Commercial Fire Protection Service
Backflow Prevention for Fire Sprinkler Systems
Fire sprinkler systems connect to a building’s drinking water supply, which is why most jurisdictions require a tested backflow prevention assembly. Get matched with a contractor for testing or installation.
Overview
Because fire sprinkler systems tie directly into a building’s potable water supply, there is a real risk of stagnant, non-potable water from the sprinkler piping siphoning backward into the drinking water system under certain pressure conditions. A backflow prevention assembly, typically a reduced pressure zone (RPZ) or double check valve assembly, is installed at the point where the sprinkler system connects to the water supply to prevent this.
Most municipal water utilities require a backflow prevention assembly as a condition of water service to any building with a fire sprinkler system, not just as a fire code requirement.
Common Assembly Types
- Double Check Valve Assembly (DCVA): used for lower-hazard cross-connections
- Reduced Pressure Zone Assembly (RPZ or RPZA): provides a higher level of protection and is required for higher-hazard connections in many jurisdictions
- Detector check assemblies: allow the water utility to detect unauthorized water use on the fire line
Testing & Compliance
Backflow prevention assemblies require annual testing by a certified backflow tester in most jurisdictions, with results submitted to the local water utility or health department. Failing to test on schedule can result in the water utility restricting or shutting off water service to the building.
Frequently Asked Questions
Is backflow prevention part of my fire sprinkler system or my plumbing?
It sits at the connection point between the two, so responsibility can vary by building. Most water utilities hold the property owner responsible for testing regardless of which contractor installed it.
How often does a backflow preventer need to be tested?
Annually, in most jurisdictions, though local water utility requirements can vary. Check with your local water authority for the exact schedule.
What happens if my backflow assembly fails a test?
A failed assembly typically must be repaired or replaced and re-tested promptly, since continued water service is often contingent on a passing test.
Related Services
Need Backflow Testing or Installation?
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