If Backflow Prevention Devices don't work properly, they can contaminate water. The town of Marana is asking homeowners to check theirs.

Allahabad University students develop device to check backflow after injection April 10, 2022 1 min. read 3 years ago ...

The Missouri Department of Natural Resources requires homeowners to have their irrigation systems tested for backflow each year.

Wichita residents who have an irrigation system connected to the City of Wichita’s water system must have their backflow device tested by Sept. 12 to avoid disconnection.