Which of the following indicates a possible water quality issue in a distribution system?

A sudden change in water color is a significant indicator of potential water quality issues within a distribution system. Such a change can arise from various factors, including the presence of contaminants, sediment disturbance, or chemical reactions occurring within the water. For instance, if rust or sediments are stirred up in the pipes, it can lead to discoloration, which directly signals a problem that requires investigation to ensure the water remains safe for consumption.

On the other hand, high pressure readings generally suggest that the system is functioning correctly and may indicate well-working pumps and infrastructure. Consistent flow rates indicate stability in water delivery rather than problems, and no fluctuations in demand typically reflect a steady consumption pattern devoid of unusual spikes that might hint at underlying issues. Thus, none of these scenarios would raise immediate concerns regarding water quality as a sudden change in color would.