π§
Unsafe Water & Sanitation
Roughly 2 billion people lack safely managed drinking water
β Improving
π©Ί Health
π§ Understand
The trend
Access keeps expanding decade over decade, but population growth and infrastructure decay mean the last quarter of humanity is the hardest to reach.
The scale
On the order of 2 billion people drink water contaminated or at risk of contamination; ~3.5 billion lack safely managed sanitation. Diarrheal disease β largely water-borne β kills roughly 1 million people a year, heavily children.
Root causes
Missing or broken infrastructure, poverty, weak maintenance systems (a huge share of installed rural water points fall into disrepair), and open defecation where sanitation is absent.
Who suffers most
Rural Sub-Saharan Africa and South Asia; women and girls, who do most water hauling and lose hours daily; children, who die of the resulting disease.
Common misconception
"Digging wells solves it." Hardware without maintenance fails within years β the unglamorous work of chlorination, spare parts and fee systems is where impact lives.
β‘ What actually works
Water chlorination
Strong evidence
Dilute chlorine at the point of collection or in supplies β kills the pathogens that kill children.
Cost & effect: On the order of $1β2 per person per year; recent large studies suggest child mortality reductions rivaling the best health interventions.
Community sanitation programs
Promising
Ending open defecation through community-led behavior change plus affordable latrines.
Cost & effect: Tens of dollars per household; effects strongest when whole communities shift together.
Handwashing promotion
Promising
Soap and behavior campaigns.
Cost & effect: Cheap; real but hard-to-sustain behavior effects.
π§ Act
πΆ With your money
Fund chlorination and safe-water org types β a quietly top-tier use of a donation.
See what a monthly gift does via the "What Would $X Do?" tool.
β° With your time
Join river/beach cleanups locally; water stewardship starts where you live.
π οΈ With your skills
Engineers and hydrologists: field org types actively seek technical volunteers for system design and maintenance programs.
π£ With your voice
Talk about maintenance, not just wells β better public understanding shifts funding to what lasts.
π£ Share this
β Questions people ask
How can I help with unsafe water & sanitation?
There's a concrete step for whatever you can offer. With your money, fund chlorination and safe-water org types β a quietly top-tier use of a donation. With your time, join river/beach cleanups locally; water stewardship starts where you live. With your skills, engineers and hydrologists: field org types actively seek technical volunteers for system design and maintenance programs. With your voice, talk about maintenance, not just wells β better public understanding shifts funding to what lasts.
What is the most effective way to reduce unsafe water & sanitation?
The approaches with the strongest evidence: Water chlorination: Dilute chlorine at the point of collection or in supplies β kills the pathogens that kill children. On the order of $1β2 per person per year; recent large studies suggest child mortality reductions rivaling the best health interventions. Community sanitation programs: Ending open defecation through community-led behavior change plus affordable latrines. Tens of dollars per household; effects strongest when whole communities shift together.
Where should I donate to help with unsafe water & sanitation?
Impact Compass doesn't name individual charities. The higher-leverage path is to back the interventions that work best here (Water chlorination, Community sanitation programs) and to choose organizations by how transparently they deliver them. Compare organization types for this cause with the free tools linked above, or give useful items directly through Givelink.
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Rough figures for context, drawing on: WHO/UNICEF JMP Β· Our World in Data Β· GiveWell. Approximations, not citations. Last reviewed 2026-07-16.
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