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1. Human Health We all drink water that comes from a source: this may be a lake or local river. In countries that have poor screening and purification practices, people often get water-borne disease outbreaks such as cholera and tuberculosis. Every year, there are an estimated 3–5 million cholera cases and 100,000–120,000 deaths due to cholera. (WHO estimates that only 5–10% of cases are officially reported.) In developed countries, even where there are better purification methods, people still suffer from the health effects of water pollution. Take toxins emitted by algae growth for instance: this can cause stomach aches and rashes. Excess nitrogen in drinking water also pose serious risks to infants.
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