At what pressure should a water distribution system be tested?

A water distribution system is typically tested at a pressure that ensures the integrity and safety of the piping under working conditions. Testing at 100 psi for a duration of 2 hours is a standard practice that provides a sufficient margin to identify any potential leaks or weaknesses in the system. This pressure level is designed to exceed normal operating pressures in most plumbing applications, allowing for a thorough examination of the system’s ability to hold pressure without failure.

During this testing phase, maintaining the pressure for a prolonged period, such as two hours, allows for the detection of slow leaks that may not be immediately visible and ensures that any installed fittings, joints, and connections can withstand the pressure without yielding. It provides a robust assessment of the system's integrity.

Other pressures and durations listed may not be sufficient to guarantee the same level of assurance. They generally do not align with industry standards for comprehensive system testing, which often requires higher pressures and longer durations to thoroughly assess the entire system's resilience. This is why 100 psi for 2 hours is the appropriate choice for a pressure test of a water distribution system.