What is a cross connection?

The correct response identifies a cross connection as a dangerous link between potable (safe) and unsafe water. This definition is important in the context of sanitation and safety because a cross connection can lead to contamination of the potable water supply. When an unsafe or non-potable source of water is connected to the drinking water system, there is a risk that contaminants, such as chemicals, bacteria, or other harmful substances, could flow back into the potable supply, primarily due to changes in pressure or backflow. This makes it critical for public health to manage and prevent such connections in plumbing systems.

The other choices do not accurately represent a cross connection. A safe link between water sources does not encapsulate the risks associated with cross connections. An acceptable connection for water drainage does not pertain to the issue of potable water safety, as drainage connections are designed for handling wastewater, not securing clean drinking water. Lastly, describing a cross connection as a method of filtering water is misleading, as the focus should be on preventing contamination, not filtering, which involves different processes and equipment.