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\section{H_2O Megamasers}  \label{sec:h2o_mm}  Multiple H$_2$O transitions have been observed producing maser emission in galactic source \citep{Elitzur_1992}, however the dominant transition detected as stimulated emission is the 22 GHz transition (see Table \ref{tab:maser_props}). This transition is   The 22 GHz H$_2$O maser emission is associated withe circumstellar material around late-type stars, and with molecular outflows due to young, embedded stars. These environments suggest a collisional pumping mechanism. Mega-maser emission  \subsection{Extragalactic versus Galactic Properties}  \label{sub:h2o_props}