Microbial Contaminants Bacteria, viruses, and parasites can cause diseases like diarrhea, cholera, and giardiasis. These pathogens often enter water through sewage, animal waste, and untreated sources.
Practice Advice: Boil water or use a reliable water filter to remove microbial contaminants, especially when traveling or using untreated water sources.
Scientific Evidence: Studies by the World Health Organization (WHO) confirm that microbial contamination is a leading cause of waterborne diseases, particularly in developing countries.