Massachusetts Plumbers Journeyman Practice Exam

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What is the minimum height requirement for a standpipe connected to a clothes washer?

  1. 20 inches

  2. 25 inches

  3. 30 inches

  4. 35 inches

The correct answer is: 30 inches

The minimum height requirement for a standpipe connected to a clothes washer is 30 inches. This measurement is critical to ensure proper drainage. A standpipe that is set at 30 inches helps to prevent siphoning action that could occur if water were to drain too quickly or if there was a backflow situation. This height allows for adequate space for the washing machine's discharge hose, ensuring that the wastewater is directed safely into the plumbing system. In addition, this height requirement is consistent with plumbing codes that aim to protect the plumbing system from potential issues related to drainage and to ensure efficient operation of the appliance.

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