A source of arsenic pollution in groundwater is

Arsenic in groundwater comes mainly from natural deep geological formations that release it into aquifers.

Industrial effluents can carry many toxins but are not the chief source of this widespread arsenic.

Dyeing industries pollute water with dyes and chemicals rather than being the main arsenic source.

Agricultural wastes add nutrients and pesticides but are not the primary arsenic pathway here.

Weathering of arsenic bearing rocks and sediments feeds the dissolved arsenic underground.

Large parts of the Bengal delta suffer natural arsenic contamination from such formations.