What can the presence of total coliform bacteria indicate in a water supply?

The presence of total coliform bacteria in a water supply is a significant indicator of potential contamination. Coliforms are a group of bacteria found in the environment, and while some types are harmless, their presence in drinking water suggests that the water may have been exposed to fecal material or other pathogens. This can indicate issues with the water source's safety, such as inadequate treatment or problems with the infrastructure, such as leaks or breaks in pipes. Monitoring coliform levels is a critical aspect of water quality testing, as it helps ensure the safety of drinking water for the public by flagging possible sources of contamination that need to be addressed.

Other options like high mineral content, excessive chlorination, and impaired taste pertain to different water quality concerns but do not specifically relate to the implications of coliform bacteria presence.