Tennessee Wastewater Operator Practice Exam

What is a cross connection?

1. A direct connection between potable water supply and a non-potable water supply

2. A type of water treatment process

3. A method to recycle wastewater

4. A valve used in plumbing systems

The correct answer is: A direct connection between potable water supply and a non-potable water supply

A cross connection is defined as a direct connection between a potable (drinkable) water supply and a non-potable (non-drinkable) water supply. This can create a pathway for contaminants to enter the clean water supply, posing a significant health risk. The primary concern with cross connections is that they can allow harmful substances, such as chemicals or biological pathogens, to be siphoned or backflowed into the potable water system, potentially leading to serious public health issues. This is why cross connections are heavily regulated and monitored in water supply systems. Understanding the nature of a cross connection is crucial for wastewater operators, as they play a pivotal role in maintaining the integrity of water supplies by preventing such connections from occurring. Measures like cross-connection control programs and backflow prevention devices are implemented to safeguard against this risk.