Why Is My Sprinkler Backflow Preventer Leaking?

Short answer: water from an irrigation backflow assembly can come from freeze damage, worn internal components, debris, improper valve position, damaged fittings or a failure elsewhere in the assembly. Where and when it leaks matters.

Where is the water coming from?

Water at a threaded fitting suggests a different problem from water discharging through the device itself. Before replacing parts, identify the exact source and whether the leak occurs continuously, only when irrigation runs, or only while the system is being turned on.

Freeze damage is important in Michigan

Water trapped in exposed irrigation components can freeze and expand. Cracked bodies, damaged internal parts and split fittings may not become obvious until spring startup or the next time the water is turned on.

Do not confuse irrigation repair with testing requirements

Repairing a leaking irrigation component and performing a required certified backflow test are different services. Requirements can depend on the water authority and installation.

When to shut the irrigation water off

If the assembly is leaking heavily or a fitting is visibly damaged, shutting off the irrigation supply can limit water loss until the problem is diagnosed, provided you know the correct irrigation shutoff and can operate it safely.

Backflow-related irrigation repair in Grosse Pointe

Grosse Pointe Irrigation diagnoses and repairs irrigation-side problems on existing residential systems. Call/text (313) 992-9900 for service.

Michigan sprinkler winterization · Irrigation Resource Center.