In a sharp escalation of tensions over water access, Donald Trump announced Monday that the United States would impose a 5% tariff on all Mexican imports unless Mexico immediately releases 200,000 acre-feet of water to the U.S., as required under the 1944 Water Treaty. Trump accused Mexico of falling behind on its obligations to deliver water through the Rio Grande system, leaving U.S. producers - particularly in South Texas - struggling with reduced irrigation for row crops and livestock operations.

The treaty, signed over 80 years ago, mandates that Mexico deliver 1.75 million acre-feet of water every five years to the U.S., via a network of dams and reservoirs feeding into the Rio Grande. Trump claimed in a social media post that Mexico now owes the U.S. 800,000 acre-feet of water, and warned that if the initial release is not made by December 31, further economic actions would follow.

"As of now, Mexico is not responding, and it is very unfair to our U.S. farmers who deserve this much-needed water," Trump said. "That is why I have authorized documentation to impose a 5% Tariff on Mexico if this water isn't released, IMMEDIATELY."

Falcon Lake, one of the key reservoirs on the Rio Grande, has seen water levels drop dramatically, contributing to irrigation restrictions across Zapata, Starr, and Hidalgo counties in Texas. These are core production areas for cotton, sorghum, vegetables, and cattle.

Mexico has cited its own severe drought conditions as a reason for falling behind on its water delivery obligations. The country's National Water Commission (CONAGUA) has reported below-average rainfall across northern Mexico, severely limiting reservoir reserves. In April, U.S. Agriculture Secretary Brooke Rollins stated that Mexico had agreed to increase its water releases to help offset the shortfall, but the U.S. now argues that compliance has stalled.

The tariff threat comes at a time of broader trade uncertainty, with agricultural stakeholders watching closely for signs of disruption to the U.S.-Mexico ag supply chain. Mexico remains one of the top trading partners for U.S. ag exports, including corn, soybeans, beef, and dairy. A tariff could raise prices, destabilize bilateral relations, and create new input cost pressures for farmers already facing volatile markets and climate stress.

The dispute also reopens questions about how the 1944 treaty is enforced and whether its mechanisms are adequate to address today's extreme weather and growing water demands. For producers along the Rio Grande basin, where irrigation is essential, any interruption in flow can spell disaster during the peak growing season.

As of publication, Mexico's economy ministry had not responded publicly to Trump's statements. U.S. officials are urging producers in the region to document crop losses and prepare for potential federal assistance, should conditions worsen.