Scarsdale's estates are famous for their grounds — sprawling lawns, gardens, and irrigation systems that run all season. Nearly every one of those systems has a backflow preventer, and New York State requires each device tested annually by a certified tester, with proof filed to the water supplier. Guardian Backflow Testing LLC is the specialist Scarsdale calls: a $75 flat rate per test covering the full certified test, NYS paperwork, and filing. With 35+ years of experience and ABPA membership, we handle single devices and multi-device estates with the same careful, white-glove service.