I recently had one installed and it was $300. Testing was an additional $25. My water is a single source for both potable and irrigation.
Portion of a letter from my water company. "Florida Dept of Environmental Protection (FDEP) administrative code, subsection 62-555-630. Backflow assemblies shall be installed and certified by code. The assembly shall be installed by a licensed contractor certified in the State of Florida to install and test backflow assemblies."
I think repairs have to be done by a licensed contractor as well.
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