CHICAGO — Moody's Investors Service last week downgraded its rating on Cook County Forest Preserve to A1 from Aa2, driven by the district's mounting pension liabilities.

The county forest district is the latest Illinois local government to take a ratings hit due to pension problems, which are tied to the General Assembly's "legislative paralysis" on enacting pension reforms, Moody's said. The ratings agency has recently lowered its ratings on Chicago, Cook County itself, and the Chicago Park District.

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