What is the minimum normal operating pressure stated for water distribution systems?

The minimum normal operating pressure for water distribution systems is 35 psi. This standard ensures that the system can provide adequate pressure for residential and commercial use, including sufficient flow for firefighting, domestic needs, and other essential services. Maintaining a minimum pressure helps prevent water stagnation in the pipes and reduces the likelihood of contamination and other issues that can arise from inadequate pressure.

A pressure lower than this could lead to insufficient water delivery during peak usage times or emergencies. This value has been established to support reliable water service while ensuring that infrastructure is protected from damage due to pressure fluctuations.