Waterborne disease

Waterborne diseases are diseases caused by pathogenic micro-organisms, such as bacteria, viruses, protozoa, and parasitic worms, that are transmitted through contaminated water. Many of these micro-organisms are intestinal parasites, invading the tissues or circulatory system through walls of the digestive tract. Various other waterborne diseases are caused by viruses. Other important classes of waterborne diseases are caused by metazoan parasites. Typical examples include certain Nematoda, or "roundworms," which may result in diseases such as Dracunculiasis or even guinea worm disease. Additional classes of waterborne metazoan pathogens include Schistosomatidae, a family of blood flukes. In addition to pathogens, water contamination may also be driven by chemical pollutants such as volatile organic compounds (VOCs). This includes benzene, toluene, ethylbenzene, and xylenes, which can enter water lines through industrial dumping, pipeline leaks, jet fuel spills, or heat-damaged plastic pipes.

These diseases can spread through bathing, washing, drinking, or by eating food exposed to contaminated water, especially prevalent in developing countries that lack clean water, sanitation, and hygiene (WASH). While diarrhea and vomiting are the most commonly reported symptoms of waterborne illness, other symptoms can include nausea, stomach cramps, fever, and skin, ear, respiratory, or eye problems. Exposure to VOC-contaminated water has been associated with headaches, nausea, tumor formation, and increased cancer risk, including leukemia.

Therefore, reliable access to clean drinking water and sanitation is the main method to prevent waterborne diseases. This includes improving sanitation systems, chlorination, vaccination, and sustainable technologies, like solar-powered desalination. Infrastructure improvements, such as replacing damaged plastic piping with metal alternatives in wildfire-prone areas, may also reduce contamination risks. Billions of people worldwide lack access to clean water, making it vital for prevention. Waterborne diseases contribute significantly to mortality and disability, especially in developing regions. Each consequence places greater economic strain on affected communities. The consequences of climate change also increases risk because of the increased possibility of droughts and flooding, which can spread contaminants and disproportionately affect vulnerable populations. Surveillance systems, such as those maintained in the United States, help monitor and prevent outbreaks. Historically, advances in sanitation, filtration, chlorination, and microbiology may help to understand and control of these diseases.