What are "cross-connections" and "backflow"?

A "cross-connection" is any actual or potential physical connection between a public water system or the consumer's water system and any source of non-potable liquid solid, or gas that could contaminate the potable water supply by backflow. "Backflow" means the undesirable reversal of flow of water or other substances through a cross-connection into the public water system or consumer's potable water system. An Irrigation system is an example of a low hazard cross-connection. An example of a high hazard cross-connection would be a garden hose with the flowing end submerged in a container of pesticide. 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?