This study aims to assess the level of awareness of Hanoi residents who are dependent on groundwater regarding arsenic contamination. This study also aims to provide solutions and recommendations as well as to enhance residents'' knowledge of arsenic contamination. In-depth interviews were used to determine general information in the studied area. A household questionnaire interview was used to assess a respondent''s knowledge regarding fundamental concerns about the arsenic contamination problem. Three communes with low, medium and high arsenic levels in the groundwater were selected.The findings could be useful for the government in preventing and mitigating arsenic poisoning in specific high arsenic risk areas and in groups such as women, farmers, laborers and those with a low education.