Why are biological and chemical a problem in contaminants water?

Biological contaminants in water can include harmful microorganisms like bacteria, viruses, and parasites that can cause diseases when consumed. Chemical contaminants refer to substances like heavy metals, pesticides, and industrial chemicals that are harmful to human health when present in water at elevated levels. Both types of contaminants can lead to health issues and waterborne diseases if not properly treated or removed from the water supply.