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In the US, the Environmental Protection Agency (EPA) holds local water suppliers responsible for maintaining a certain amount of purity in potable water systems. Many states and/or local municipalities require annual testing of backflow prevention assemblies.  The Texas Commission on Environmental Quality (TCEQ) requires ALL local municipalities across the state of Texas to develop and maintain a Backflow Prevention Program, under which all backflow prevention assemblies must be maintained and tested according to local ordinance.  FAILURE TO COMPLY MAY RESULT IN THE WATER PURVEYOR DISCONTINUING WATER SERVICE TO YOUR BUSINESS OR HOME.   

A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow.  In public water systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture.  Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened).  Reduced pressure in the pipe may allow contaminated water from the soil, from storage, or from other sources to be drawn up into the public water system.  A specialized backflow preventer valve may be installed at strategic locations in the plumbing system wherever there is a risk of contaminated fluids entering the water supply pipes.  Because these valves use moving parts, they are often required to be inspected or tested periodically.