What contaminant does the Total Coliform Rule monitor in drinking water?

The Total Coliform Rule specifically focuses on the presence of coliform bacteria in drinking water. Coliforms are a group of bacteria, and their presence is an indicator of potential contamination by fecal material and pathogens. Monitoring for coliform bacteria helps ensure the safety of drinking water because these bacteria can signal that harmful microorganisms may also be present.

In contrast, the other options represent different types of contaminants that are monitored under other regulations or rules. Pesticides, for example, are assessed for their specific impacts on health and environmental safety, while heavy metals and nitrates are also important water quality concerns but are governed by entirely different standards and regulations under the Safe Drinking Water Act.