JPMorgan Chase and Co. is helping one in five troubled homeowners eligible for a government-sponsored housing rescue, while Wells Fargo & Co. is reaching 6 percent of eligible borrowers, and Bank of America Corp. is aiding 4 percent, the Treasury Department said Tuesday.

"The data show that servicer performance has been uneven," the Treasury said in a statement. "The administration has asked servicers to ramp up implementation."

In February, President Barack Obama unveiled a housing rescue plan intended to lower monthly mortgage costs for struggling borrowers.

Last week, the Treasury Department and Department of Housing and Urban Development asked 25 mortgage servicers to expand their help.

Bank of America, which has taken $45 billion in taxpayer aid, is ranked 11th among servicers helping troubled borrowers.