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