Which of the following describes cross connection hazards?

Cross connection hazards refer to situations in which a link exists between a potable (safe drinking) water supply and a source of contamination or non-potable water. This scenario can lead to a risk of backflow, where contaminated water reverses its flow and enters the clean water supply.

A customer premise that poses potential dangers if backflow occurs correctly captures the essence of cross connection hazards. If a backflow event happens at a location where potentially contaminated water might be mixed with the drinking water, serious health risks arise. This could include contamination from a variety of sources such as irrigation systems, chemical plants, or residential water systems where chemicals might be present.

The other options do not adequately describe cross connection hazards. A facility that presents no risk to water supply does not involve any potential for backflow contamination. A location where water is extracted from the ground typically refers more to groundwater extraction rather than backflow issues. A measurement device used in water supply systems does not pertain to cross connections but rather to monitoring and control processes within water systems.