A cross-connection is defined as a connection between...

A cross-connection is crucially defined as a connection between a potable water source and a nonpotable water source. This definition is vital in water safety and public health contexts, as it poses significant risks of contamination. When there is a direct link between clean (potable) water used for consumption and water that may be contaminated or not safe for drinking (nonpotable), there is potential for backflow. Backflow can occur when there is a drop in water pressure that allows nonpotable water to flow back into the clean water supply, potentially introducing harmful pathogens and substances.

Understanding this helps emphasize the importance of proper plumbing practices and the installation of backflow prevention devices, which are critical to safeguard drinking water supplies. Such measures are essential for maintaining public health standards and ensuring the safety of community water systems, preventing diseases and health risks associated with contaminated water sources.