Water is needed for life, so everyone needs clean drinking water. Yet access to clean drinking water is a problem in many countries.

Some countries do not have enough water for their peoples' needs, and in many countries the water is often too dirty to drink.

This can happen through pollution from fertilisers used in farming, factory waste and domestic sewage.

Dirty water spreads a whole range of diseases, from diarrhoea, cholera and typhoid from drinking polluted water, to malaria and river blindness from infection-carrying insects breeding in stagnant water.