Backflow assemblies must be tested when they are installed and at least annually. The City of Lynchburg sends notices to customers reminding them when the annual test is due. The customer must contact a certified tester from the City of Lynchburg's tester list to perform the test. The test must be submitted to the Department of Water Resources. If the repair work or maintenance is performed on a backflow prevention assembly, a certified tester must retest the assembly immediately after repairs and submit test reports to the Department of Water Resources.