The answer to 'why is my backflow preventer' is that a backflow preventer is a critical plumbing device that prevents contaminated water from flowing back into your home's clean water supply. Common causes for backflow preventer issues include wear and tear, improper installation, and debris buildup. Symptoms may include water flow problems, water discoloration, or even backflow into the home.
In many cases, you can troubleshoot and fix minor backflow preventer problems yourself, such as cleaning the device or replacing worn washers. However, more complex issues like a malfunctioning check valve or a need for full replacement should be handled by a licensed plumbing professional. They have the specialized tools and expertise to properly diagnose and repair your backflow preventer to ensure your home's water quality and safety.