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Exam Review

Key Facts: AL Plumber Exam

70%

Passing Score

AL Plumbers & Gas Fitters Board

75

Questions

175-minute time limit

$110

Exam Fee

AL Plumbers & Gas Fitters Board

IPC

Code Basis

International Plumbing Code

Alabama's journeyman plumber exam has 75 open-book questions in 175 minutes and requires 70% to pass. Candidates are tested on the 2021 International Plumbing Code and 2021 International Fuel Gas Code. Applicants need two years of current work experience as an apprentice or a Board-approved apprentice training program, and pay a $110 exam fee to the Board.

Sample AL Plumber Practice Questions

Try these sample questions to review concepts for the AL Plumber exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 380+ 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. Its 75 open-book multiple-choice questions cover general knowledge, plan reading, trade math, tools, sizing and design, fixtures, drain, waste and vent piping, roof drains, installation, water heaters, safety, and Alabama plumbing and gas law, based on the 2021 IPC and 2021 IFGC.

Exam sponsor: Alabama Plumbers & Gas Fitters Examining Board. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

75 questions

Time Limit

175 minutes

Passing Score

70%

Exam / Certification Fees

$110 (paid to the Board)

Exam sponsor website

Reported exam pass rate: Not published. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

13%

General Knowledge

10 of 75 questions on the Prov exam

7%

Drawings and Plan Reading

5 of 75 questions on the Prov exam

8%

Trade Math

6 of 75 questions on the Prov exam

7%

Tools

5 of 75 questions on the Prov exam

12%

Sizing and Design

9 of 75 questions on the Prov exam

8%

Fixtures and Fittings

6 of 75 questions on the Prov exam

8%

Drain Waste and Vents

6 of 75 questions on the Prov exam

7%

Roof Drain Systems

5 of 75 questions on the Prov exam

9%

System Installation

7 of 75 questions on the Prov exam

8%

Water Heaters

6 of 75 questions on the Prov exam

7%

Safety

5 of 75 questions on the Prov exam

7%

Alabama Plumbing and Gas Law

5 of 75 questions on the Prov exam

Preparing for the AL Plumber Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 75 questions
  • Time limit: 175 minutes
  • Exam / certification fees: $110 (paid to the Board) Official sources

Using Our Practice Resources

  • Work through all 380 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

AL Plumber: Suggested Study Strategy

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?

Since January 1, 2023, Alabama exam candidates have been tested on the 2021 International Plumbing Code or the 2021 International Fuel Gas Code. The Board's minimum standards also apply the 2021 IPC to commercial plumbing work. The Alabama Plumbers & Gas Fitters Examining Board oversees all certification.

How many questions are on the Alabama plumber exam?

The Alabama journeyman plumber exam has 75 multiple-choice questions with a 175-minute time limit. A score of 70% is required to pass, and the exam is open book.

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 verifiable proof of two years of current work experience as an apprentice plumber, or completion of a Board-approved apprentice training program, before the journeyman exam.