How to complete Source of the Contamination in ARC Raiders Source of the Contamination is one of the simplest quests in ARC Raiders, and you'll find out how to complete it here. To complete Source of the Contamination in ARC Raiders, you don’t need to do anything complicated, difficult, or go to high-threat areas where PvP is a near certainty. How to complete the Source of the Contamination quest in ARC RaidersSource: ShacknewsTo complete Source of the Contamination, you need to go near Water Treatment Control on Dam Battlegrounds and interact with a barrel in some filthy water. I would, however, highly recommend you bring the Dam Surveillance Key or at least take the time to loot Water Treatment Control. For much more on ARC Raiders, check out our dedicated game page.