What is defined as a physical link between a potable water system and a system of unknown quality?

A cross connection is defined as a physical link between a potable water system, which is designed to deliver safe drinking water, and another system that may contain contaminants or unknown quality water, such as irrigation systems or industrial processes. This connection poses a significant risk because if there is a drop in pressure within the potable water system, it can create a backflow situation where potentially unsafe water can flow back into the clean water supply.

Preventing cross connections is crucial in water supply management to protect public health. Regulations often require backflow prevention devices or methods to be installed at identified cross connections to ensure that drinking water remains uncontaminated.

Understanding the concept of cross connections is vital for water operators, as managing and preventing these connections is a key responsibility in maintaining safe drinking water. This knowledge helps operators enforce safety standards and implement appropriate measures to avoid contamination of potable water systems.