BACKFLOW DEVICE TEST APPOINTMENT IN SF. Pleas fill free to Call 415-913-8941 or Click on open time to schedule a backflow device test in San Francisco. Test cost $125 per backflow device tested and includes SFDPH annual tag. A discount of $20 is given per test for additional devices tested at the same time. email 1BackFlowPlumbing@gmail.com, CSLB#807692 ARE YOU LETTING SAVINGS GO DOWN THE DRAIN? Call to book a Plumbing appointment in San Francisco to Palo Alto today. ph# 415 913 8941 If a pipe springs a leak, you need to act quickly. Keep from having to pay an exorbitant water bill by calling on a skilled plumber from 1 Backflow Plumbing. Residents of San Francisco, CA, Redwood City, CA and surrounding areas count on us for leak repair services because we go the extra mile to meet their needs. If one of your pipes is leaking, time is the enemy. The longer you wait to plug the leak, the worse the water damage will get. Prevent the need for costly repairs by turning to 1 Backflow Plumbing for leak detection services. We use state-of-the-art technology to locate leaks quickly. After we patch it up, you won't have to worry about the leak happening again. We service sewer, water and gas lines.