The Davis-Bacon  Act requires Federal agencies to pay workers under  contract to them the “prevailing wage” based on the local union wage scale  defined by the U.S. Department of Labor. Generally, the provisions of the  Davis-Bacon Act do not apply to State or local contracts for work completed  using public assistance funds under the Stafford Act. However, the provisions  may apply to contracts let by other Federal agencies, such as the U.S. Army  Corps of Engineers. If a State or local government incorporates prevailing  wage rates of the U.S. Department of Labor as part of its normal practice for  all contracts, regardless of funding source, then those rates would be  eligible.
   References:   44 CFR §13.36(i)5
   Public Assistance Guide, FEMA 322, page 44