Arsenic contamination of groundwater is a significant problem in Bangladesh that was first detected in 1993. Arsenic exists naturally in the bedrock and has leached into shallow aquifers used for drinking water. Long term exposure can cause arsenicosis, a condition with skin lesions and other health issues. Over 40,000 people have shown symptoms and 100,000 are estimated to have skin lesions. Actions taken include identifying contaminated wells, providing alternative sources like deep wells and filters, and raising awareness. While awareness has increased, social stigma remains for those afflicted and arsenic may also contaminate food crops irrigated with contaminated water. Preventing groundwater pollution and using alternative sources are keys to addressing this problem.