What is the maximum allowable water pressure in a residential plumbing system?

The maximum allowable water pressure in a residential plumbing system is typically set to 80 psi. This standard is in place to protect plumbing fixtures and appliances from damage due to excessive pressure, which can lead to leaks or failure of plumbing components. Keeping the water pressure below this threshold helps to ensure that all systems operate efficiently and safely, as high pressure can also place undue stress on pipes, increasing the likelihood of bursts or other failures.

While some codes and local regulations might allow for pressures as high as 90 psi in certain circumstances, 80 psi is the commonly accepted limit that balances performance and safety across most residential systems. Therefore, maintaining water pressure within this limit is crucial for plumbing longevity and the prevention of damage to the plumbing system and fixtures.