Every day, 4,000 children die from diarrhoea caused by dirty water. This is just a proportion of the 4 million deaths from water-related diseases and poor sanitation each year.
Worldwide, more than 1 billion people do not have a supply of safe water, and more than 1 billion more live without even basic sanitation.
In emergencies, many more lives are put at risk by inadequate water supplies and poor sanitation. It's estimated that each person needs 15 litres of water per day for drinking, cooking, and washing in an emergency. This makes providing clean water a massive task requiring the sort of specialist skills and equipment Oxfam has.