What kind of aircraft was it? Yes, it can be a hazard. I have experienced water dripping from overhead panels, it indicates water condensation caused by improper air circulation. Water in the wrong places can cause problems when it encounters electrical circuts.
Sometimes, if there is a water leak down lower in the ship, it will accumulate in the very bottom of the hull below the cargo compartment. When the aircraft is at cruise altitude, it will then freeze. Now that it has become ice, it will stay in this state for a long time, and can cause center-of-gravity problems for the pilot. Water (or ice) is quite heavy.