Linked from
The 7 pages that link to Groundwater arsenic contamination, each with the reason it gives.
ArsenicRelated: Natural release from aquifers is a major route of chronic exposure worldwide.
ArsenateNarrower topic: Arsenate is a major dissolved form of arsenic in oxygen-rich groundwater.
Arsenic acidRelated: Arsenate formed from arsenic acid can occur in oxygen-rich groundwater.
ArsenopyriteRelated: Weathering of arsenopyrite-bearing rocks can add arsenic to groundwater.