What is cross-connection in plumbing?

A cross-connection in plumbing is specifically defined as an actual or potential connection between a potable water supply, which is safe for drinking, and a non-potable source that can introduce contaminants into the drinking water system. This definition is crucial for understanding water safety and public health standards.

Cross-connections can occur in various situations, such as when a hose is submerged in a bucket of contaminated water or when a plumbing fixture is improperly connected to non-potable sources. The risk is that any backflow occurring during pressure changes can draw harmful substances into the clean water supply, which can lead to serious health hazards.

Understanding cross-connections is essential for plumbers to ensure that systems are designed and installed in a way that prevents contamination of drinking water. Proper protection methods, such as air gaps and backflow prevention devices, are essential components of plumbing codes to safeguard the integrity of the potable water supply.