How many questions are on the 447A Red Seal Plumber exam?

The 447A Red Seal Plumber exam consists of 120 multiple-choice questions. A minimum score of 70% is required to pass.

What topics are covered on the 447A Red Seal exam?

The 447A exam covers: Drainage/Waste/Vent systems (~30%), Water Supply (~25%), Gas Piping (~15%), Fixtures/Appliances (~15%), Plumbing Code/Safety (~15%).

What plumbing code is used in Canada?

The National Plumbing Code of Canada (NPC) is the model code adopted (with amendments) by most provinces. Some provinces (Ontario, BC) use provincial codes based on NPC.

What is the minimum trap seal depth for a plumbing fixture?

Per the National Plumbing Code of Canada, the minimum trap seal depth is 50 mm (2 inches) and the maximum is 100 mm (4 inches).

447A Red Seal — Plumber

Canada Certification Exam Practice Questions | 2026

Based on 2023 Red Seal Occupational Standard (RSOS) ✓ Updated Apr 2026 NPC / 2023 RSOS Aligned

About the 447A Red Seal Plumber Exam

The Red Seal Plumber (447A) exam is Canada's nationally recognized certification for professional plumbers. The exam consists of 120 multiple-choice questions based on the 2023 Red Seal Occupational Standard (RSOS) and aligned with the National Plumbing Code of Canada (NPC). Topics include drainage/waste/vent systems, water supply, gas piping, fixtures, and plumbing code. A passing score of 70% is required. Practice with these 110 free questions — no signup needed.

Exam Structure — Topic Breakdown

Block	Topic	Approx. Questions
A	Common Occupational Skills (Safety, Tools, Blueprints)	18
B	Drainage, Waste & Vent (DWV) Systems	30
C	Water Supply Systems	24
D	Gas Piping Systems	18
E	Fixtures, Appliances & Equipment	18
F	Plumbing Code & Inspections	12

* Approximate distribution. Passing score: 70%. Code: National Plumbing Code of Canada (NPC).

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About the 447A Red Seal Plumber Exam

Exam Structure — Topic Breakdown

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