We will come out once a year to test your backflow device to ensure that it meets the standards of the Washington State Department of Health. It is required by law in Washington that your backflow device is tested at least once a year by a certified tester to ensure no water from your sprinkler piping siphons into the public potable water supply. We are a certified Backflow Assembly Tester. We will send you one copy and mail one copy to your water company on your behalf. We are also able to repair or replace your backflow assembly should it fail.