What is the minimum working pressure recommended for water mains?

The minimum working pressure of 25 psi (pounds per square inch) for water mains is considered appropriate to ensure adequate system performance and reliability. This pressure level is crucial because it helps to maintain a consistent flow of water while preventing issues such as sediment disturbance and reduced serviceability during peak usage times. A working pressure at or above this threshold helps in the delivery of potable water and supports fire protection services while minimizing the risk of pipe breaks or leaks, which can be exacerbated by lower pressure levels.

Pressures below the minimum recommended amount could lead to various operational challenges, including insufficient water supply during high demand situations or inadequate water pressure for fire hydrants. Therefore, setting the standard at 25 psi ensures a balance between safety, efficiency, and operational requirements within municipal water systems.