What is the role of a backflow preventer in an irrigation system?

• A. Protect potable water supply
• B. Regulate irrigation scheduling
• C. Increase water pressure
• D. Filter sediments

Answer: (A)

Backflow preventers protect the drinking water supply by stopping irrigation water from flowing backward into the public water system. In an irrigation setup, pressure changes or downstream demands can pull water from the main line back through the irrigation pipes. If that water carries fertilizers, pesticides, or other contaminants, it could contaminate the potable supply. The backflow device sits at the connection to the water supply and blocks reverse flow, preventing cross-connections. It isn’t meant to regulate when you water, increase pressure, or filter sediments, so those functions aren’t the role of this device.