More borrowers with good credit are defaulting on their home loans, and that’s going to make it even harder for the staggering housing market to recover.

Les Christie / CNNMoney.com

Prime mortgages are starting to default at disturbingly high rates – a development that threatens to slow any potential housing recovery.

The delinquency rate for prime mortgages worth less than $417,000 was 2.44% in May, compared with 1.38% a year earlier, according to LoanPerformance, a unit of First American (FAF, Fortune 500) CoreLogic that compiles and analyzes residential mortgage statistics.

Delinquencies jumped even more for prime loans of more than $417,000, so-called jumbo loans. They rose to 4.03% of outstanding loans in May, compared with 1.11% a year earlier.

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Bob Ivry / Bloomberg.com

Almost one-third of U.S. homeowners who bought in the last five years now owe more on their mortgages than their properties are worth, according to Zillow.com, an Internet provider of home valuations.

Second-quarter home prices fell 9.9 percent from a year earlier, giving 29 percent of owners negative equity, said Zillow, the Seattle-based service that offers values for more than 80 million homes. For those who bought at the 2006 peak of the housing market, 45 percent are now underwater, Zillow said.

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