Which of the following is a common sign of backflow in a plumbing system?

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Discolored water or a foul odor is indeed a common sign of backflow in a plumbing system. Backflow occurs when water flows in the opposite direction of its intended flow, often due to changes in pressure. This reversal can allow contaminants or water from an unsanitary source to mix with the clean water supply. As a result, the presence of discolored water, which could range from brown to greenish hues due to rust, sediment, or other pollutants, is a strong indicator of backflow. Additionally, a foul odor may signify that harmful bacteria or chemical contaminants have been introduced into the system, further underscoring the risk of backflow.

Identifying these symptoms is crucial in preventing health hazards associated with contaminated water. Thus, monitoring for any changes in the appearance or smell of water can help in recognizing backflow issues early on and taking appropriate corrective measures.