What is a cross connection?

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A cross connection is any connection to a water source which could possibly cause contamination to that water source. Normally this condition exists when pressure in the system is lost and water is allowed to siphon back into the system. An example of a cross connection would be a submerged hose filling a tank. If a failure in the system causes loss of pressure in the system, the water in the tank would siphon back into the distribution system. Since this is a public system, it would not only affect your system, but the public’s as well. Cross connections are also a violation of the Southwest Water Authority’s Rules and Regulations. It is extremely important that each customer check their system to make sure a cross connection does not exist because a pressure drop in our system could create a very serious contamination problem. Even though we have backflow preventers, they are mechanical and subject to failure.