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 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 most local plumbing codes and should be inspected and tested annually by a licensed plumber to ensure they are functioning correctly.
The lifespan of a backflow preventer can vary depending on factors like water quality, usage, and maintenance. With regular professional inspections and any necessary repairs, a backflow preventer can continue to reliably protect your home for many years. However, over time the internal components may wear out and need replacement, so it's important to have a plumber evaluate the device periodically.