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By definition, a backflow is an undesirable reversal of flow of liquid, gas or solid into the potable water supply.
The water supply systems are maintained at significant pressure to enable water to flow. When pressure fails or is reduced, the pipe may allow contaminated water from the ground, storage, or other sources to be drawn up into the system.
Backflow preventers are used whenever there is a risk of contaminated fluids entering the water supply system.
The County of Orange has developed a list of Backflow Prevention Device Testers that are certified by the Orange County Health Care Agency, Division of Environmental health.
Please note: Although the testers are listed under a specific city or County area they are certified to test throughout Orange County. A business license and/or plumbing permit may be required by the city in which the work is being conducted. Also, State law requires that anyone who contracts to do construction work be licensed by the Contractors State License Board in the license category in which the contractor is going to be working if the total price of the job is $500 or more (including labor and materials). A State Contractors license is not required for the testing of backflow devices as long as the total cost of the work is under $500.