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Anoxic waters are bodies or areas of sea water, fresh water or groundwater that are depleted of dissolved oxygen. Anoxic waters can be contrasted with hypoxic waters, which are low but not completely lacking in dissolved oxygen, often defined as having oxygen concentration less than 2 milligrams per litre. This condition is generally found in areas that have water stagnation and/or dead stratification. The United States Geological Survey defines anoxic groundwater as that with a dissolved oxygen concentration of less than 0.5 milligrams per litre.
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