Do you need a permit for replacing backflow device on the water service?

• A. Yes
• B. No
• C. Only for certain devices
• D. Only in new construction

Answer: (B)

The key idea is that permits for backflow devices are tied to creating a new installation or changing the system configuration. If you’re simply replacing an existing backflow preventer with an identical unit on the same water service and you aren’t altering the piping or moving the device, this is treated as a like-for-like replacement rather than a new installation. In that scenario, a permit isn’t required. However, you still must follow the proper installation procedures and have the device tested after replacement to confirm it functions correctly and provides the required protection. If the replacement involved a different model or size, or required moving the device or changing the service, a permit would typically be needed. Always check local authority requirements, but for a straightforward, same-unit replacement, a permit is not required.