This document discusses whether water should be considered a security issue according to realist theory in international relations. It argues that water meets the criteria of a security issue given its vital importance to human life and the potential for conflicts over scarce water resources. While realism traditionally focused narrowly on military threats to states, the failure of realists to predict major global changes like the end of the Cold War suggests the theory needs to be more flexible and adaptive to contemporary security challenges like environmental stress and resource scarcity. Including water as a security issue could make realism more relevant and effective in analyzing current global politics.