What is the minimum PSI required in a distribution system according to DEP?

The minimum pressure required in a distribution system is essential for ensuring that water can effectively reach consumers safely and reliably. The correct standard is 20 psi, as this level is considered sufficient to meet both operational requirements and to ensure that water is delivered effectively throughout the system, even at the highest points of the distribution system.

Maintaining a minimum of 20 psi helps to prevent the backflow of contaminants and protects the integrity of the water supply. This minimum pressure also ensures that firefighting efforts can be adequately supported, as low pressure can impair the ability of firefighters to use hydrants or draw water from the system during emergencies.

Lower pressures, such as 10 psi or 15 psi, do not provide an adequate safety margin for these critical functions and could lead to service disruptions or backflow incidents. Thus, the established minimum of 20 psi is a crucial parameter set by regulatory bodies to ensure public health and safety in drinking water distribution systems.