What is required before connecting an irrigation system to a potable water supply?

Before connecting an irrigation system to a potable water supply, a backflow prevention device is essential. This device is designed to protect the drinking water supply from contamination or pollution that may occur due to the reverse flow of water. In gardens and irrigation systems, various substances like fertilizers, pesticides, and other chemicals could inadvertently enter the water supply if there were to be a change in pressure.

The backflow prevention device ensures that water can only flow in one direction, which keeps potentially harmful substances from flowing back into the potable water supply. This is a critical safety measure mandated by plumbing codes and regulations, emphasizing the importance of safeguarding public health and maintaining the integrity of the water supply system.

While a pressure regulator, filtration system, or automatic timer might have their places in an irrigation setup, they do not specifically protect against backflow, which is the primary concern when connecting to a potable supply.