The backflow preventer keeps irrigation water from flowing back into the drinking water supply.
Repair usually involves replacing worn internal parts or the whole device, followed by testing where required.
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Signs You May Need This Repair
- Water leaking or spraying from the device
- Water discharging from a relief port
- Cracked body
- Low system pressure
Common Causes
- Worn internal parts
- Debris
- Freeze damage
- Pressure changes
Photo: Mds08011, CC BY 4.0How a Technician Handles It
- Inspect the device
- Shut off water
- Replace worn parts or the device
- Test where required
- Restore water and check for leaks
Repair or Replace?
Worn parts are often replaced. Cracked or badly damaged devices are usually replaced.
DIY or Call a Pro?
Because the device protects drinking water and local rules may apply, backflow repair and testing should be done by a qualified professional.
Typical Cost
See our Backflow Repair Cost Guide for typical ranges. Prices vary by location, parts, access and how much diagnosis is needed.
Related Problems
- Why Is My Backflow Preventer Leaking?
- Why Is My Sprinkler System Leaking?
- Why Is My Sprinkler Water Pressure Low?
Related Repairs
Frequently Asked Questions
Why is my backflow preventer leaking?
Worn parts, debris, pressure changes or freeze damage.
Can a backflow preventer be repaired?
Often, by replacing internal parts.
Is backflow testing required?
Requirements vary by area. Check with your local water provider.
Bottom Line
Backflow repair protects both the irrigation system and the drinking water supply. A qualified professional can repair or replace the device and handle any required testing.
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