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Water Shortage Issue Related to the Mexican Water Deficit

Documents and information pertaining to the TCEQ's position on Rio Grande water distribution between the United States and Mexico.


The failure of Mexico to consistently deliver water in accordance with the 1944 water treaty between the United States and Mexico significantly harms Texas interests.

The treaty requires delivery from certain tributaries in Mexico to the United States of not less than a minimum annual average of 350,000 acre feet, in cycles of five consecutive years. Mexico’s failure to deliver the amount of water owed results in undue hardship for Texas' water users who rely on that water for irrigation, as well as municipalities that need the irrigation water to convey public drinking water supplies. In fact, a 2013 study by Texas A&M AgriLife concluded that a loss of irrigation water in the Lower Rio Grande Valley of Texas endangers approximately 4,840 jobs per year and reduces output in the valley by an estimated $395 million.

Despite countless meetings between U.S., Texas, and Mexico water officials, Mexico has yet to provide a concrete proposal and further productive and earnest discussions and commitment to honor the Treaty and deliver the minimum annual amount of water. To resolve this issue, Mexico must recognize their obligation to the United States under the 1944 Treaty, set aside water for Treaty compliance, and deliver water on a schedule that benefits all users within the Rio Grande Basin. The United States has never failed to meets its obligation on the Colorado to deliver 1.5 million acre-feet to Mexico under the same Treaty. Texas is simply requesting that Mexico treat its obligation to the Rio Grande in the same manner.

The International Boundary and Water Commission, in conjunction with the U.S. State Department, has the responsibility to enforce the treaty, but has not been successful. The U.S. Department of State has not engaged in the discussions in a manner similar to that required in 2005 to solve the then established debt. Until the federal government engages in a more serious manner, it is expected that Mexico will continue to disregard the Treaty in spite of the fact that the United States has implemented actions to the benefit of Mexico on numerous occasions.

Rio Grande Watermaster Reports

Reservoir Levels

This report is for the week ending 11/1/2014.

  • The current cycle began on October 25, 2010.
  • The pro-rated deficit as of 11/1/2014 is 275,159 AF for this cycle, which is a decrease from the 308,704 reported in the 10/25/2014 report.
  • During the first year of the cycle, Mexico delivered 288,309 AF, during the second year 100,401 AF, during the third year 392,142 AF, during the fourth year 310,444, and to date 40,257 AF for the fifth year.
  • The running total of deliveries for this 5-year cycle is 1,131,553 AF.
  • On November 1, 2014, the U.S. combined ownership at Amistad/Falcon stood at 44.29 percent of normal conservation capacity, impounding 1,502,246 acre-feet, up from 41.35 percent (1,402,528 AF) of normal conservation a year ago at this time.
  • As of 11/1/14, the United States has 1,108,241 AF in Amistad and 394,005 AF in Falcon.
  • Mexico has 520,476 AF in Amistad and 374,548 AF in Falcon.
  • The Amistad Reservoir is currently at: 1086.12 ft -30.88 with a release of 20.0 cms / 706 cfs
  • Falcon Reservoir is currently at: 270.50 ft -30.70 with a release of 3.0 cms / 106 cfs

Ownership of Water – Amistad/Falcon

Report dated 11/15/2014.

On November 15, 2014, the U.S. combined ownership at Amistad/Falcon stood at 45.72% of normal conservation capacity, impounding 1,550,888 acre-feet, up from 41.54% (1,409,014 AF) of normal conservation a year ago at this time. Overall the system is holding 41.97 % of normal conservation capacity, impounding 2,485,637 acre-feet with Amistad at 51.33% of conservation capacity, impounding 1,681,413 acre-feet and Falcon at 30.38% of conservation capacity, impounding 804,224 acre-feet. Mexico has 36.94% of normal conservation capacity, impounding 934,749 acre-feet at Amistad/Falcon.


Letters Pertaining to Mexican Water Deficit

IBWC's Minute 309 and Letters