Rank #17 ITN Score: 22/30

Clean Water & Sanitation

2.2 billion people lack access to safely managed drinking water, and 3.5 billion lack safe sanitation. Contaminated water and poor sanitation cause 1.4 million preventable deaths annually, primarily from diarrheal disease in young children.

Key Statistic

Every $1 invested in water and sanitation infrastructure yields $4–$12 in economic returns, per WHO.

ITN Assessment

Importance8/10

Scale & severity

Tractability8/10

Ease of progress

Neglectedness6/10

Lack of attention

0 followers

Why This Matters

High importance given mortality and disability burden; interventions like water purification, handwashing promotion, and WASH infrastructure are proven and cost-effective; neglected especially in rural Sub-Saharan Africa.

Key Organizations

Evidence Action (Safe Water)
Chlorine dispensers at community water points, protecting millions at $1-2/person/year.
Water.org
Provides financial access to water and sanitation solutions for low-income households.
UNICEF WASH
Delivers WASH programs in humanitarian and development settings globally.
IRC WASH
Research and capacity-building for sustainable WASH services.
WHO Water, Sanitation and Health
Global norms, guidelines, and monitoring for WASH outcomes.

Submit New Draft

1 approved

Sort

Safe Water for All: The Case for Prioritizing WASH Interventionsv1Accepted

WorldProblems Solved

2.2 billion people lack access to safely managed drinking water, and 3.5 billion lack safe sanitation. Contaminated water and inadequate sanitation kill 1.4 million people annually — overwhelmingly children — through diarrheal disease and related infections. This founding report evaluates the scale of the global WASH crisis, examines why it persists despite highly cost-effective solutions, and makes the case for WASH as a top-priority development intervention.

+0 votes

Followers

Approved Docs

Evidence & References

80,000 Hours Problem Profile

https://80000hours.org/problem-profiles/

Problem Profile

Why Pressing

2.2 billion people lack access to safely managed drinking water, and diarrheal disease — 88% of which is attributable to inadequate WASH — kills 1.4 million people annually, 90% of them children under five. This is a solvable problem: water purification interventions like chlorination cost as little as $1–$2 per person per year, making WASH among the most cost-effective development investments available. Evidence Action's dispensers-for-safe-water program is rated by GiveWell as a top charity. Yet the global WASH financing gap is $54 billion per year, and the Sustainable Development Goal to achieve universal clean water by 2030 is badly off-track. The case for dramatically scaling WASH investment is clear, evidence-backed, and undeniably urgent.

Scale

703 million people lack basic water services; 1.7 billion lack basic sanitation; 2.3 billion lack basic handwashing facilities. Sub-Saharan Africa has the highest rates of unimproved access, while South Asia carries the largest absolute numbers without sanitation. WASH-related diseases cause 1.4 million deaths annually. Beyond mortality, waterborne illness produces enormous disability: diarrhea hospitalizations, stunting from repeated intestinal infections in children, and school absenteeism that impairs learning.

Neglectedness

Global WASH funding is approximately $60 billion per year — roughly half the estimated requirement. Most funding comes from governments with weak accountability for access outcomes. Philanthropic WASH funding with rigorous measurement is a small fraction of this. The most cost-effective urban water access interventions — chlorination dispensers at community water points — receive under $50 million globally per year despite achieving verified impact at under $2 per person protected.

Tractability

WASH is highly tractable. Chlorination of water reduces diarrhea incidence by 25–40% in field conditions. Evidence Action's safe water program delivers this at approximately $1–2 per person per year, with GiveWell rating it among the top 10 most cost-effective charities globally. Community-Led Total Sanitation programs have achieved open-defecation-free status in thousands of villages across Africa and Asia. School WASH improvements simultaneously deliver health, attendance, and gender equity benefits. The primary constraint is funding, not technical knowledge.