Safe water is a human right, but billions of people still don’t have access to it.
What if the only water you had to drink was contaminated?
That’s the reality for over 2 billion people. Without reliable access to safe water, their only option is to drink water that’s contaminated — and sometimes deadly, especially for children under five.
Contaminated water causes malnutrition and diseases like typhoid, cholera, and hepatitis A. It’s also the most common cause of diarrhea, which is the second-leading cause of death in children under five years old. As climate change continues to impact our planet, deadly waterborne diseases like these are on the rise.
While unsafe water may be collected from rivers and ponds, some of it comes out of the wells and taps built by governments and NGOs. Most water programs focus on building infrastructure, but the truth is: that’s simply not enough to save lives. Untreated water, even from an improved source, can be just as dangerous. It's a global water crisis.
World Water Day 2026
Where Water Flows, Equality Grows
This year's World Water Day highlights what the data — and our work — make clear: the water crisis falls hardest on women and girls. Women and girls spend an estimated 250 million hours every day collecting water. In 7 out of 10 households without running water, it's girls who carry the load.
These numbers describe a burden that falls on women at every stage — from the journey to the water source, to the treatment at home, to the caregiving when unsafe water makes a family member sick.
Evidence Action's Safe Water Now program addresses this directly. A randomized controlled trial conducted with J-PAL in Odisha, India found that not only did in-line chlorination reduce E. coli in household tap water by 70% – it also reduced the time women spent treating water, shifting a daily burden that falls disproportionately on them.
And across Kenya, Uganda, and India, women aren't just benefiting from safe water — they're delivering it. Meet the engineers, technicians, and operators behind the program in our International Women's Day feature →
When water treatment works, it can reduce child mortality by around 20%. Your support helps bring that evidence to scale.
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Water treatment is an effective, low-cost, and scalable solution.
Until recently, the impact of safe water on child survival has been difficult to quantify. And without experimental evidence, water treatment has generally not been included in the child survival interventions recommended by the WHO, World Bank, and UNICEF. Consequently, global health funding has not been deployed to support safe water programming — leaving a significant gap in addressing a root cause of child mortality.
But now, groundbreaking research by Nobel Laureate Michael Kremer and colleagues shows us that water treatment can reduce under-five child mortality from all causes by around 20%. Their study also found that it’s highly cost-effective, potentially saving a child’s life for just $3,000 or adding a year of healthy life for only $40.
We provide access to clean water to millions of people by scaling cost-effective water treatment interventions.
Our approach to treatment is centered on chlorination, a WHO-endorsed solution that’s proven to be highly effective at killing pathogens. Working closely with local communities and governments, we install and maintain long-lasting chlorination devices that make water safe to drink for communities and families.
Invest in the most urgent safe water opportunities, improving the health of children and communities.
We’re expanding and scaling water treatment interventions that we know work, and continuing to test complementary ones that can reach even more people.