Mexico has delivered less than 1% of the water it owes to the US as border dams run low

Mexico’s struggle to meet its water‑delivery obligations to the United States has become a daily conversation in the border towns of Coahuila and Tamaulipas, where farmers, pescadores and families watch the water levels in La Amistad and Falcon dams dip below the 30 percent mark. The latest figures released by the International Boundary and Water Commission (IBWC) reveal that, as of October 24, 2026, Mexico has delivered only 3,159 acre‑feet of the 865,139 acre‑feet it owes from the 2020‑2025 deficit. That translates to less than one percent of the debt—an amount that, while numerically small, carries a weighty impact on the lives of those who depend on the Río Bravo for irrigation, livestock and household use.

Historical backdrop of the 1944 water treaty

The 1944 water treaty between Mexico and the United States established a binational framework for sharing the waters of the Río Bravo (known as the Rio Grande in the United States) and the Colorado River. Under the treaty, Mexico is required to deliver a minimum of 350,000 acre‑feet of water each year to the United States. This commitment was designed to secure a reliable flow for agricultural communities on both sides of the border and to support the growing urban demands of border cities such as El Paso and Ciudad Juárez.

Over the decades, the treaty has been the backbone of water diplomacy, but it was never intended to address the severe droughts and climate‑driven variability that have become common in the Southwest. As the river’s flow contracts, the fixed annual quota strains both nations, especially when reservoirs like La Amistad and Falcon sit at historically low levels.

The 2020‑2025 deficit and its lingering shadow

During the five‑year cycle that ran from October 25, 2020, to October 24, 2025, Mexico delivered 884,861 acre‑feet, falling short of the treaty‑mandated 1,250,000 acre‑feet. The shortfall left a deficit of 865,139 acre‑feet that Mexico now owes the United States. According to the U.S. section of the IBWC, the country has until 2030 to repay that balance, while simultaneously meeting its annual obligation of 350,000 acre‑feet for the 2025‑2030 period, which will total 1,750,000 acre‑feet over the five years.

To put the numbers in perspective, the 3,159 acre‑feet delivered by October 24, 2026, represent roughly 0.36 percent of the total deficit. While the percentage sounds minuscule, each acre‑foot equals about 325,851 gallons—enough water to fill more than 2,000 standard swimming pools. For the campesinos in the ejido of San Juan de los Lagos, that shortfall means less water for their corn fields, and for the tianguis vendors in the colonia of Nuevo Laredo, it means higher prices for bottled water and produce.

Current dam levels: La Amistad and Falcon at crisis points

The latest IBWC data from Mexico’s side shows La Amistad dam at 28 percent of capacity and Falcon dam at 17 percent as of October 26, 2026. Both reservoirs sit on the Río Bravo, straddling the border of Coahuila with Texas (La Amistad) and Tamaulipas with Texas (Falcon). Their low levels are a direct reflection of reduced inflows from the river basin, which has been hit by consecutive years of below‑average precipitation.

These dams are not just storage facilities; they are lifelines for border communities. When La Amistad’s waters recede, the irrigation canals that feed the fields of the Valle de los Lagos dry up, forcing farmers to turn to costly groundwater pumps. Similarly, the Falcon reservoir supplies water to the municipal systems of Matamoros and Brownsville; its depletion threatens municipal water security, prompting officials to issue water‑use restrictions that affect households and small businesses alike.

Expert analysis: The need to revisit the treaty

Roberto Constantino, a researcher at the Metropolitan Autonomous University (UAM), told El Economista that the shrinking reserves in the Río Bravo and Colorado River basins jeopardize both compliance with the binational agreement and the basic water supply for communities on both sides of the border. He argued that the 1944 treaty, while historically significant, does not reflect the current environmental realities of a warming climate and more erratic rainfall patterns.

Constantino suggested a revision of the treaty to incorporate flexible delivery mechanisms that could adjust to drought conditions. However, he cautioned that the current political climate—marked by heightened bilateral tensions and a focus on trade negotiations—makes it a challenging moment to open a new round of treaty talks. The implication is clear: without a more adaptable framework, Mexico will continue to face a dilemma between meeting its legal obligations and protecting the water needs of its own citizens.

Impact on everyday families and workers

In the colonia of El Cristo, a mother of three, María García, describes how the water shortage has altered daily life. “We used to fill the cistern every week from the municipal line,” she says, “now we have to wait for the tanker trucks, and the water is sometimes brown.” The reduced flow also affects the local tortillería, where the dough must be mixed with water that is increasingly scarce and expensive.

For agricultural laborers in the ejido of La Paz, the low dam levels mean fewer acres can be planted, leading to reduced wages and heightened insecurity. The seasonal migration patterns that once sent workers north to Texas for harvest work are shifting, as the United States also faces water constraints that limit its own agricultural output. This interdependence underscores how a technical deficit in acre‑feet translates into real‑world hardships for families on both sides of the border.

Recent diplomatic steps and their limits

In October 2026, Mexico and the United States signed a plan aimed at easing the repayment schedule by agreeing to use less water from the Río Bravo. The intention was to create a buffer that would allow Mexico to catch up on its debt while preserving water for essential uses. Yet, as the IBWC data shows, compliance remains sluggish. The plan’s reliance on reduced withdrawals does not address the underlying scarcity of water in the reservoirs, which continues to sit well below the 30 percent threshold.

The diplomatic effort also highlights a broader strategic calculus. Both governments are keen to avoid escalating tensions that could spill over into trade disputes or immigration debates. Nonetheless, the limited progress on water deliveries suggests that the plan may be more symbolic than substantive, offering a temporary diplomatic gesture without solving the structural shortage that fuels the deficit.

Looking ahead: Scenarios for 2030 and beyond

With the 2030 deadline looming, Mexico faces a stark choice: accelerate repayment through intensified water transfers, invest in alternative water sources such as desalination or water‑reuse projects, or renegotiate the treaty terms to reflect a new reality. The IBWC’s current trajectory—low dam capacities and modest delivery volumes—makes the first option increasingly untenable without compromising domestic water security.

Community leaders in border towns are already organizing to demand a more sustainable approach. In the pueblo mágico of Real de Catorce, local activists have begun a campaign to raise awareness about the water crisis, linking it to broader issues of climate justice and indigenous water rights. Their message resonates with the families watching the water gauges at La Amistad and Falcon, hoping that their collective voice will push policymakers toward solutions that balance treaty obligations with the right to water for all.

This article was produced with AI-assisted research and editorial support. Reporting is based on the source material cited below. Sources: Mexico News Daily; mexiconewsdaily.com; Global1.News (14 November 2026).

By Rosa Martinez, Staff Writer