What is the consequence of not using a backflow preventer where required?

The consequence of not using a backflow preventer where required is the potential contamination of potable water. Backflow preventers are crucial devices designed to prevent the reverse flow of water in plumbing systems, which can happen due to a drop in water pressure or other disruptions. When backflow occurs, it can allow non-potable water—containing chemicals, bacteria, or other harmful substances—to mix with the clean, potable water supply. This can lead to serious health risks for individuals consuming or utilizing that water, making it vital to comply with backflow prevention requirements to protect public health and ensure the safety of drinking water.