How do I know if I need to install a backflow preventer?

Residential customers are only required to install a backflow preventer if there is a potential cross-connection hazard. It is the customer's responsibility to notify us if an irrigation system or pool is installed. Backflow requirements vary for commercial/industrial customers based on the business's water use. Ridgefield's staff reviews newly established commercial/industrial water accounts to assess the degree of backflow hazard and notifies businesses about backflow requirements.

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1. Why is backflow prevention important?
2. I received a letter saying I need to install a backflow preventer. How do I do that?
3. I am a renter. Why did I receive a letter about the backflow preventer?
4. I received a letter to test my backflow preventer at a home/property I sold previously. How do I update my information?
5. Why do backflow preventers have to be tested each year?
6. Is there a general compliance schedule and process?
7. Do backflow testers work for the City of Ridgefield?
8. How do I know if I need to install a backflow preventer?
9. I don’t use my irrigation system. Do I still have to test and maintain my backflow preventer?