What can be a consequence of having a cross-connection in a plumbing system?

Having a cross-connection in a plumbing system can lead to the contamination of the potable water supply. A cross-connection occurs when there is a direct physical connection between the drinking water supply and another source of contamination, such as wastewater or chemicals. This is particularly concerning because if there is a drop in pressure in the potable water system, it can create a backflow situation, allowing contaminated water to flow back into the clean drinking water supply.

This risk is why cross-connection control is crucial in plumbing design and maintenance. Regulations often require specific preventive measures, like using backflow prevention devices, to safeguard public health by ensuring that potable water remains uncontaminated.

Improved water pressure, reduced flow rate, and increased water hardness do not directly arise from cross-connections. Instead, they may relate to issues of plumbing design, water quality, or other factors unrelated to the risk of contamination presented by improper cross-connections.