The serious delinquency rate on Freddie Mac guaranteed single-family loans broke the 3% mark in August, the highest reading ever posted by the mortgage giant.

In its new monthly summary, the GSE said the percentage of loans 90 days or more past due and in foreclosure hit 3.13% during the month, up 18 basis points from July. In August 2008, the government sponsored enterprise had a 1.11% serious delinquency rate.

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