Fertilizer Stewardship, Utilization, Sustainability, Technology, Access, Innovation, and Nourishment Act or the Fertilizer SUSTAIN Act This bill (1) directs the Department of the Interior to designate potash and phosphates as critical minerals, (2) revises the Federal Register and National Environmental Policy Act permitting process for mining and phosphate and potash exploration, and (3) requires the Environmental Protection Agency to allow phosphogypsum to be used in government road projects.