Water can carry vectors of disease. Waterborne diseases are conditions (meaning adverse effects on human health, such as death, disability, illness, or disorders) caused by pathogenic micro-organisms that are transmitted in water. These diseases can be spread while, drinking water, showering, bathing, washing, or by eating food exposed to contaminated water.
In drinking water micro-organisms causing diseases that characteristically are waterborne prominently include protozoa and bacteria, many of which are intestinal parasites or viruses. While diarrhea and vomiting are the most commonly reported symptoms of waterborne illness, other symptoms can include skin, ear, respiratory, or eye problems. Furthermore, there are multiple micro-pollutants, such as pesticides, disinfection by-product but also taste or odour, that can harm infants considerably.