An estimated 140 million people drink water above the arsenic limit
WHO estimates 140 million people in at least 70 countries drink water with arsenic above the 10 µg/L guideline. A global model puts those at risk at 94–220 million.
How this affects people
Arsenic occurs naturally in groundwater, which WHO calls the greatest threat to public health from arsenic. Long-term exposure is linked to skin lesions, cancers, heart disease, diabetes and impaired child development.
WHO says there is no reliable estimate of the problem worldwide. The 140 million figure counts people already exposed, while the 94–220 million model counts people potentially affected, so the two are not directly comparable.
Look at what keeps the problem going
- 01Naturally occurring arsenic in groundwater
- 02Reliance on shallow wells and untreated groundwater
- 03Contamination in countries including Bangladesh, India, China and Chile
- 04Arsenic entering food through crops such as rice irrigated with contaminated water
What could happen next
The future leaves room for choices. Compare the outlooks, check what supports them and notice where the evidence becomes less certain
The true scale is unmeasured
WHO says there is no reliable estimate of the magnitude of the problem worldwide.
The future is not a timetable. These summaries reflect published scenarios and trends, with deeper uncertainty at longer horizons. Choices made now matter.
Where could a useful response begin?
Begin with a question you can investigate. Compare the sources and follow related briefings to see how the problem connects to other lives and places. This prototype does not accept proposals yet.
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