Backflow occurs when water flows in the reverse direction within your plumbing system, potentially allowing contaminants to enter your clean water supply. This can happen due to a sudden drop in water pressure, such as during a water main break or when firefighting hydrants are in use. Without proper protection, harmful substances like fertilizers, chemicals, and bacteria can mix with your drinking water, posing serious health risks. Backflow prevention devices act as a barrier, stopping contaminated water from flowing backward and keeping your water supply safe. Whether required by local codes or recommended for added protection, these systems are a smart investment in your home’s plumbing safety.