The purpose of a backflow prevention device is to keep unsafe drinking water from mixing with the potable water supply. A backflow prevention device is to be installed on:

• all residential irrigation systems;
• fire sprinkler systems;
• commercial facilities where chemicals are used;
• boiler systems; and
• other systems where drinking water could become contaminated.

Backflow Prevention helps the City of Coppell ensure a safe drinking water supply for its residents.