What is a sign of contamination in a water main?

The presence of unusual colors or odors is a clear sign of contamination in a water main because these indicators suggest that there may be unwanted substances or pollutants in the water supply. For instance, a change in color—such as a reddish or brownish tint—might indicate rust or sediment, while any unusual odor could point to organic or chemical contaminants. Safe drinking water is typically expected to be clear and devoid of any off-putting smells; thus, the presence of these anomalies warrants immediate investigation to ensure the safety and quality of the water. Monitoring for these changes is crucial for public health and safety, and utilities often conduct routine testing to quickly identify and address potential contaminants.