Specializing in professional backflow testing solutions, Test Pro brings over 25 years of experience and plumbing industry expertise to each residential and commercial project we perform. Our well-trained plumbers are certified in plumbing inspections and cross connection, permitting our company to test and certify your devices.In the state of Illinois, yearly backflow testing is required to maintain safe standards for residential and commercial structures by protecting drinkable water supplies from harmful toxins such as fertilizer, pesticides, flame protection chemicals and other fairly widespread products.