Backflow Assemblies
Backflow prevention assemblies, devices, and/or methods are utilized on water supply piping to protect public water supplies from backflow hazards.
The assemblies protect against hazards caused by backpressure or back-siphonage conditions that could cause pollutants or contaminants to backflow into the public water supply and/or the water user’s system.
Source How to choose and install a backflow prevention assembly | Portland.gov
It keeps the city or well water from leaching in your system in the case of disaster or contamination of the water supply. Also prevents water from escaping from your plumbing system to the main supply when if water supply is turned off for some reason
Hope this answers your question,
Keith
Backflow pertains to potable (drinkable) water that cannot be contaminated by irrigation, pollution, or siphon issues. It is a protective system that requires additional training and certifications for plumbers or technicians and varies by state. In Ohio, the state governs certified backflow testers, and they must pass a State of Ohio test, and hands-on skills are reviewed every 3 years for renewal. Backflow assemblies and devices must meet strict calibration standards that must be maintained regularly. Apartment buildings, hospitals, irrigation systems for farms and even lawn sprinkler systems, etc. need backflow testing and maintenance. Every state and municipality will have information pertaining to health and safety for any kind of plumbing. Our company is State of Ohio Backflow Tester - cert# 6028
