Europa, one of Jupiter's moons, has a water-ice crust.
Ken, this amplifies (and does not contradict) your statement but seems maybe a little more optimistic?Sounds like Europa has a shortage of every essential resource required for a colony except water.
Back to the gushers for the first point and nods of agreement (at least in the short to medium term) for the second. CatMJ - sorry, I was thinking inhabitable, as in somewhere people might be able to live rather than inhabitable as in non-terrestrial life might live there. Looking for evidence of life is very good reason to look closer at Europa but it does not look suited to colonisation.