Arsenic is a ubiquitous naturally occurring chemical element, and the 20th most common element on Earth. Arsenic levels in the groundwater vary from around 0.5 parts per billion to 5000 parts per billion, depending on an area's geologic features, and possible presence on industrial waste. The highest groundwater arsenic levels have been recorded in Brazil, Cambodia, Afghanistan, Australia, and Bangladesh.
Arsenic is a ubiquitous naturally occurring chemical element, an,d the 20th most common element on Earth. Arsenic levels in the groundwater vary from around 0.5 parts per billion ,to 5000 parts per billion, depending on an area's geologic features and possible presence on industrial waste The highest groundwater arsenic levels have been recorded in Brazil, Cambodia Afghanistan, Australia, and Bangla.desh.