What causes backflow to occur?

Backflow occurs when water flows in the opposite direction from its intended path, often due to changes in pressure within a Plumbing system. This can happen due to factors like a sudden drop in water pressure, which can be caused by burst pipes or fire hydrant use, or when there is a higher pressure in the wastewater system, pushing contaminated water back into clean water lines. Additionally, improper installation of plumbing fixtures or backflow prevention devices can also contribute to backflow incidents.