Backflow preventers are an important part of any plumbing system. They are designed to prevent contaminated water from entering the potable water supply. Backflow preventers are typically installed in areas where there is a potential for cross-connection between the potable water supply and a non-potable water source. The plumbers at backflowchicago.com specialize in testing, certifying, and repairing backflow preventers. These devices are essential for maintaining the integrity of various systems, including irrigation, swimming and hot tub pool fillers, and fire protection systems. In some cases, a backflow preventer may be required when there is another water source on the property, such as a pond, well, or river. Local plumbing codes mandate that backflow preventers be tested and certified annually by a cross-connection control specialist to ensure their proper functioning.