What regulations govern backflow devices?

Currently, the State Water Resources Control Board (SWRCB) regulates backflow devices through Title 17 of the California Regulations Related to Drinking Water.  This will soon be replaced by the SWRCB’s Cross-Connection Control Policy Handbook. The Universal Plumbing Code, in addition, outlines the regulations for backflow devices.

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1. Why do I need a backflow device?
2. What regulations govern backflow devices?
3. Where do I get a backflow device?
4. What type of device do I need?
5. Who can install a backflow device?
6. How can I protect the backflow device against theft and vandalism?