What country has the dirtiest water in the world depends on measurement like drinking water safety, surface water pollution, and wastewater treatment, but several countries consistently rank lowest for water quality. According to Environmental Performance Index and water quality reports, countries with dirtiest water often include Bangladesh, Pakistan, India, Democratic Republic of Congo, and Ethiopia, where access to safe drinking water is limited and surface water is heavily polluted by industrial waste, sewage, and agricultural runoff. Bangladesh is frequently cited for severe water contamination with arsenic in groundwater affecting millions, plus bacterial contamination. Pakistan and India face major river pollution, such as Ganges and Indus rivers with high levels of sewage, industrial chemicals, and plastic. In Africa, countries like Niger and Chad have very low access to clean drinking water and high levels of waterborne diseases. For ocean water, areas near industrial coasts can be dirty, but for overall drinking water quality, Bangladesh, Pakistan, and Democratic Republic of Congo often rank among worst due to lack of treatment infrastructure and natural arsenic and pollution. It is important to note water quality varies within countries, and rural areas often have worse access than cities.
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