture outlet as possible, but not more than 24 inches from the fixture outlet. This ensures the trap seal is maintained and reduces the possibility of fouling in the tailpiece between the fixture and the trap.

5Under the IPC as enforced in Alabama, what is the minimum vent pipe size for a single water closet?

A.1-1/4 inches

B.1-1/2 inches

C.2 inches

D.3 inches

Explanation: Per IPC Table 906.1, the minimum vent size for a water closet with a 3-inch drain is 1-1/2 inches. The vent must be at least one-half the size of the drain it serves, but never less than 1-1/4 inches. For a 3-inch drain, half is 1-1/2 inches.

6According to the IPC as adopted in Alabama, what type of backflow preventer is required to protect a potable water system from a high-hazard cross-connection?

A.Dual check valve

B.Atmospheric vacuum breaker

C.Reduced pressure zone (RPZ) assembly

D.Hose bibb vacuum breaker

Explanation: Per IPC Section 608.16, a reduced pressure zone (RPZ) backflow prevention assembly is required for high-hazard cross-connections. The RPZ provides the highest level of protection because it includes two independent check valves and a relief valve that opens to atmosphere if both checks fail.

7Under Alabama's adoption of the IPC, what is the maximum water temperature setting for a residential water heater at the point of use?

A.100°F

B.110°F

C.120°F

D.140°F

Explanation: Per IPC Section 607.1, the maximum hot water temperature at fixtures used for bathing and showering shall be limited to 120°F by means of a tempering device. This protects building occupants from scalding injuries. Water heaters may store water at higher temperatures for sanitation purposes, but point-of-use temperature must be limited.

8Per the IPC as adopted in Alabama, what is the minimum size water supply pipe to a standard residential kitchen sink?

A.3/8 inch

B.1/2 inch

C.3/4 inch

D.1 inch

Explanation: Per IPC Table 604.5, the minimum water supply pipe size for a kitchen sink is 1/2 inch. This applies to both hot and cold supply lines. The 1/2-inch minimum ensures adequate flow rate for the fixture under normal supply conditions.

9Under the IPC as enforced in Alabama, what is the minimum air gap required for an indirect waste connection from a commercial dishwasher?

A.1 inch or one pipe diameter, whichever is greater

B.2 inches or two pipe diameters, whichever is greater

C.1 inch

D.The air gap must equal twice the effective opening of the drain

Explanation: Per IPC Section 801.2, an air gap is defined as the unobstructed vertical distance through free atmosphere between the lowest opening of any pipe or faucet supplying water to a tank or plumbing fixture and the flood-level rim. The minimum air gap must be at least twice the effective opening of the drain but not less than 1 inch.

10According to the Alabama plumbing code (IPC), what is the minimum number of water closets required in a restaurant with an occupant load of 75?

A.1 male / 1 female

B.2 male / 2 female

C.3 male / 3 female

D.2 male / 3 female

Explanation: Per IPC Table 403.1, restaurants with an occupant load of 1-50 require 1 water closet per sex, and 51-100 occupants require 2 per sex. With 75 occupants, the minimum is 2 male and 2 female water closets. Additional fixtures are required as occupant load increases.

About the AL Plumber Exam

The Alabama journeyman plumber exam is administered by Prov on behalf of the Plumbers & Gas Fitters Examining Board. It tests knowledge of the IPC, drainage systems, water supply, venting, gas piping, and Alabama-specific amendments across 75 multiple-choice questions.

Questions

75 scored questions

Time Limit

2 hours 54 minutes

Passing Score

70%

Exam Fee

$35-$175 (Alabama Plumbers & Gas Fitters Examining Board)

AL Plumber Exam Content Outline

25%

Drainage, Waste & Vent Systems

IPC drain sizing, fixture units, slope requirements, cleanouts, trap seals, and DWV installation per Alabama 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, and common venting per the IPC

15%

Gas Piping & Appliances

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

15%

Code Administration & Materials

Permits, inspections, approved materials, joint methods, pipe supports, fixtures, and Alabama state-specific rules

How to Pass the AL Plumber Exam

What You Need to Know

Passing score: 70%
Exam length: 75 questions
Time limit: 2 hours 54 minutes
Exam fee: $35-$175

Keys to Passing

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

AL Plumber Study Tips from Top Performers

1Master IPC drain sizing tables and fixture unit calculations — these are heavily tested on the Alabama exam

2Study backflow prevention device selection for different hazard levels per IPC Section 608

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

4Practice gas pipe sizing using IFGC 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 Alabama use?

Alabama uses the International Plumbing Code (IPC) with state-specific amendments. The exam is based on the current adopted edition. The Alabama Plumbers & Gas Fitters Examining Board oversees all licensing requirements.

How many questions are on the Alabama plumber exam?

The Alabama journeyman plumber exam has approximately 75 multiple-choice questions with a time limit of about 2 hours and 54 minutes. A score of 70% is required to pass.

Who administers the Alabama plumber exam?

The exam is administered by Prov on behalf of the Alabama Plumbers & Gas Fitters Examining Board. You must apply through the Board and schedule your exam through Prov's testing system.

What experience is required to take the Alabama journeyman plumber exam?

Alabama requires completion of a plumbing apprenticeship or equivalent documented experience working under a licensed plumber. Contact the Plumbers & Gas Fitters Examining Board for specific hour requirements.