Texas Agricultural Producers Assistance Act This bill directs the Department of Agriculture (USDA) to submit a report to Congress on USDA assistance available for agricultural producers in Texas related to Mexico's non-compliance with a 1944 treaty with the United States concerning water utilization. Specifically, the USDA report must list all of the existing USDA authorities and programs that are or could be made available to provide assistance to agricultural producers in Texas that have suffered economic losses due to Mexico not delivering water to the United States in accordance with the Treaty on Utilization of Waters of the Colorado and Tijuana Rivers and of the Rio Grande, including the Supplementary Protocol.