Bangladesh is a country of rivers and floods but groundwater is still a vital resource because it provides bacterially safe water and helps produce food for millions of people. In rural and urban areas almost the entire population rely on groundwater for potable water. In the early 1990s some 97% of the population used it for drinking, but this has now come down to about 80% due to the detection of arsenic in shallow groundwater. Use of groundwater in irrigation is increasing every year, and now more than 74% of the irrigated area is covered with groundwater. The country's industries also rely on groundwater for most of their water needs. Though Bangladesh has abundant rain and surface waters, these sources are not available when water demand is the most. Therefore, groundwater can be considered as the country's most important natural resource for ensuring public health and food security. Consider the options for groundwater contamination in Bangladesh and give recommendations for prevention and conservation of groundwater in Bangladesh.