What type of backflow prevention device is generally required for irrigation systems?

Irrigation systems are particularly susceptible to contamination due to their connection to potable water supplies and the potential for water to be siphoned back into the drinking water system. To prevent this backflow, specific devices are mandated by regulations to ensure safe connections between irrigation systems and potable water.

A Pressure Vacuum Breaker (PVB) is specifically designed to protect against back siphonage, which occurs when there is a sudden drop in water pressure, potentially pulling contaminated water back into the clean water supply. An Reduced Pressure Zone (RPZ) device, on the other hand, offers dual protection against both back pressure and back siphonage due to its design that includes two independent check valves and a vent to the atmosphere. Both of these types are commonly accepted as crucial components in preventing backflow in irrigation systems, as they adhere to the highest safety standards.

Therefore, the inclusion of either a PVB or an RPZ in irrigation systems aligns with regulatory requirements aimed at protecting public health and the integrity of water supplies.