OK, so only around 46ppm, and in little bits of volcanic glass, but hey, water! On the Moon!

It looks like there used to be a lot more, but it probably all vaporized long ago, unless…

Since the Moon’s gravity is too feeble to retain an atmosphere, the researchers speculate that some of the water vapor from the eruptions was probably forced into space, but some may also have drifted toward the cold poles of the Moon where ice may be present in permanently shadowed craters. Several previous lunar missions have suggested the presence of ice at both poles.

So now maybe someone will go and look for it.