Waterborne disease
Illnesses from pathogens in contaminated water, a major global health burden.
Waterborne diseases are illnesses caused by pathogenic micro-organisms—including bacteria, viruses, protozoa, and parasitic worms—that are transmitted through contaminated water. These diseases can spread via bathing, washing, drinking contaminated water, or eating food exposed to such water, and they contribute significantly to mortality and disability worldwide, particularly in developing regions.
- field
- Public health, infectious disease
- known_for
- Transmission through contaminated water; major cause of diarrheal disease and child mortality in sub-Saharan Africa
- global_impact
- 2.1 billion people globally lack access to safe drinking water
Lore & Background
Waterborne diseases are caused by pathogenic micro-organisms such as bacteria, viruses, protozoa, and parasitic worms. Many of these are intestinal parasites that invade tissues or the circulatory system through the digestive tract. Other waterborne diseases are caused by viruses or metazoan parasites, including certain Nematoda (roundworms) that cause Dracunculiasis (guinea worm disease) and Schistosomatidae (blood flukes). Chemical pollutants such as volatile organic compounds (VOCs)—including benzene, toluene, ethylbenzene, and xylenes—can also contaminate water through industrial dumping, pipeline leaks, jet fuel spills, or heat-damaged plastic pipes, and have been associated with headaches, nausea, tumor formation, and increased cancer risk.
Reader's Guide
The most effective prevention for waterborne disease is reliable access to clean water, sanitation, and hygiene (WASH), including improved sanitation systems, chlorination, vaccination, and desalination. Infrastructure improvements, such as replacing damaged plastic pipes with metal ones in wildfire-prone areas, can reduce contamination risk. Climate change increases risk through droughts and floods, which spread contaminants and disproportionately affect vulnerable populations. Surveillance helps monitor and prevent outbreaks. Historically, advances in sanitation, filtration, chlorination, and microbiology have helped scientists understand and control these diseases. Around 56% of African countries lack systematic waterborne pathogen surveillance, so outbreaks often go unrecorded.
Did You Know?
- Waterborne diseases can be caused by bacteria, viruses, protozoa, and parasitic worms, including roundworms that cause guinea worm disease and blood flukes from the family Schistosomatidae.
- Chemical pollutants such as benzene, toluene, ethylbenzene, and xylenes can enter water lines through industrial dumping, pipeline leaks, jet fuel spills, or heat-damaged plastic pipes.
- Around 56% of African countries have no systematic waterborne pathogen surveillance, so outbreaks often go unrecorded.
More in Common Infections And Diseases 1-21
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