Unsafe Water Sources
Global death rates attributable to unsafe water sources, country rankings, and trends from 1990 to 2023.
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This page presents age-standardized death rates attributable to unsafe water sources across 204 countries and territories, drawing on data from the IHME Global Burden of Disease Study 2024. Unsafe Water Sources mortality patterns vary considerably by geography, income level, and access to healthcare services. Understanding the epidemiology and population-level burden of unsafe water sources is critical for global public health policy, disease prevention strategies, and healthcare resource allocation.
The trend chart above shows how the global unsafe water sources rate has evolved since 1990, reflecting changes in risk factor prevalence, diagnostic capacity, treatment availability, and demographic transitions. Country rankings provide a comparative view of the current burden, highlighting disparities between high-income and low-income nations in unsafe water sources outcomes.
Unsafe water sources — encompassing microbiologically contaminated surface water, unprotected wells, and inadequately treated piped water — are a leading environmental risk factor for mortality, responsible for approximately 1.2 million deaths annually. The health burden operates primarily through waterborne enteric pathogens (cholera, typhoid, cryptosporidiosis, hepatitis A and E, poliomyelitis) that cause diarrheal disease, as well as through chemical contaminants including arsenic, fluoride, nitrates, and lead. Children under five bear a disproportionate burden, as repeated exposure to contaminated water drives a cycle of diarrhoea, malabsorption, malnutrition, and impaired immune function. Sub-Saharan Africa, South Asia, and parts of Southeast Asia have the lowest rates of safely managed drinking water services: as of 2022, an estimated 703 million people worldwide still lacked even a basic drinking water service, while 2.2 billion lacked safely managed water. Climate change compounds the crisis through drought-reduced water availability, flood-contaminated supplies, and saltwater intrusion into coastal aquifers. The economic burden is staggering — the World Bank estimates that inadequate water supply and sanitation cost developing economies up to 7% of GDP through healthcare costs and lost productivity.
Reducing mortality from unsafe water requires infrastructure investment (piped water treatment, protected wells, rainwater harvesting), household water treatment and safe storage (chlorination, filtration, solar disinfection), and source water protection through watershed management and pollution regulation. The UN Sustainable Development Goal 6 targets universal access to safely managed drinking water by 2030, requiring a fourfold increase in current rates of progress. Point-of-use water treatment has been shown to reduce diarrheal disease by 30-40% in communities without safe piped water.