Massachusetts Plumbers Journeyman Practice Exam 2026 – All-in-One Guide to Master Your Licensing Test!

Question: 1 / 400

What is the minimum size requirement for piping used for sub-soil drains?

A. 2"

B. 3"

C. 4"

The correct answer is that the minimum size requirement for piping used for sub-soil drains is 4 inches. This requirement is in place to ensure adequate flow capacity for draining subsurface water. When dealing with sub-soil drains, it's crucial to allow for sufficient drainage to prevent water accumulation in soil, which can lead to various issues such as structural damage or mold growth.

A 4-inch diameter pipe provides a balance between being large enough to handle expected water flow while remaining manageable for installation and maintenance. Smaller diameter pipes may not effectively carry the volume of water that can accumulate from rain or surface water runoff, leading to potential blockages and inefficient drainage.

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D. 5"

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