This is a long-form reference article. It documents what recent science shows about groundwater depletion in the Rio Grande–Bravo Basin and explains why New Mexico’s groundwater crisis is no longer a matter of insufficient data, authority, or technical capacity, but of governance. What follows provides the supporting evidence, context, and institutional history behind this conclusion.
What the Science Now Shows
In the first comprehensive basin-wide assessment of consumptive water use and replenishment, the study Overconsumption Gravely Threatens Water Security in the Rio Grande–Bravo Basin quantifies unsustainable use at sub-basin scales (smaller, localized areas) from the San Luis Valley in Colorado, through New Mexico, and on both sides of the international border to the river’s terminus at the Gulf of Mexico. A November New Mexico Water Advocates article first directed readers to this research. This article reports on its findings and explains their implications for water management decisions in New Mexico and across the basin. Together with prior reporting by New Mexico Water Advocates, the study provides a documented scientific foundation for examining why groundwater governance in New Mexico has failed to keep pace with what is already known.
The study authors’ basin-wide accounting of water use in the Rio Grande–Bravo Basin concludes that more than half (about 52 %) of all water consumed in the basin is unsustainable, meaning it is withdrawn faster than it can be replenished. The study finds that irrigated agriculture accounts for roughly 87 % of all direct consumptive water use, making it by far the dominant driver of depletion. Within that agricultural use, forage crops grown primarily for livestock feed—especially alfalfa and other hays—account for approximately half of total agricultural consumption, far exceeding the water use of food crops for direct human consumption. This pattern of overconsumption threatens long-term water security for millions of people who depend on the Rio Grande and its connected aquifers.
The New Mexico context for the report’s basin-wide findings is provided by the Office of the State Engineer’s 2020 Water Use by Categories report, which estimates that irrigated agriculture accounted for approximately 78 percent of total statewide water withdrawals in 2020.[i] New Mexico facts are consistent with the Rio Grande–Bravo Basin finding that irrigated agriculture is the dominant driver of water demand and depletion. These facts reinforce the conclusion that New Mexico’s groundwater challenges are structural and governance-related rather than informational.
While municipal and industrial uses account for a comparatively small share of consumptive demand, hundreds of thousands of acres of irrigated hay and forage, much of it supplied solely from groundwater, are a primary contributor to agricultural consumptive use in the state. This state-level pattern mirrors the basin-wide findings and reinforces that unsustainable groundwater depletion in New Mexico is already well documented. The biggest challenge is not scientific uncertainty, but the willingness and capacity to govern groundwater use for greater longevity and security.
What This Means for Groundwater Governance
This scientific clarity matters. It demonstrates that we now have sufficient information to begin governing New Mexico groundwater use responsibly, rather than waiting for better information and complete characterization of every aquifer.
This point corrects a common misconception. Groundwater management does not require complete scientific certainty before action can begin. Basin-wide water balance and depletion trends are already documented at scales relevant to governance. The science and the Office of the State Engineer’s water use reports define the problem; the primary challenge is the Office of the State Engineer’s institutional follow-through.
The Role of the New Mexico Bureau of Geology and State Water Resources Agencies
Ongoing hydrogeologic investigations by the New Mexico Bureau of Geology and Mineral Resources remain essential. The Aquifer Mapping Program is far more than mapping. With meaningful funding in the current fiscal year,[ii] the Bureau has already flown aerial resistivity surveys over critical aquifers, generating data that inform where wells should—and should not—be drilled. The Bureau will oversee drilling and instrumentation of permanent characterization and monitoring wells to define vertical aquifer structure, discrete water quality zones, faults, and other barriers to groundwater flow. This drilling will also help determine the volume and potential yields of deeper brackish and saline formations beneath freshwater zones. Together, these efforts provide the foundation for systematic, long-term groundwater monitoring that will steadily reduce uncertainty about aquifer behavior and define both the possibilities and limits of brackish water development.
The Office of the State Engineer and the Interstate Stream Commission are the agencies legally responsible for administering water rights, enforcing limits, and planning for sustainable water use. Scientific programs strengthen their technical foundation, but the desire for more complete science should not be a reason to forego initiating governance actions. The current agency approach appears to defer meaningful groundwater governance until regional water security planning recommendations are completed, even in areas where community water supplies are already threatened by continued agricultural pumping. Deferring enforceable limits under these conditions is a decision to allow ongoing aquifer depletion to continue unchecked, increasing the likelihood of irreversible impacts to local communities, higher costs, and accelerated decline.
The January 2026 New Mexico 360 Groundwater Report, published by the New Mexico Groundwater Alliance, makes clear that the State Engineer already has legal authority to preserve groundwater supplies by limiting pumping. That authority includes conditioning, limiting, or denying groundwater permits; regulating pumping in fully appropriated and mined basins; requiring metering and reporting; and managing groundwater pumping to protect connected surface waters and meet interstate compact obligations.
The regional water security planning program, unanimously authorized by the 2023 Legislature, has yet to gain traction through formally adopted rules. The Interstate Stream Commission will promulgate the rules and must then issue guidelines. After that, it can make state funding grants to regions, which must form regional councils to organize themselves to oversee preparation of their region’s plan. Plans won’t be drafted, approved by the councils and subsequently by the ISC, and funded for implementation for many years. This makes the promise of water planning an insufficient basis for delaying near-term groundwater governance, given that aquifers are already being drained by agricultural pumping to the detriment of communities.
The Real Bottleneck: Chronic Governance Incapacity
New Mexico’s experience demonstrates that groundwater can be managed effectively when the State or local institutions choose to do so—but that such management has been applied unevenly, episodically, and without being institutionalized statewide. Almost all groundwater management has been reactive to crises. For example:
- Pecos Valley Artesian Conservancy District – The clearest example of long-standing active groundwater management is the Pecos Valley Artesian Conservancy District (PVACD), created in 1932 in response to catastrophic loss of artesian pressure in the Pecos Valley around Roswell and Artesia. There, groundwater use has been actively regulated for decades to prevent collapse of the aquifer system. That experience shows that sustained groundwater governance is possible in New Mexico when depletion is undeniable and consequences are unavoidable.
- Pecos River – Pecos River water management now seems routine, but it has been difficult, costly to taxpayers, and entirely reactive. Farmers went to jail for sabotaging the operation of water meters required by court order. New Mexico lost a Texas lawsuit in the U.S. Supreme Court and is now subject to a Pecos River Compact 1987 Amended Decree that it came extremely close to violating annually for more than a decade. A State-driven collaboratively developed solution became state law in 2001. It required arrangements to get more water through the last dam in New Mexico and pause farming on productive farmland in the Carlsbad Irrigation District and the PVACD. It succeeded, but increasing water scarcity driven by global warming may require action beyond the settlement.
- Lower Rio Grande – A second form of groundwater management is now emerging in the Lower Rio Grande as a result of a 2013 Texas lawsuit before the U.S. Supreme Court. The pending Consent Decree and Settlement agreements focus squarely on New Mexico’s groundwater pumping from the irrigated valley floor’s alluvial aquifer, which is well connected to the Rio Grande. The Settlement requires that the State of New Mexico maintain groundwater levels adjacent to and beneath the river high enough to prevent the portion of the river’s flow legally allocated to Texas and the United States from instead sinking into the New Mexico riverbed. The State must meet mandatory downstream delivery obligations under tight compliance deadlines.
Notably, drinking water purveyors (community water utilities) depend on rights that the state water rights adjudication court has determined are junior to the irrigators’ 1903 priority rights to a full supply, whether from the river or groundwater. In recent years, the New Mexico share of Caballo Dam releases has not enough to satisfy the irrigators’ senior rights to a full supply. The State Engineer will be compelled to administer water in the Lower Rio Grande to prevent illegal underdelivery of water to El Paso as required by the Settlement.
- Middle Rio Grande – The Middle Rio Grande presents an even more complex picture. The Albuquerque Bernalillo County Water Utility Authority proactively prevented a groundwater-overdraft disaster from the excellent aquifer it’s built over. The solution was implementing direct use of its imported surface-water rights. Groundwater levels underneath Albuquerque partially recovered and stabilized, stopping the risk of aquifer compaction that would cause differential subsidence across faults that traverse the city. Albuquerque’s achievement matters—and it contradicts the notion that New Mexico acts only after collapse.
This was a local utility response, not basin-wide governance. Conjunctive-use benefits projected in the Authority’s 100-year plan have not materialized as assumed. The volume of available surface water treated and delivered to customers is far below the plan’s assumptions. Current Middle Rio Grande surface and groundwater uses will cause a new Rio Grande Compact violation in two to three years, while the ABCWUA says publicly it will supply new high-water use industry that the State and the City of Albuquerque are recruiting. The effective ABCWUA position is that it is preferable to be upstream with junior deep wells than downstream with senior surface water rights. Santa Fe also implemented a direct river diversion for drinking water, but its motivation was to prevent running out of water. Los Lunas has been and is recruiting high water use industry to fully use their water rights, and now seeks to transfer additional water rights that may be legally abandoned into their wells. Former State Engineer Mike Hamman clearly recognized the necessity of basin-scale conjunctive management in the Middle Rio Grande, but several years later, no progress is apparent.
Taken together, these examples show that New Mexico’s groundwater management successes are isolated, situational, and non-systemic. The problem is not scientific uncertainty, lack of authority, or technical infeasibility. The problem is the failure to institutionalize groundwater governance before crisis, litigation, or compulsion makes inaction untenable.
The State’s Water Resources Management Imperatives
New Mexico’s groundwater crisis is not the result of scientific uncertainty or the absence of legal authority. It is the result of governance failure—decisions by elected and appointed leaders to defer action even as the consequences become unavoidable.
The scientific paper by Richter et al. reinforces what has been understood for decades: aquifers are finite, groundwater depletion is measurable, and continued overpumping leads to permanent losses of water supply, water quality, and economic security. These are physical limits. They do not yield to delay, political convenience, or administrative caution.
New Mexico already has the legal authority to manage groundwater use. Under existing law, the State Engineer can condition, limit, or deny groundwater permits; regulate pumping in fully appropriated and mined basins; require metering and reporting; and manage groundwater pumping to protect connected surface waters and interstate compact obligations. No new statutory authority is required to begin managing groundwater based on aquifer conditions.
Gaps in aquifer characterization and monitoring remain real and must be addressed. But neither the science nor the law supports using those gaps as an excuse to postpone management. Data development and management must proceed together. Waiting for perfect information while aquifers decline only increases costs and reduces or eliminates future options.
Despite this, New Mexico continues to rely on administration that is largely disconnected from aquifer conditions. Groundwater permits are issued and administered without enforceable limits tied to aquifer longevity, even where declines are severe and well documented. Outside the one managed basin, groundwater governance remains the exception rather than the rule.
What Is at Stake—and Who Is Responsible
New Mexico’s groundwater crisis persists not because the State lacks financial resources, but because the Legislature has repeatedly chosen not to appropriate them at the scale required. The legal authority to manage groundwater exists. What is missing is the sustained investment needed to build and maintain the institutional capacity to use that authority effectively.
Across state government, funding for water resources planning, groundwater science, monitoring, enforcement, and long-term management remains inadequate. Agencies are expected to address widespread aquifer depletion with fragmented data systems, insufficient staffing, and short-term appropriations that fall far short of the problem’s scope. This chronic underfunding ensures continued incapacity, regardless of statutory authority.
That incapacity is not accidental. It reflects legislative choices. Year after year, the Governor recommends and the House and Senate Finance Committees set budgets that do not provide the resources necessary for groundwater management.
More fundamentally, New Mexico has not been willing to explicitly acknowledge groundwater management as a core governing responsibility that requires a defined program and durable capacity. Without naming groundwater management as a priority, the Legislature avoids the obligation to fund it, and agencies are left unable to deliver it.
The consequences of this failure are already visible. Households are hauling water because wells have gone dry. Communities dependent on groundwater face rising costs, declining water quality, and increasing long-term risk. New Mexico has many ghost towns—once viable communities that declined when the resources they depended on were exhausted. Groundwater-dependent communities face the same risk if groundwater depletion for irrigation continues unchecked.
Preventing that outcome is a matter of choice. The constraint is not science, not legal authority, and not the absence of money. It is the absence of political will to name groundwater management as a governing responsibility—and to fund the capacity required to carry it out. New Mexico’s future requires top elected and appointed officials to name and describe our groundwater sustainability crises, face the sacrifices required to increase groundwater longevity, and build the state institutional capacity needed to confront and solve those crises.
[i] Office of the State Engineer / Interstate Stream Commission, 2020 Water Use by Categories, summarized at mainstreamnm.org , “How data can inspire action: A closer look at the Water Use by Categories report” (Jan. 2025). The report estimates approximately 2.97 million acre-feet of withdrawals for irrigated agriculture out of roughly 3.81 million acre-feet of total statewide withdrawals in 2020 (≈ 78 percent). Irrigation withdrawals are not directly metered in most areas and are estimated using crop acreage, irrigation requirements, and other standard water-use accounting methods. The report presents withdrawals, not consumptive use.
[ii] The Bureau of Geology requested $29 million for this year and the next two to initiate their planned $175 million aquifer characterization plan, but the Governor, the House Appropriations and Finance Committee, and the Senate Finance Committee successively reduced their appropriation to $7.5 million. The Bureau may receive a $22.5 million budget this year, having demonstrated strong performance.