Bloom into Success with the 2026 FNGLA Horticulture Landscape Maintenance Test – Cultivate Your Skills!

Backflow prevention focuses on protecting the drinking water supply from contamination that could be drawn back through the irrigation system. If pressure in the main water line drops or a component fails, irrigation water can flow backward into the potable supply. A backflow preventer blocks that reverse flow, creating a barrier so potentially contaminated irrigation water can’t enter taps, wells, or the public water system. This protects health and safety by preventing fertilizers, pesticides, soil, and other contaminants from backward-flowing into drinking water.

This device isn’t about filtering sediment (that’s a filter), nor about increasing pressure (that’s a regulator or pump), nor about stopping irrigation during rain (that’s a rain sensor or controller feature).