A toilet protects health only if human waste is kept away from people at every step: in the toilet itself and when it is emptied, transported, treated or disposed of. In 2024, 3.4 billion people did not have such a safely managed service. Of these, 1.9 billion had a private improved toilet whose waste was not safely managed, 560 million shared a toilet with other households, 555 million used unimproved latrines, and 354 million had no toilet at all and practised open defecation. Hygiene is a separate gap: 1.7 billion people had no handwashing facility with soap and water at home. Even where homes are connected to sewers or septic tanks, much of the waste escapes. Only 56% of household wastewater worldwide was safely treated in 2024, and badly built or managed pits and septic tanks can pollute open drains and groundwater.
WHO attributes about 564,000 deaths in 2019, largely from diarrhoeal disease, to unsafe sanitation, and poor sanitation also spreads intestinal worms, schistosomiasis and trachoma and makes stunting worse. The burden falls hardest on low-income and fragile countries, rural areas and crowded informal settlements. Women and girls are affected in particular ways: without a safe, private toilet they face risks to their safety and dignity, and many do not have enough materials to manage menstruation as they would like. Schools are part of the gap: in 2025, 460 million school-age children had no basic sanitation service at their school, and 244 million of them attended a school with no sanitation service at all.