Cross Connection

A cross-connection is an actual or potential link between the potable water supply (water safe for human consumption) and a non-potable source (any other type of liquid, gas or substance not fit for consumption and that can affect water quality).  A cross-connection can be avoided by eliminating the link between the two sources.  If the link cannot be removed, then the potable water supply must be protected using a back-flow prevention device.  The most common cross-connection is a typical garden hose, which is left submerged in a volume of water or other fluid (i.e. a garden hose left in left in a swimming pool). Other cross-connections include kitchen sprayers in a sink filled with dirty water, irrigation systems, boilers and other appliances supplied by water.

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