What is considered the absolute minimum pressure in a water distribution system?

In a water distribution system, the absolute minimum pressure is crucial for ensuring adequate water flow and preventing issues such as pipe collapse or contamination. A minimum pressure of 20 psi is generally recognized as the threshold that allows for proper operation of faucets, appliances, and fire hydrants. This pressure ensures that water can successfully reach consumer taps and maintain a steady flow, which is essential for maintaining public health and safety.

While pressures lower than this can lead to insufficient flow rates and increased risks of backflow contamination, pressures above 20 psi are typically more desirable for effective distribution and user satisfaction. Therefore, setting 20 psi as the minimum pressure helps to balance the needs of the water system with operational safety and efficiency.