At what pressure should water lines be air tested?

The recommended pressure for air testing water lines is 100 psi for a duration of 2 hours. This standard is set to ensure the integrity and safety of the plumbing system by identifying any potential leaks or weaknesses in the pipes. Performing the test at this pressure allows for a thorough evaluation of the system’s ability to hold pressure without any loss, which could indicate a breach in the lines.

Testing at a higher pressure, such as 100 psi, provides a more significant safety margin, ensuring that the plumbing can withstand the operational pressures it may encounter once water is introduced and during normal usage. The extended duration of 2 hours also gives ample time for any minute leaks to become apparent, which might not show up in shorter tests. This is crucial for ensuring that the plumbing installation is reliable and minimizes the risk of future leaks or failures.