Well Water Arsenic Mitigation in Bangladesh: Benefits Outweighing Risks of Sharing Private Environmental Data.

This paper argues that environmental data should be collected and shared more widely to benefit public health while maintaining privacy, using Bangladesh's well water arsenic crisis as a case study. Arsenic of natural origin in well water causes about 5% of adult deaths in Bangladesh, but a recent study shows that mortality returns to background levels within a decade after exposure ends. This finding motivates comparing the Bangladesh government's testing of millions of wells for arsenic in 2000-2005 and again in 2021-2023. Despite progress, the data reveal that 20 million Bangladeshis still consume unsafe water today, largely due to a lack of information and suboptimal interventions. We propose reviving arsenic mitigation through public sharing of anonymized test data via a web application combined with a solution-focused national media campaign to encourage targeted installation of safe wells. The Bangladesh arsenic crisis illustrates how a wider distribution of private but anonymized environmental data could serve public health across other domains by raising awareness and enabling more effective individual and governmental responses.