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Question 1

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Per IPC 2021 as adopted by Louisiana, what is the minimum slope for a 3-inch horizontal drain?

1/16 inch per foot

1/8 inch per foot

1/4 inch per foot

1/2 inch per foot

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

2026 Statistics

Key Facts: LA Plumber Exam

70%

Passing Score

Louisiana SPBLA

~100

Exam Questions

SPBLA exam format

Paper

Exam Format

Scantron/paper

IPC 2021

Code Base

Louisiana adoption

The Louisiana journeyman plumber exam is administered by the State Plumbing Board (SPBLA) as an open-book paper/scantron exam — not computer-based. The exam is based on the IPC 2021 and IRC, requiring 70% to pass. Candidates should bring clean, bound copies of both the IPC 2021 and IRC. The paper format means no going back easily, so read each question carefully.

Sample LA Plumber Practice Questions

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

1Per IPC 2021 as adopted by Louisiana, what is the minimum slope for a 3-inch horizontal drain?

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 2021 Section 704.1, horizontal drainage pipes 3 inches or smaller require a minimum slope of 1/4 inch per foot. Pipes 4 inches and larger require 1/8 inch per foot.

2Per IPC 2021, a lavatory has a DFU value of what?

A.0.5 DFU

B.1 DFU

C.1.5 DFU

D.2 DFU

Explanation: Per IPC 2021 Table 709.1, a lavatory has a drainage fixture unit (DFU) value of 1. This value is used for sizing both the individual fixture drain and the branch/building drains.

3Per IPC 2021, what is the maximum number of DFUs on a 4-inch building drain at 1/4 inch per foot slope?

A.160 DFU

B.180 DFU

C.216 DFU

D.250 DFU

Explanation: Per IPC 2021 Table 710.1(1), a 4-inch building drain at 1/4 inch per foot slope can handle a maximum of 216 DFUs. This is the standard sizing table used for building drain design.

4Per IPC 2021, the minimum building sewer pipe size is what?

A.3 inches

B.4 inches

C.5 inches

D.6 inches

Explanation: Per IPC 2021, the minimum building sewer size is 6 inches when connecting to the public sewer. This ensures adequate capacity for the building's total drainage load and future connections.

5Per IPC 2021, cleanouts must be installed at intervals not exceeding what distance?

A.50 feet

B.75 feet

C.100 feet

D.125 feet

Explanation: Per IPC 2021 Section 708.3.5, cleanouts must be installed at intervals not exceeding 100 feet in horizontal drainage lines. For pipes 4 inches and smaller, the interval may be reduced.

6Per IPC 2021, a floor-mounted water closet has what DFU value?

A.2 DFU

B.3 DFU

C.4 DFU

D.6 DFU

Explanation: Per IPC 2021 Table 709.1, a floor-mounted water closet (1.6 GPF) has a DFU value of 4. This is one of the highest individual fixture DFU values.

7Per IPC 2021, indirect waste piping from a commercial ice maker must discharge through what?

A.Direct connection to the building drain

B.An air gap to an approved receptor

C.A check valve

D.A backwater valve

Explanation: Per IPC 2021 Chapter 8, indirect waste from commercial ice machines must discharge through an air gap into an approved floor sink or receptor. This prevents contamination from potential backflow into the ice maker.

8Per IPC 2021, what fitting is required for a horizontal-to-horizontal change of direction in the drainage system?

A.Short-sweep 1/4 bend

B.Long-sweep 1/4 bend or combination of fittings

C.Standard tee

D.Any fitting is acceptable

Explanation: Per IPC 2021, horizontal-to-horizontal changes of direction must use long-sweep fittings (long-sweep 1/4 bends) or a combination of fittings equivalent to a long sweep. Short-sweep fittings are not permitted for horizontal direction changes.

9Per IPC 2021, the maximum number of DFUs on a 3-inch horizontal branch is what at 1/4 inch per foot?

A.20 DFU

B.36 DFU

C.42 DFU

D.60 DFU

Explanation: Per IPC 2021 Table 710.1(2), a 3-inch horizontal branch drain at 1/4 inch per foot slope can handle a maximum of 36 DFUs.

10Per IPC 2021, what is the minimum size individual fixture drain for a bathtub?

A.1-1/4 inches

B.1-1/2 inches

C.2 inches

D.3 inches

Explanation: Per IPC 2021 Table 709.1, the minimum individual fixture drain size for a bathtub (with or without shower) is 1-1/2 inches.

About the LA Plumber Exam

Louisiana journeyman plumber licensing exam administered directly by the State Plumbing Board (SPBLA). This is a state-administered open-book paper/scantron exam based on the IPC 2021 and IRC. Covers drainage systems, water supply, venting, fixtures and appliances, gas piping, materials, and plumbing code administration. Louisiana is unique in using a paper-based scantron format rather than computer-based testing.

Questions

100 scored questions

Time Limit

4 hours

Passing Score

70%

Exam Fee

$135 (Louisiana State Plumbing Board (SPBLA))

LA Plumber Exam Content Outline

25%

Drainage Systems

Drain pipe sizing, DFU calculations, slope requirements, cleanouts, building sewers, indirect waste, and special drainage systems per IPC 2021

20%

Water Supply Systems

Water pipe sizing, WSFU calculations, backflow prevention, pressure regulation, water heaters, cross-connection control, and IRC residential requirements

20%

Venting Systems

Vent sizing, wet venting, circuit venting, air admittance valves, vent termination, island fixture venting, and trap seal protection per IPC

15%

Fixtures & Appliances

Fixture installation, clearances, accessible fixtures, commercial fixtures, water closets, lavatories, showers, and bathtubs per IPC/IRC

10%

Gas Piping

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

10%

Code Administration & Materials

Permits, inspections, plan review, approved materials, pipe materials, joint methods, hangers and supports, and Louisiana-specific regulations

How to Pass the LA Plumber Exam

What You Need to Know

Passing score: 70%
Exam length: 100 questions
Time limit: 4 hours
Exam fee: $135

Keys to Passing

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

LA Plumber Study Tips from Top Performers

1Master IPC 2021 code navigation — the open-book paper format means you cannot easily go back, so know where to find answers quickly

2Study both the IPC 2021 and IRC since Louisiana tests on both codes

3Practice DFU calculations and drain pipe sizing using IPC Table 710.1(2)

4Master vent sizing tables and understand wet venting requirements per IPC Chapter 9

5Review backflow prevention requirements and know which devices protect against which hazards

6Study water heater installation including T&P relief valve requirements

7Practice gas pipe sizing calculations using longest-length method

8Tab your code books thoroughly with clean tabs — this saves critical time on the paper exam

Frequently Asked Questions

How hard is the Louisiana journeyman plumber exam?

The Louisiana journeyman plumber exam is challenging with an estimated 50-60% pass rate. It uses a paper/scantron format (not computer-based) and is open-book with the IPC 2021 and IRC. Strong code navigation skills are essential since the paper format does not allow easy review of previous answers.

What plumbing code does Louisiana use?

Louisiana uses the International Plumbing Code (IPC) 2021 edition and the International Residential Code (IRC) for its journeyman plumber exam. Candidates should bring clean, bound copies of both codes to the exam. No highlighting, tabs with writing, or loose notes are permitted.

How much does the Louisiana plumber exam cost?

The Louisiana journeyman plumber exam fee is $135 paid to the State Plumbing Board (SPBLA). Additional costs include application fees and code books (IPC 2021 and IRC). Check with the SPBLA for the current fee schedule.

Is the Louisiana plumber exam paper or computer-based?

Louisiana administers the journeyman plumber exam in a paper/scantron format, not computer-based. This is unusual among states, most of which use PSI or Prometric computer-based testing. The exam is administered directly by the State Plumbing Board (SPBLA) at scheduled testing dates.