Backflow Prevention

Backflow Prevention Assembly
Backflow prevention assemblies protect the drinking water supply from contamination by preventing the reverse flow of untreated liquids from the customer's property back into the public supply line.

Customers are required to install and properly maintain backflow prevention assemblies on their water service when additional water sources are present on their property, or if a specialized type of water use exists. Additional water sources include wells or if you are in the Grants Pass Irrigation District. Examples of specialized water use are irrigation systems or fire sprinkler systems.

All backflow prevention assemblies are required to be tested at least annually to ensure they are functioning properly. Backflow assemblies that fail annual testing are required to be repaired or replaced.
Double Check Valve Assembly
Reduced Pressure Backflow Assembly
Assembly Testing
Commercial, multiple-family and public customers are contacted each year by letter informing them it is time to test their assemblies. These customers are responsible for obtaining a privately certified backflow tester, having the test performed, and completing all necessary assembly repairs.

View a list of certified backflow testers.
Assembly Fees
Single-family residential customers are billed a monthly fee of $2 per assembly. This fee is used to provide funding for a city-administered contract for the annual testing and minor repair of all single-family residential assemblies.