What is a cross-connection?

A cross-connection is defined as a physical link between safe water and dirty water, which poses a significant risk for contamination. This situation can occur when there is a direct connection between the potable water supply and a source of pollution, such as wastewater, chemicals, or other contaminants. If there's a drop in water pressure in the safe water line, it can create a siphoning effect, allowing contaminated water to flow back into the clean water system, potentially leading to serious health issues.

Understanding this concept is crucial for creating safe drinking water systems and preventing waterborne illnesses. Maintaining proper separation between clean and dirty water sources, through plumbing design and the use of backflow prevention devices, is necessary to protect public health.