The answer to 'how long does backflow preventer last' is that a properly installed and maintained backflow preventer can last 10-15 years or more. Backflow preventers are critical plumbing devices that protect your home's water supply from contamination by preventing water from flowing back into the public water system. They are required by building codes in many areas and must be regularly tested to ensure they are working correctly.
The lifespan of a backflow preventer depends on several factors, including the quality of the device, the water pressure and quality in your area, and how often it is serviced. Proper maintenance, such as annual testing and cleaning, can help extend the life of your backflow preventer. However, over time, the internal components can wear out and the device may need to be replaced to ensure continued protection of your water supply.