Master Plumber Practice Exam 2025 - Free Plumber Practice Questions and Study Guide

Testing building sewers is an essential procedure to ensure their integrity and functionality. The correct method involves filling the sewer from the lowest to the highest point. This approach is crucial because it helps to identify any potential leaks or weak points within the entire length of the sewer line. By filling from the lowest to the highest point, you can ensure that the testing effectively replicates the natural flow of liquid through the sewer system, allowing for a thorough assessment of its capacity and structural soundness.

When utilizing this method, plumbers can observe how the system reacts under pressure and evaluate whether it holds water without significant drops in the head pressure, which might indicate leaks or faults. This comprehensive testing method ensures that any issues can be diagnosed effectively before the sewer system is put into use, ultimately preventing future problems related to drainage and waste management.

In contrast, other options would not provide the same level of effective testing. For example, filling the sewer to ground level may not create enough pressure to identify faults, and setting a standard height of 5 feet or 10 feet could be insufficient or excessive depending on the particular configuration and requirements of the sewer system. Thus, filling from the lowest to the highest point is the best practice for thorough and reliable testing.