Which of the following describes an effect of backflow?

The introduction of harmful pathogens is a significant effect of backflow. Backflow occurs when water flows in the opposite direction from its intended flow, often due to changes in pressure within a water system. This reverse flow can lead to contaminants from non-potable sources, such as sewage or industrial fluids, entering the potable water supply.

When backflow occurs, these harmful pathogens can mix with clean drinking water, posing serious health risks to consumers, including the potential spread of waterborne diseases. This is why backflow prevention measures are critical in maintaining public health and preventing contamination in drinking water systems. Understanding this effect highlights the importance of ensuring proper backflow prevention devices are in place within water supply systems to protect against these dangers.