More bad news on the housing bust front: Nearly 25% of all mortgage borrowers were underwater, meaning they owe more on their loans than their homes are worth.

First American CoreLogic, the research firm that monitors housing equity, reported Tuesday that 11.3 million homeowners — or 24% of all homes with mortgages — were underwater as of the end of 2009. That’s up from 23% and 10.7 million borrowers three month earlier.

Nevada was the state with the worst record at 70% of all mortgaged properties underwater. That was followed by Arizona (51%), Florida (48%), Michigan (39%) and California (35%).

For many homeowners, being underwater, also know as negative equity, has few consequences. If they’re not planning to sell and can afford their monthly bills, they can wait out the downturn.

(READ MORE: http://money.cnn.com/)