How is a 'cross-connection' defined?

A 'cross-connection' is specifically defined as a connection between a potable water supply and a non-potable source. This is critical in plumbing and water safety, as it represents a significant risk for contamination. The significance of this definition lies in the understanding that any link between safe drinking water and sources that could potentially introduce harmful substances, such as irrigation systems, process water, or sewage, creates pathways for pollutants to enter the potable supply.

Preventing cross-connections is essential in maintaining the integrity of drinking water systems. Regulations and plumbing codes are often in place to ensure that proper backflow prevention devices are used in situations where cross-connections might occur. Recognizing this definition helps ensure that safety measures are put in place to protect public health and the quality of water supplies.

The other answers, while related to plumbing, do not specifically address the exact definition of a cross-connection as stated. They each refer to other aspects of plumbing systems or functions, but understanding the defined nature of a cross-connection is crucial for those involved in plumbing and water management.