Which of the following are common microbial contaminants found in potable water?

The presence of bacteria, viruses, and protozoa in potable water is a significant concern as these are common microbial contaminants that can pose serious health risks. Each of these groups contains various pathogens that can lead to illnesses when ingested. For example, bacteria such as Escherichia coli and viruses such as norovirus are well-known for causing gastrointestinal diseases. Protozoa such as Giardia and Cryptosporidium can also lead to severe digestive issues, particularly in immunocompromised individuals.

While other options mention various contaminants, they do not accurately represent the microbial nature of the common contaminants typically monitored in drinking water. Fungi, yeast, and mold, while present in the environment, are not primary concerns in potable water systems. Pesticides and heavy metals are chemical contaminants, not microbial, hence they do not belong in the same category. Understanding the types of microbial contaminants is crucial for developing effective water treatment and public health strategies to ensure safe drinking water.