What is a key requirement for an RPZ backflow prevention system?

The key requirement for a Reduced Pressure Zone (RPZ) backflow prevention system is that it must be installed a minimum of 12 inches above grade. This height is crucial for several reasons. First, positioning the RPZ at this elevation helps to ensure that any potential backflow is contained and does not contaminate the potable water supply. Additionally, being elevated helps prevent debris and water accumulation around the device, which could affect its operation.

This standard also takes into account maintenance and inspection needs. A height of 12 inches above grade makes it accessible while still following industry regulations. Proper installation heights help ensure the RPZ operates effectively and complies with local plumbing codes and standards.