According to regulations for public water systems, what is the minimum pressure that must not be less than in water distribution systems?

The minimum pressure requirement for water distribution systems is crucial to ensure that water can be delivered effectively throughout the system and to consumers. The standard of 20 psi is set to maintain sufficient pressure within the distribution lines. This level is important for several reasons:

First, adequate pressure ensures that water can reach all consumers, even those located at higher elevations. If the pressure drops below this threshold, it could lead to inadequate supply in elevated areas and potentially impact fire protection services.

Second, maintaining a minimum pressure level helps prevent backflow contamination. If the pressure is too low, it can create conditions that allow for contaminants to enter the potable water supply, posing health risks to consumers.

Finally, a minimum pressure of 20 psi is generally considered sufficient for the operation of most household plumbing fixtures. This level helps to ensure proper functionality and water accessibility for everyday needs.

In summary, the correct answer reflects the established standards for public water systems to maintain operational integrity, health safety, and consumer satisfaction.