Plumber

Red Seal Plumber exam at a glance

The Red Seal (Interprovincial) Plumber exam contains 125 questions. The official weighting by major work activity is below.

• APerforms common occupational skills11 %
• BPrepares and assembles tube, tubing and pipe10 %
• CInstalls, tests and services sewers, sewage treatment systems and drainage, waste, vents (DWV) systems26 %
• DInstalls, tests and services water service and distribution19 %
• EInstalls, tests and services fixtures, appliances and water treatment systems13 %
• FInstalls, tests and services low-pressure steam and hydronic systems13 %
• GInstalls, tests and services specialized systems8 %

Source: red-seal.ca — Plumber exam weightings (consulted 2026-09-19).

Red Seal Plumber exam FAQ

How many questions are on the Red Seal Plumber exam?

The Red Seal Plumber exam contains 125 questions.

Which area is weighted most heavily on the Plumber exam?

Drainage, waste and vent (DWV) systems (Block C) — 26% of the exam, the largest single block.

How much of the Plumber exam covers water service and distribution?

Water service and distribution (Block D) accounts for 19% of the exam.