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Updated: Apr 18, 2026

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
Published on: June 28, 2019
An information intervention in India reduces consumption of arsenic-contaminated drinking water and has small effects
Shambhavi Priyam1, Daniel Salicath2, Matthias Sutter3,4,5
1The World Bank, Washington, DC 20433, USA.
Abstract:
Contamination of drinking water with toxic arsenic affects more than 170 million people worldwide. Because arsenic is tasteless, colorless, and odorless when mixed with water, almost all people consume it unknowingly and suffer from health impairments (like skin-related diseases or cancer). Running a randomized controlled trial with 2,334 Indian households, we show that providing inexpensive information on how to reduce exposure to arsenic contamination in drinking water has significant effects even 1 year after the intervention. First, it generates knowledge about arsenic's harmful effects. Second, it improves drinking water treatment practices. Third, treated households are between 2.7 and 9.3 percentage points more likely to consume safe drinking water. We also find suggestive evidence for improvements with respect to stomach-related health issues. With costs of <2 euros per disability-adjusted life year averted, our intervention is very cost-effective.
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