"Indeed, yes, we found water. And we didn't find just a little bit, we found a significant amount," said Anthony Colaprete, the mission's principal investigator at NASA's Ames Research Center.
The lunar impact kicked up at least 25 gallons of water and that's only what scientists can see, Colaprete said.
Having an abundance of water on the moon would make it easier to set up a base camp for astronauts by providing drinking water and an ingredient for rocket fuel.
The latest finding is further evidence that the moon is not the dry, barren place it appears and could reinvigorate scientific interest.
"This is not your father's moon," said Greg Delory of the University of California, Berkeley, who was not part of the research. "Rather than a dead and unchanging world, it could in fact be a very dynamic and interesting one."
Delory said the next focus should be to figure out where the water comes from and how much of it there is.
NASA's Lunar Crater Observation and Sensing Satellite, or LCROSS, last month slammed into one of moon's permanently shadowed craters near the south pole to study whether ice was buried underneath.
The mission actually involved two moon shots. First, an empty rocket hull slammed into the Cabeus crater. A shepherding spacecraft recorded the drama live before it also crashed into the same spot four minutes later.
Though scientists were overjoyed with the plethora of data beamed back to Earth, the mission was a public relations dud. Space enthusiasts who stayed up all night to watch the spectacle did not see the promised debris plume in the initial images.
NASA scientists had predicted the twin impacts would spew six miles of dust into space. Instead, images revealed just a mile-high plume.
Scientists spent a month analyzing data from the spacecraft's spectrometers, instruments that can detect strong signals of water molecules in the plume.
Previous spacecraft have detected the presence of hydrogen in lunar craters near the poles, which could be evidence of ice. In September, scientists reported finding tiny amounts of water mixed into the lunar soil all over the lunar surface.
"We've had hints that there is water. This was almost like tasting it," said Peter Schultz, professor of geological sciences at Brown University and a co-investigator on the LCROSS mission.
Mission scientists said it would take more time to tease out what else was kicked up in the moon dust.
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