Backflow testing is a process that involves testing the backflow prevention devices installed in a building’s water supply system to ensure that they are functioning correctly and preventing contaminated water from flowing back into the municipal water supply. The testing process typically involves shutting off the water supply, inspecting and testing the backflow prevention device, subjecting it to a series of pressure tests, inspecting the surrounding plumbing, and making any necessary repairs or replacements. Backflow testing is required by law in most jurisdictions and failure to comply can result in fines, penalties, and even the loss of a business license.