What it means
A backflow preventer allows water to flow in one direction only. If downstream pressure exceeds supply pressure, the device closes to keep irrigation water, boiler fluid, or other non-potable sources out of your taps.
Residential and commercial properties with irrigation systems, fire sprinklers, or boiler loops often require tested backflow assemblies under county and water district rules.
Why it matters in Santa Cruz County
Santa Cruz County water districts require annual backflow testing for many commercial kitchens, irrigation meters, and multi-unit properties from Santa Cruz to Live Oak. Coastal fog and hillside irrigation zones increase the number of protected connections on older duplexes and vacation rentals.
Homeowner tip
Never bypass or remove a backflow device to fix low pressure; call a certified tester instead.
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Also explore the Septic Glossary or call 831.225.4344 with questions about your property.