What pressure must not be dropped below in a water distribution system?

In a water distribution system, maintaining adequate pressure is crucial for ensuring that water is delivered effectively and to meet the demand of consumers and fire protection services. The minimum pressure guideline often referenced is around 20 psi.

This minimum threshold is important for several reasons. First, at pressures below 20 psi, the system may struggle to adequately supply water to the highest floors of buildings. This can lead to insufficient water flow in taps and fixtures, which can impact public health and safety. Second, maintaining a pressure of at least 20 psi helps to prevent issues such as back-siphonage, which can lead to contamination of the potable water supply.

Therefore, a pressure of 20 psi is considered a critical minimum standard that should not be dropped below in the context of typical residential and commercial water distribution systems. In certain circumstances, local regulations or specific system requirements may vary, but 20 psi serves as a widely recognized safeguard for maintaining both functionality and safety in water distribution systems.