Do I need a Backflow Prevention Assembly at my home?

Most residential units do not need a Backflow Assembly. However, if you have a fire sprinkler system or underground irrigation system, you must have a backflow prevention assembly on those systems. The Building and the Water Departments evaluate new buildings as to the degree of hazard and type of backflow protection required. For more information please contact the Public Works Department at 425-831-4919.

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1. What are "cross-connections" and "backflow"?
2. What causes backflow?
3. What problems can result?
4. Can cross-connections be avoided?
5. What is an "Approved Backflow Prevention Assembly"?
6. Do I need a Backflow Prevention Assembly at my home?
7. What if I have a Backflow Prevention Assembly?
8. How can I find a BAT to test my assembly?
9. What regulations apply to Cross-Connection Control?