Backflow can contaminate an otherwise clean water supply. Sprinkler systems, swimming pools and even water heaters can push contaminated water back into your bathrooms and kitchens. With the mandatory annual testing of backflow systems in Los Angeles, ASA Plumbing, Inc. has become the premiere provider of backflow testing and repair. Is it time to test? Call ASA Plumbing, Inc. to speak to a qualified professional about scheduling a backflow test.