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Dirty water is a consumable in Fallout 4.
Left out in the wasteland without protection from radiation, this carton of water provides 20 hit points, but at the cost of 7 rads. Dirty water is also a component of purified water, mirelurk egg omelette, iguana soup, squirrel stew, and vegetable soup, as well as the berserk and Lock Joint syringes.