Backflow Testing & Prevention in La Cañada Flintridge, CA

California requires backflow prevention assemblies on water supply connections where there is a risk of non-potable water entering the domestic supply. For La Cañada Flintridge residential properties, the most common backflow assembly is on the irrigation system supply: a pressure vacuum breaker (PVB) or reduced pressure zone (RPZ) assembly at the irrigation supply valve, preventing irrigation water, which may contain fertilizer or soil contaminants, from being siphoned back into the domestic supply during a pressure event.

Most La Cañada Flintridge retail water utilities, including Crescenta Valley Water District and La Cañada Irrigation District, require annual testing of backflow prevention assemblies and a certification report filed with the utility. Testing must be performed by a certified backflow tester. We hold the required certifications and file the passing report with your specific utility as part of the service.

When a backflow assembly fails its annual test, it must be repaired or replaced and re-tested before a passing certification can be issued. Common failure modes include a relief valve that is stuck open or closed, a check valve that no longer holds pressure differential, or a broken spring in the first check. We repair or replace failing assemblies on the same visit when parts are available.