What is the legal basis for a local cross connection control program?

The Safe Drinking Water Act of 1986, and Washington State Administrative Code (WAC 246-290-490) requires the Water District to administer a Cross Connection Control Program that will protect the drinking water supply, and to coordinate with the Local Authorities that protect the drinking water supply from possible backflow hazards within the plumbing system of buildings.

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1. What is a cross connection?
2. What is Backflow?
3. What are common examples of cross connection hazards (source of contamination) that need to be protected with a backflow preventer?
4. Why is a backflow preventer necessary?
5. What is the legal basis for a local cross connection control program?
6. Do I currently have adequate backflow protection? And, how can I find out?
7. What is my liability as a building owner property manager and water purveyor?
8. What are types of backflow protection?
9. How often do backflow assemblies have to be tested?
10. Who can test the backflow assembly?
11. What to do if my backflow assembly fails the annual test?