When pumping at an incident, what should the residual pressure not drop below in psi?

When pumping at an incident, maintaining a proper residual pressure is crucial for ensuring that there is adequate water supply and pressure available for firefighting operations. A residual pressure that does not drop below 10 psi is generally recommended to ensure that there is sufficient pressure in the system to deliver water effectively to the fire scene.

Residual pressure below this threshold could indicate that the water supply is insufficient or that the system is being overstressed, which might lead to an inadequate water supply for hose lines and other firefighting equipment. Maintaining the pressure at or above this level helps to support operational effectiveness and firefighter safety by ensuring that water can be efficiently delivered to where it is needed most during an emergency situation.