How does backflow occur?
Backflow may occur due to high pressure on the customer side, or low pressure in the water system. Backflow through a cross-connection can contaminate the potable water in a building, on a block, or throughout an entire water system.

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1. What is backflow?
2. How does backflow occur?
3. What is backflow prevention?
4. Who is Required to Have a Backflow Device?
5. Must I have my backflow prevention assembly inspected annually?