WASH stands for Water, Sanitation, and Hygiene. It’s a public health framework used by the World Health Organization (WHO), UNICEF, and the CDC to describe the basic services people need to stay healthy and prevent infectious disease. The term covers everything from access to clean drinking water to functioning toilets to handwashing with soap.
The Three Parts of WASH
Water refers to access to safe drinking water from sources designed to protect against contamination. These include piped water, boreholes, protected wells, and packaged or delivered water. When water sources aren’t protected, harmful germs, parasites, and toxic chemicals from human waste, animal waste, pesticides, or industrial runoff can contaminate the supply.
Sanitation means having toilets or latrines that hygienically separate human waste from contact with people. Acceptable facilities range from flush toilets to ventilated pit latrines and composting toilets, as long as they have a proper slab or platform. The goal is simple: keep fecal matter out of water sources, soil, and food.
Hygiene centers on handwashing with soap and water, the single most effective way to break the chain of disease transmission. A handwashing facility can be anything from a sink with tap water to a bucket with a tap or a tippy-tap (a foot-operated jug). Soap means bar soap, liquid soap, or powder detergent. Ash, soil, and sand don’t count.
Why WASH Matters for Global Health
Poor water, sanitation, and hygiene conditions fuel diseases that are otherwise entirely preventable. Cholera, typhoid fever, polio, and diarrheal illnesses all spread through contaminated water or inadequate hygiene. Neglected tropical diseases like schistosomiasis, trachoma, and Guinea worm disease are harder to control without clean water and proper sanitation infrastructure.
The numbers are staggering. In 2019, an estimated 1.4 million deaths could have been prevented with safe WASH services. Over one million of those were from diarrhea alone, while roughly 356,000 people died from acute respiratory infections linked to unsafe hand hygiene practices. These deaths disproportionately affect children in low-income countries.
How Many People Still Lack Access
As of 2024, about 1 in 4 people globally, roughly 2.1 billion, still lack access to safely managed drinking water. That includes 106 million people who drink directly from untreated rivers, lakes, or ponds. On the sanitation side, 3.4 billion people lack safely managed sanitation services, and 354 million still practice open defecation. Another 1.7 billion people don’t have a handwashing facility with soap and water at home.
Progress is happening, though. About 74% of the world’s population used safely managed drinking water in 2024, up from lower baselines at the start of tracking. But the pace isn’t fast enough to meet the targets set under the United Nations’ Sustainable Development Goal 6, which calls for universal access to safe water and sanitation by 2030.
WASH in Schools and Health Facilities
The framework isn’t just about households. International monitoring programs track WASH services in schools and healthcare facilities, where gaps can be especially dangerous. For a school to qualify as having “basic” water service, it needs an improved drinking water source with water actually available at the time of inspection. Basic sanitation means improved, functional toilets. Basic hygiene means a handwashing station with soap.
More recent WASH programs also integrate menstrual health, recognizing that girls and women need gender-separated facilities with door locks, lighting, disposal bins for menstrual products, and reliable water and soap. Projects in countries like Ghana, Mozambique, and Eswatini now build these features into school and public sanitation facilities as standard design, along with accessibility for people with disabilities.
The Economic Case for WASH Investment
Beyond the health benefits, investing in WASH infrastructure pays for itself. A UN analysis found that every dollar spent on water and sanitation returns $4.30 in reduced healthcare costs for individuals and communities. At a global scale, adequate WASH services would contribute an estimated 1.5% gain in global GDP, driven largely by fewer sick days, lower medical expenses, and more productive populations.
That return comes from a straightforward chain: when people have clean water, working toilets, and soap, they get sick less often. Children miss fewer school days. Adults miss less work. Families spend less on treating preventable illnesses. The investment is in pipes, wells, latrines, and soap. The payoff is healthier communities that can focus their time and money on something other than surviving waterborne disease.