The Moon was thought to be completely anhydrous until indigenous water was identified in
lunar samples in 2008. This discovery raised two fundamental questions about the Moon:
how much water is present in the bulk Moon and is water uniformly distributed in the
lunar interior?  I present the results of a petrologic study of KREEP-rich lunar rocks,
measurements of their water contents and deuterium (D) to hydrogen (H) ratios
(D/H). When viewed in the context of other lunar D/H studies, our results indicate there
are at least three distinctive reservoirs in the lunar interior, including an ultra-low
D reservoir that could represent a primitive component in the Moon¡Çs interior. The
origin of these diverse reservoirs likely reflects a combination of complex processes
during lunar formation and differentiation.