1. All iron and steel items used in the project must be produced in the United States. This means all manufacturing processes, from the initial melting stage through the application of coatings, occurred in the United States.

2. All manufactured products used in projects must be produced in the United States. For a manufactured product to be considered produced in the United States, the cost of the components of the manufactured product that are mined, produced, or manufactured in the United States must be greater than 55% of the total cost of all components of the manufactured product, unless another standard for determining the minimum amount of domestic content of the manufactured product has been established under applicable law or regulation.

3.  All construction materials used in projects must be manufactured in the United States. This means all manufacturing processes for the construction material occurred in the United States.

*In January 2025, EPA issued a waiver for projects involving solar panels, which mandates solar panels be assembled (not manufactured) in the U.S. This waiver extends to solar panels purchased through December 2025, so long as those solar panels are installed before July 2026.