Co-occurrence of arsenic and fluoride in groundwater of semi-arid regions in Latin America: Genesis, mobility and remediation

► As and F co-occurrence in groundwater is linked to volcanism, geothermal, and mining activities. ► As and F co-occurrence are particularly pronounced in arid and semi-arid regions. ► As and F are generally associated to high concentrations of Na+ and HCO3−. ► Technology is required to simultaneously remove As and F from drinking water.