It has been estimated that waterborne diseases worldwide account for how many illnesses per year?

The estimation that waterborne diseases account for 20 million illnesses per year reflects a more conservative figure based on research regarding the prevalence of such diseases globally. This figure is supported by numerous studies and reports from health organizations that focus on the health burden posed by unsafe drinking water and inadequate sanitation.

Waterborne diseases are typically caused by pathogens present in contaminated water sources, leading to a range of illnesses, particularly in developing regions with limited access to clean water and sanitation facilities. While the actual number can vary based on reporting, outbreaks, and improvements in sanitary conditions, the figure of 20 million provides a grounded understanding in a global context.

Other options suggest significantly higher estimates for annual illnesses attributed to waterborne diseases, which may not align as closely with available data in epidemiological studies. Therefore, the figure of 20 million is considered a sustainable and realistic estimate reflecting ongoing public health challenges.