Having all backflow prevention device workers certified is essential in ensuring that the tester stays current with changing regulations, testing procedures and knowledge of backflow prevention and cross connection control. Backflow prevention devices prevent contaminants from entering the drinking water system to protect the public health. There is nothing more important than protecting public health. We must be sure that those who are testing these essential backflow prevention devices are testing the devices properly and that the tester has the knowledge necessary to determine when there is a cross connection. The DPOR certification for Backflow Prevention Device Worker should absolutely be required.