In terms of water quality, what is a possible consequence of high levels of trihalomethanes in drinking water?

High levels of trihalomethanes (THMs) in drinking water are associated with significant health risks. Trihalomethanes are a group of by-products that can form when chlorine, used for disinfecting drinking water, reacts with organic matter present in the source water. Prolonged exposure to elevated concentrations of THMs has been linked to serious health concerns, including an increased risk of certain cancers and development issues. Therefore, understanding the implications of THM presence in water is crucial for public health and safety, which underscores the importance of monitoring and regulation of these substances in drinking water supplies.

Other options, such as increased taste and odor, cloudiness, and increased water pressure, do not appropriately reflect the primary concern associated with elevated THM levels. While these factors can affect water quality, they do not represent the serious health implications posed by high THM concentrations.