Each tester’s competency is certified by a national agency every 3 years. Testers use specialized testing equipment that is calibrated every year. As required by the State, the City also evaluates each tester to make sure they meet standards. The test does not take long when done by an experienced tester. The device being tested must maintain pressure - hold back water flow – at each check valve and meet strict specifications. Only test reports from testers on the list of certified testers are accepted by the City of Santa Rosa.