The answer to 'backflow preventer replacement frequency' is that backflow preventers should typically be replaced every 5-10 years, depending on the type and usage. Backflow preventers are critical devices that prevent contaminated water from flowing back into the clean water supply, so it's important to keep them well-maintained and replaced as needed.
The exact replacement frequency can vary based on factors like the backflow preventer model, water quality, and how often the system is used. Annual testing and inspection by a licensed plumber is recommended to ensure the backflow preventer is functioning properly. If any issues are found, the backflow preventer should be repaired or replaced as soon as possible to protect the home's water supply.