Annual backflow testing is essential—and legally required—in New York to protect the public water supply from contamination. A backflow prevention device ensures that water flows in the proper direction, preventing pollutants, chemicals, or other hazardous substances from entering the clean water system. Over time, these devices can wear out or malfunction, which is why the New York Department of Environmental Protection (DEP), New York State Department of Heath (NYSDOH) And several local water districts mandate yearly testing by a certified backflow tester. Regular testing not only keeps your property in compliance with city, town or village regulations, but also safeguards your family, customers, and community by ensuring that your drinking water remains safe and clean.