Lawn sprinkler systems can backflow contaminated water back into your home drinking water and into the public water system. Since there is the potential for contamination, all lawn sprinkler systems must have an appropriate backflow preventer installed. Backflow preventers must be an approved device on the USC Foundation for Cross Connection Control and Hydraulic Research. A complete list of approved devices can be found here (PDF) .
As of March 28, 2018, double check valve assemblies are no longer approved for lawn irrigation systems (PDF).
All assemblies must be tested upon installation, and at a minimum frequency of once per year. The law requires all testing be performed by a State licensed tester, and the results sent to the Water Department Superintendent.
If you have any questions about the City of Blackfoot's requirements for lawn sprinkler systems please call the office at (208) 785 8608