Apples to Oranges: A Comparison of Two State Statutory Approaches to Addressing Aquifer Mining, Depletion, & Drawdown in Colorado & Texas
Lexi Kay LeCroy • April 25, 2026

Benjamin Franklin once said, “When the well is dry, we’ll know the worth of water.” Unsurprisingly, the precious resource he acknowledged is the same one that people fought and died over. While violent disputes used to provide the typical means to acquire water rights, states since then regulated water ownership in a manner suitable to their geographical location and purposes. Texas and Colorado take their own respective approaches to statutory regulations, particularly when focusing on aquifers. This article compares how Texas Groundwater Conservation Districts and Colorado Ground Water Management Districts regulate aquifer mining and depletion.


Both states base their controlling schemes over water rights on the legal principle of “first in time, first in right.” However, Colorado assumed the Prior Appropriation Doctrine, Texas took on a hybrid version—the Rule of Capture. The Texas Legislature refining regulatory bodies governed mainly by said separate entities created by the state legislature supersedes the Rule of Capture. The Rule of Capture’s remnants remain in some of the current governing rules in Texas. Meanwhile, Colorado remains steadfast in its application of Prior Appropriation.


Despite having different approaches, Texas and Colorado both created Groundwater Conservation Districts to manage areas statewide with little to no water. This blog focuses specifically on those districts and the statutory foundations upon which they rest.


Regardless of the statewide structure governing water rights, both states share similar policy goals. In the face of environmental concerns, such as subsidence and the resulting evolving geological areas, both Texas and Colorado must address the ever-growing need for more water, both in and out of aquifers.


I.             State Approaches to Aquifer Regulation And Well Spacing


A.   Texas Groundwater Conservation Districts


After the U.S. Constitution and federal laws, the Texas Legislature holds the ultimate authority to enact laws governing water rights and management. It delegates specific powers to state agencies and local entities to implement and enforce the Texas Water Code through the Texas Commission on Environmental Quality (TCEQ). The genuine “boots on the ground” enforcers specific to groundwater management are Groundwater Conservation Districts (GCDs). Texas granted GCDs the authority to regulate well spacing and groundwater production. Statutorily, these GCDs remain the state’s preferred method of groundwater management to preserve property rights across Texas while balancing conservation and development concerns; however, the state not always prioritizes considerations of conservation and development.


Historically, Texas followed the Rule of Capture, which allows a landowner to pump water from beneath his or her property, even at the expense of his or her neighbor. The rule established in 1904 by the Texas Supreme Court in Houston & T.C. Ry. V. East, which held that a landowner had no legal remedy against a railroad company that had moved next door and drilled a larger well, causing the landowner’s well to go dry. The court’s simple solution for the landowner: drill a bigger, deeper well than the railroad. Over time, establishing GCDs addressed specific policy concerns and granted regulatory authority over groundwater. To simplify, Texas state law sets the framework; TCEQ rules govern broad permits and quality; and the GCDs manage groundwater production, depletion, and protection.


It is interesting to note that, under Texas law, tributary groundwater is not defined separately from non-tributary groundwater. Instead, the statute creates two primary categories of water: surface water and groundwater. The primary focus centers more on each GCD’s ability to adopt rules suitable for each aquifer, subdivision of an aquifer, or geographic area overlying aquifer boundaries. This can account for the unique characteristics of each aquifer, especially when considering the varying climates across the state, as well as to categorize the aquifer’s physical attributes—i.e., what Colorado distinguishes as tributary or non-tributary. GCDs combine the physical characteristics of an aquifer with defining the “best available science” to combat issues that may arise. This boils down to utilizing “conclusions that are logically and reasonably derived using statistical or quantitative data, techniques, analyses, and studies that are publicly available to reviewing scientists and can be employed to address a specific question.” The relevant question that arises from this statutory line of thinking is this: Is the reliance on scientific methods too exclusionary of relevant human interests? There seems to be a fine line. While science remains a strong method for determining relevant environmental concerns, it is not always kind to the economic and personal interests of smaller parties, such as farmers and ranchers living in rural areas.


B.   Colorado Ground Water Management Districts


As the state that first developed and implemented the Prior Appropriation Doctrine, Colorado remains known for its water courts and precedent governing all rights to water. The Prior Appropriation system dictates that appropriation occurs when someone removes water from a water source and then puts it to a beneficial use. The first person to take the water and put it to a beneficial use gains priority over subsequent appropriators, and once receiving a court decree verifying status, becomes a senior water right owner relative to subsequent appropriators. Senior owners’ priority over junior water right owners, with the underlying expectation that senior owners’ “call” for water fulfills before any other water owners.


Notably, the Colorado Ground Water Management Act of 1965 (GMA) modified said Prior Appropriation system to prevent unreasonable aquifer depletion on Colorado’s Eastern Plains, where notably less water connects to surface streams. The GMA established the Colorado Ground Water Commission (GWC), which governs the Ground Water Management Districts (GWMDs). Both entities have jurisdiction over designated groundwater, which is statutorily distinct from tributary groundwater. Designated groundwater encompasses water located within designated basins that either (1) would not feed into decreed surface water rights, or (2) is in areas lacking a constant natural stream where groundwater serves as the primary water source for at least 15 years prior to the basin’s designation. Essentially, this boils down to water that provides a de minimus impact on surface streams. The GWC holds the authority to adjudicate designated groundwater rights only, as well as issue large capacity well permits. In contrast, the GWMDs represent local districts wherein there is more administrative power within their designated boundaries. GWMDs retain authority to regulate the use, control, and conservation of groundwater within their boundaries. GWMDs can adopt controls and regulations to minimize the lowering of the water table, subject to review and approval by the GWC. If anything, this specific governance over designated groundwater provides a balance of economic development with aquifer sustainability.


II.           Regulatory Mechanisms to Handle Drawdown & Depletion


A.   Texas


Texas GCDs intend to regulate groundwater production to minimize aquifer drawdown, prevent subsidence, and protect water quality. To do this, GCDs can adopt rules to regulate well spacing to prevent well-to-well interference and reduce the depletion risk. GCDs can also limit groundwater production based on acreage and impose production limits to ensure sustainable aquifer use. GCDs consider a multitude of factors when implementing rules specific to drawdown and depletion regulation, including, but not limited to, hydrological conditions, recharge rates, and socioeconomic impacts, when estimating desired future conditions for aquifers. Further, Texas Water Code Chapter 36 grants GCDs discretion to regulate groundwater production to preserve historic or existing uses.


The main workhorse provision for dealing with well-to-well interference and localized depletion focuses on district regulation of well spacing and production to prevent waste and the protection of groundwater reservoirs. Many GCD rules base production limits on acreage or tract size and impose minimum spacing between wells to reduce interference between cones of depression and avoid unreasonable impacts on existing wells. At the same time, other statutory requirements require most non-exempt wells to obtain permits, and districts must evaluate those well applications against their management plans and the regional “desired future conditions.” Those desired future conditions essentially act as a statutory cap on how much depletion is acceptable in a particular aquifer. These implementations layer over the Rule of Capture, as well as case law, which push districts to balance their state-mandated code with potential takings claims when they limit pumping too aggressively.


B.   Colorado


Colorado GWMDs, on the other hand, govern designated groundwater, and the aquifers they govern are already facing long-term depletion. Instead of the pure conservation mandate that Texas possesses, Colorado’s statutes primarily focus on preventing “unreasonable injury” or “material injury” to existing water rights, as laid out in specific well-permitting provisions. The Colorado Supreme Court previously interpreted these statutes to mean that prior appropriators are not entitled to a “frozen” water table; i.e., that some drawdown is statutorily allowed so long as it does not unreasonably impair earlier wells.


Colorado’s permitting rules directly tie into well-to-well interference and aquifer mining. The GWC has to decide whether unappropriated groundwater is available and whether a proposed well will cause material injury to vested rights. It can deny or limit permits with conditions to follow if those standards are not met. In some situations, Colorado law requires augmentation or replacement plans, which provide means to replace depletions to avoid injury. Unlike Texas’s future conditions consideration, Colorado does not always aim to meet a specific target of drawdown; instead, the “unreasonable injury” and “material injury” language function as a legal limit for how much aquifer decline is tolerated within a designated basin.


II.           Challenges & Policy Considerations


A.   Comparison of the Challenges Each State Faces


One of the biggest challenges that Texas must consider is that its framework sits on top of the old Rule of Capture background, while also telling GCDs that they are supposed to conserve and protect the water that landowners think they own. The Texas Water Code recognized that landowners have “ownership of groundwater in place.” It then clarifies how that ownership is defined by stating that it is subject to “regulation under this chapter and under the rules adopted by a district.” At the same time, another section lays out what seems like an ambitious policy: districts must provide for “the conservation, preservation, protection, recharging, and prevention of waste of groundwater and of groundwater reservoirs or their subdivisions, and to control subsidence caused by withdrawal of groundwater.” In other words, GCDs essentially respect private property rights but also keep aquifers from being mined and the land from sinking, which is a bit of a tightrope.


Texas courts also added pressure by recognizing takings-like claims in groundwater regulation. The Texas Supreme Court previously acknowledged in Edwards Aquifer Authority v. Day that landowners possess a constitutionally protected interest in groundwater in place, and district regulations that go “too far” could potentially be held responsible for providing compensation. This could reasonably make a district nervous about utilizing the full extent of its statutory powers under provisions governing spacing and production, or even permitting, to really clamp down on drawdown and depletion. Thus, a district might actually be squeezed from three directions at once: landowners invoking precedent, regional desired future conditions that say “you can’t pump that much,” and a statutory conservation and subsidence mandate that doesn’t really create a clear safe harbor. It is not shocking that implementation looks uneven from district to district.


Colorado’s challenges look a little different because the foundational system is Prior Appropriation, but many of the practical roadblocks are similar. The Colorado GMA creates the category of “designated groundwater” and puts it under the jurisdiction of the Colorado GWC and local GWMDs. While considering the plain language of the statute seems clarifying, in reality, figuring out what is designated versus tributary, and how much connection there is to streams, can be complicated and politically touchy. Additionally, the GMA assumes that some level of aquifer mining will occur and then tries to keep it within tolerable bounds, which, in theory, is logical.


The GWC is supposed to issue large capacity well permits only when there is unappropriated groundwater and when existing rights won’t suffer substantial injury. As noted in Jaegar v. Colorado Ground Water Commission, the Colorado Supreme Court made it clear that prior appropriators in designated basins do not guarantee that the water table will stay where it was when they drilled; rather, the GMA protects from unjustified impairment. This gives the GWC and the local districts some flexibility, but also means that they must make controversial judgment calls about how much decline is too much. The Colorado Supreme Court also stressed that the GWC must weigh economic development and beneficial use against aquifer conditions when deciding whether additional wells are compatible with statutory standards. Thus, it seems that Colorado regulators constantly balance the statutory foundation of Prior Appropriation against the explicit decision in the GMA to allow planned depletion.


B.   Takeaways Each State Could Learn from The Other


One obvious notion that Colorado might learn from Texas is how to be more explicit about conservation and subsidence in the text of the statutes. Texas regulations remain quite blunt in stating that GCDs exist to conserve and preserve groundwater, recharge aquifers, prevent waste, and “control subsidence caused by withdrawal of groundwater.” That clear-cut statement of policy gives Texas districts a straightforward rule when they adopt strict spacing or production limits or when they justify denying permits. While Colorado’s designated-basin provisions in Title 37 speak about “beneficial use” and “material injury,” those provisions are less direct about long-term conservation goals. As climate change and long-term declines start to intensify, Colorado might benefit from adding a more modern conservation and aquifer-protection policy section.


Colorado could also look at Texas’s “desired future conditions” approach as a model for more explicit basin-wide planning. Texas code requires districts within a specific GCD area to adopt said conditions for each relevant aquifer, and then the Texas governing authority uses those estimated future standards to create modeled available groundwater values that effectively set a ceiling on permissible pumping. This process forces a collective conversation about how much drawdown is acceptable by a given year, which is quite necessary when considering juggling economic and environmental interests along with consumptive and domestic uses. Colorado’s GWC and GWMDs already retain their own authority to adopt basin rules, but there is less emphasis on calculating a specific future condition for the aquifer. Borrowing a concept such as a “designated basin future condition” could give stakeholders in Colorado a clearer sense of how the law is trying to guide long-term aquifer conditions, rather than leaving that mostly implicit in GWC decisions.


On the flip side, Texas might take a page from Colorado’s more candid treatment of aquifer mining and the concept of “unreasonable injury” in designated basins. The GMA basically admits that some aquifers will draw down over time, but insists that the drawdown managed so existing appropriators are not unreasonably or materially injured. Case law reinforces the idea that regulators should determine what decline is manageable and consistent with statutory standards, and then enforce that line. Texas’s “desired future conditions” framework does something similar in practice, but the statutory text is not strong enough to fully meet this bar. While some Texas code discusses conservation and planning, primary pieces of the code do not squarely address that, in some places, the political choice might be to allow a controlled mining of the aquifer to support agriculture or municipal growth for a limited time. Adding clearer verbiage about when and how planned depletion is allowed may make the entirety of the Texas Water Code more honest and, arguably, easier to defend in court.


Texas could also learn from Colorado’s more formal standard for material injury to protect existing users. In designated basins, the Colorado GWC must deny or issue conditional permits if doing so would cause material injury to vested water right owners.  Texas districts certainly mention protecting “historic use” and preventing waste, and are supposed to consider socio-economic impacts and aquifer conditions when setting “desired future conditions,” but the code does not provide explicit parameters for when the changes to an existing well are deemed unacceptable. Taking a more explicit, “no unreasonable impairment of existing wells” standard and embedding it in the Texas code could help districts justify tougher decisions to cut permitted amounts or deny new wells in already lowered or stressed areas.


III.         Conclusion

 

Texas and Colorado carved out their own statutory paths to address aquifer mining, depletion, and drawdown that reflects each state’s distinct legal traditions and environmental considerations. Texas relies on locally driven GCDs, guided by somewhat vague, broad conservation and subsidence control goals. Colorado’s GWMDs, created under the GMA, establishes a regime for designated groundwater, setting acceptable limits on aquifer decline through the Prior Appropriation standard. Both systems illustrate the difficulty of using law to ration a finite renewable resource. Overall, these systems suggest that future statutory refinements should focus on sharpening planning goals by integrating climate considerations and creating clearer statutory standards through updated terminology for the tolerable level of drawdown to support economic development and water-supply reliability.


SOURCES

  • Tex. Const., Art. XVI, § 59(a).
  • Tex. Water Code § 5.013.
  • Tex. Water Code § 36.116; see also Tex. Water Code § 36.101.
  • Houston & T.C. Ry. v. East, 81 S.W.279, 280 (Tex. 1904).
  • Id.
  • Tex. Water Code § 36.001.
  • See § 36.116.
  • Colo. Rev. Stat. § 37-90-103.
  • Tex. Water Code § 36.0015(a).
  • Id.
  • Water Rights, Colo. Div. of Water Rights, https://dwr.colorado.gov/services/water-administration/water-rights.
  • Colo. Rev. Stat. § 37-90-101; see also Jaeger v. Colo. Ground Water Com., 746 P.2d 515, 520, 523 (Colo. 1987).
  • Colo. Rev. Stat. § 37-90-103.
  • Colo. Ground Water Comm’n, Colo. Div. of Water Rights, https://dwr.colorado.gov/public-information/boards-and-commissions#:~:text=Colorado%20Ground%20Water%20Commission%20(CGWC,(Division% 20of%20Water%20Resources).
  • Colo. Rev. Stat. § 37-90-130.
  • Colo. Rev. Stat. § 37-90-131.
  • Colo. Rev. Stat. § 37-90-111; see generally Front Range Res., LLC v. Colo. Ground Water Comm’n, 415 P.3d 807, 811 (Colo. 2018).
  • Tex. Water Code § 36.0015(a).
  • § 36.116; see also Tex. Special Dist. Loc. L. Code § 8887.103.
  • Tex. Water Code § 36.108.
  • § 36.116.
  • Id.; see also Tex. Water Code § 36.101.
  • Id.
  • See Tex. Water Code § 36.1132; Tex. Water Code § 36.1071; Tex. Water Code § 36.108.
  • § 36.108.
  • See generally Edwards Aquifer Auth. v. Day, 369 S.W.3d 814, 832-33 (Tex. 2012).
  • Colo. Rev. Stat. § 37-90-137.
  • Jaeger, 746 P.2d at 520, 523.
  • Colo. Rev. Stat. § 37-90-137.
  • Colo. Rev. Stat. § 37-90-103(12.7); Colo. Rev. Stat. § 37-92-305.
  • § 37-90-137.
  • Tex. Water Code § 36.002.
  • Id.
  • Tex. Water Code § 36.0015.
  • See Edwards Aquifer Auth., 369 S.W.3d at 832-833.
  • Tex. Water Code § 36.116; Tex. Water Code § 36.113.
  • Colo. Rev. Stat. § 37-90-103.
  • Colo. Rev. Stat. § 37-90-137.
  • See Jaeger, 746 P.2d at 520, 523.
  • See id.
  • See Front Range Res., LLC, 415 P.3d at 811-12.
  • Tex. Water Code § 36.116.
  • See id.; see also https://dwr.colorado.gov/public-information/boards-and-commissions#:~:text=Colorado%20Ground%20Water%20Commission%20(CGWC,(Division% 20of%20Water%20Resources).
  • See Colo. Rev. Stat. § 37-90-137.
  • See Tex. Water Code § 36.108.
  • Id.
  • Colo. Rev. Stat. § 37-90-131.
  • Colo. Rev. Stat. § 37-90-137.
  • See Jaeger, 746 P.2d at 520, 523; see also Front Range Res., LLC, 415 P.3d at 811-12.
  • See Tex. Water Code § 36.108.
  • See Tex. Water Code § 36.0015.
  • Colo. Rev. Stat. § 37-90-137.
  • See Tex. Water Code § 36.116; see also Tex. Water Code 36.108.
  • Colo. Rev. Stat. § 37-90-137; see Jaeger, 746 P.2d at 520, 523.

Utah’s Proposed Lake Powell Pipeline & Its Implications for the Law of The River

By Haley Zahratka • April 25, 2026
I. INTRODUCTION The Utah Board of Water Resources (UBWR) proposed the Lake Powell Pipeline Project (LPP) to address increasing water demands in Washington County, Utah. The pipeline is projected to be approximately 141 miles long, diverting water from the Colorado River, beginning at Lake Powell near the Glen Canyon Dam and ending in Washington County, Utah. The pipeline diverts water from Utah’s Upper Basin allocation, but its ultimate use remains in the Lower Basin. The “Law of the River,” which governs the Colorado River, comprises of federal laws, court decisions and decrees, contracts, regulatory provisions, and interstate compacts. The guidelines for the Colorado River expired in 2025, and a new management plan must exist by the fall of 2026. The Upper and Lower Basin states must reach an agreement on how to allocate the Colorado River, or the federal government will step in. The Law of the River does not provide explicit guidelines on whether Upper Basin water can be used in the Lower Basin; however, textual interpretation, common law, concerns about precedent, and the existence of other alternatives indicate that other options should be explored before the LPP is constructed. This blog post discusses the details of the LPP, stakeholder positions on the LPP, the laws that govern the Colorado River, interpretations of the Compacts of 1922 and 1948, relevant case law, the policy implications of the LPP, and, lastly, potential resolutions. II. LAKE POWELL PIPELINE PROJECT The UBWR proposed constructing the LPP to transport water from the Lake Powell Reservoir by pipeline approximately 141 miles to Washington County, Utah, delivering up to 86,249 acre-feet of water. The LPP water is allocated to Utah but remains used in the Lower Basin within Utah. In 2006 the Utah State Legislature passed the Lake Powell Pipeline Development Act, which authorized the construction of the LPP. The US Bureau of Reclamation published a Draft Environmental Impact Statement (DEIS), recommending the Southern Alternative as the preferred alternative for the LPP. The DEIS states that this alternative would meet Washington County’s water needs by 2060, as it is economical, provides water security, complies with the Lake Powell Pipeline Development Act, and does not require tribal agreement. The permitting process for the project remains paused since 2020, due to resistance from surrounding states. The DEIS was published in June of 2020, and on September 8, 2020, in response, the Colorado River Basin states requested that a Final EIS not be approved until all seven states reached an agreement regarding the project. Nonprofit groups called for the pipeline’s removal from the permitting process on December 18, 2023, stating that the Colorado River does not have excess water for the pipeline and that this should not maintain priority over other Colorado River water right issues. III. STAKEHOLDER POSITIONS The LPP’s proponents argue that the pipeline is needed to diversify the water supply and provide a reliable water source for residents of Washington County. The county is projected to have a population increase of 155% by 2060, and receives over six million visitors, with seasonal residents owning 20% of the homes. Proponents argue that the pipeline will protect the environment by keeping water flowing through the Colorado River system, ensuring the health of the ecosystem. The pipeline alleges to promote the economy by keeping employers in the state and to prevent drought by providing additional water supplies and storage. The primary LPP proponents include state and federally elected officials, such as Senator Mike Lee, as well as many local industry and utility providers, community leaders, and municipalities. Various grassroots groups oppose the LPP . The Utah Rivers Council (URC) contends that the pipeline is unnecessary, expensive, and destructive. The URC states that Washington County consumes water at more than double the national average because of low water rates, and that population growth has been exaggerated. The URC alleges that the pipeline will cost at least 2.24 billion dollars of taxpayer money, which will increase water and property taxes. The URC states that this will disturb wildlife, spread invasive species, and reduce water flows in the Grand Canyon. If the Colorado River experiences only a 9% decline in flow, a 3.2 million acre feet (maf) water demand-supply imbalance will result. The Western Resource Advocates argue that the prepared DEIS does not account for projected increases in water efficiency, thereby inflating water demand. IV. BACKGROUND The Colorado River Compact of 1922 divided states into the Upper and Lower Basin. Colorado, Wyoming, Utah, and New Mexico make up the Upper Basin, while Arizona, Nevada, and California make up the Lower Basin. Upper Basin water is comprised of the parts of the Upper Basin states where water from the Colorado River drains above Lees Ferry. The same provision controls the Lower Basin, but for waters below Lees Ferry. The Colorado River Compact, however, is wrought with miscalculations. When the Compact was drafted, it was believed that there was between 17 and 20 maf of water to allocate and therefore allocated 7.5 maf to each basin. This calculation was made during a period of unusually high water flows, and therefore, allocates more water allocated than available. The Compact also requires the Upper Basin to ensure at least 7.5 maf are delivered annually to the Lower Basin. Additionally, the Upper and Lower Basins must each deliver half of the annual 1.5 maf requirement under the 1944 U.S.-Mexico treaty. The Upper Basin states have a legal obligation to deliver this water, and if they do not, they may be subject to a “Compact Call” requiring the Upper Basin to reduce its water use to satisfy that obligation. This would have serious implications for major cities in Upper Basin states, as many possess water rights that are junior to the Compact.  The Upper Colorado River Basin Compact of 1948 allocates water among the upper-basin states. After deducting the obligations required to comply with the 1922 Compact, Colorado is allocated 51.75%, Utah 23%, Wyoming 14%, and New Mexico 11.25%. The Compact of 1948 provides that if there is a Compact Call, water rights senior to November 24, 1922, are not subject to the call. The Colorado River Storage Project Act (CRPSA) came afterward to provide a stable system that allowed the Upper Basin states to make full use of their allocated water. The enactment of the CRPSA led to the authorization of the Flaming Gorge Dam and Reservoir, the Glen Canyon Dam, and Lake Powell. Lake Powell is the primary means of sending water to the Lower Basin. Beginning in 2000, the Colorado River system began to face drought concerns. This led to the 2007 Interim Guidelines, but with these guidelines expiring soon, new management guidelines are crucial. V. COMPACT INTERPRETATION The LPP raises the question of whether water from Utah’s Upper Basin can be used in St. George, Utah, in the Lower Basin. The Colorado River Compact of 1922 defines the Upper Basin as the portions of Arizona, Colorado, New Mexico, Utah, and Wyoming whose waters naturally flow into the Colorado River system. In Article VIII, it states, “[a]ll other rights to beneficial use of waters of the Colorado River System shall be satisfied solely from the water apportioned to that Basin in which they are situate.” This language seems to imply that water allocated to a basin must be used in that basin. However, the Compact of 1948 allocated 23% of Upper Basin consumptive water use generally to the State of Utah, not just the part of the state that is part of the Upper Basin. Additionally, the 1948 Compact subjected to the terms of the 1922 Compact, designates Upper Basin water based on drainage into the Colorado River, and no specific provision governs transbasin use in either Compact Agreement. Therefore, neither the 1922 nor the 1948 Compact provide explicit clarity on whether the use of Upper Basin water in the Lower Basin is permitted. VI. CASE LAW ANALYSIS Equitable apportionment, a federal common law doctrine, governs disputes between states as it pertains to their rights to interstate streams. The doctrine prevents states from forcing other states to follow the same water law system. Equitable apportionment aims to create a just allocation by considering many factors. The prior appropriation system primarily guides allocation, but physical conditions, climate, rate of return flow, consumptive use, storage water availability, and downstream or upstream impacts are all considered relevant. As states face the question of moving Upper Basin water for use in the Lower Basin, looking to a balancing test such as equitable apportionment offers a case-by-case analysis approach that is essential to an area of law as complex as the Law of the River. When applying this test to the LPP, the lack of storage water and the impact this would have on Lower Basin users weigh heavily against the construction of the LPP. Further, in Arizona v. California, the Supreme Court held that the Secretary of the Interior had broad powers to manage the Colorado River in the Lower Basin. The Secretary was not required to follow prior appropriation laws when allocating water. If the states of the Upper and Lower Basin are unable to come to a comprehensive interstate compact before the current guidelines expire, the LPP could also be subject to being decided by the Court and implemented by the Secretary, rather than being left up to the states to decide. VII. POLICY IMPLICATIONS If the LPP project receives a permit, it may set a precedent for other Upper Basin states to take similar actions, especially since the 1922 and 1948 Compacts do not explicitly bar interbasin transfers. If the LPP uses Utah’s allocated Upper Basin water for use in the Lower Basin, other Upper Basin states that do not utilize their full allocation may also attempt to take advantage of this “loophole.” However, Lake Powell continues to face lowered water level concerns. By December 2026, the water level may drop to a level at which hydropower cannot be generated. If Upper Basin states become more concerned with ensuring they receive what they are allocated, rather than focusing on renegotiating a water compact that addresses shortages, we will face an even more severe crisis in the coming years. VIII. POTENTIAL RESOLUTIONS The LPP is not the only solution to address concerns regarding access to water. Washington County could restructure its tax system to prevent water waste. The Washington County Water District (WCWD) collects enough money from property taxes that it enables the County to provide lower water rates. Washington County’s per-person water use is among the highest in the U.S., likely due to inexpensive water. WCWD could eliminate these property taxes, a tax most water districts do not collect in the West. This would benefit taxpayers and discourage water waste. Washington County could also install water meters, which could curtail secondary water use, just by showing users how much water they use. Secondary water users pay only an annual fee and therefore have no idea how much water they use, with some secondary water users overwatering by more than 100 percent. Resolutions such as these should be explored before removing water from Lake Powell. IX. CONCLUSION The LPP confronts an area of uncertainty regarding the 1922 and 1948 Compacts. When examining the language of these Compacts, nothing explicitly prevents the LPP from using Upper Basin water for Lower Basin use. However, the doctrine of Equitable Apportionment seems to indicate that if the LPP were to be litigated, it would not be found to be a reasonable measure, given the lack of water availability and the potential policy implications. Therefore, I advocate taking alternative approaches, such as restructuring Washington County’s tax structure or installing meters before constructing the proposed 141 mile pipeline. SOURCES U.S. Bureau of Reclamation, Lake Powell Pipeline Project Draft Environmental Impact Statement (2020). 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Cloud Seeding: a silver lining against aridification or environmental threat?

By Emily Funk • April 25, 2026
Dotting the Wasatch, Uinta, and La Sal mountain ranges in Utah stand 190 remote-controlled, cloud-seeding generators— the largest system of its kind in the world. Persistent aridification throughout the Southwest compelled Colorado Basin states, like Utah, to increase their budgets for cloud seeding. At the same time, states like Florida and Tennessee codified bans on all weather modification. Doubts about its efficacy, potential side effects, and conspiracy theories prompt questions of whether regional or national governance will provide the best regulatory framework for cloud seeding’s future. The Science Neither a fringe technology nor a recent invention, cloud seeding’s discovery took place in 1946 at the General Electric Research Laborator y in Schenectady, New York. There, chemists Vincent Schaefer and Nobel laureate Irving Langmuir showed that dry ice dropped into a cold cloud could cause ice crystal formation and snowfall. Soon after, Bernard Vonnegut found that silver iodide produced the same effect at warmer temperatures and much lower concentrations. Silver iodide remains the main cloud seeding agent ever since. More recently, countries like the United Arab Emirates tested hygroscopic flares containing natural salts such as potassium chloride, sodium chloride, and magnesium chloride to increase rainfall at higher temperatures. In Utah, between November and April, remote-controlled generators pump silver iodide (molecularly similar to salt) into storm clouds to coax more precipitation. Silver iodide provides sub-freezing water droplets with a nucleus on which to freeze and fall as snow or rain. Silver iodide does not create snow out of thin air. After the Great Salt Lake dropped to record low levels in 2022, Utah’s legislature expanded its cloud-seeding budget from $200,000 to $16 million, with a $5 million per year recurring allotment. Utah looks to further expand its seeding program by replacing airplanes with drones for more precise delivery, flying directly into the clouds where temperatures are optimal for ice nucleation. Skeptics have long voiced doubts about cloud seeding’s effectiveness in mitigating aridification caused by climate change . Until SNOWIE (Seeded and Natural Orographic Wintertime clouds: the Idaho Experiment), a groundbreaking 2017 study that demonstrated clear precipitation enhancement. Scientists, policymakers, and even beneficiaries debated its efficacy. As late as 2003, the National Research Council report stated that science could not confirm significant seeding effects with high confidence. SNOWIE moved the needle. Studies from Utah’s own operational programs now estimate precipitation increases of three to thirteen percent in seeded areas. At a cost of $5 to $10 per acre-foot, cloud seeding is extremely cost-effective compared to other water supply strategies. For example, Utah's Demand Management Pilot Program pays farmers $390 per acre-foot not to irrigate , and desalination costs in California exceed $3,000 per acre-foot. Currently active improvements to cloud seeding exist. A recent report to the Utah’s Division of Water Board indicated that cloud seeding increased the state’s snowpack by 10.4%, or 200,000 acre-feet, enough water to supply over 400,000 homes. Regional collaboration Because snowpack remains Utah’s largest reservoir, and more runoff means fuller downstream flows, the Colorado River Basin states of Arizona, California, and Nevada each contribute $500,000 to Utah’s cloud-seeding program. Idaho separately invested $1 million in Utah's cloud seeding operations focused on the Bear River watershed, a system that serves both states. These cross-border funding arrangements reveal an important fact about how cloud seeding functions in practice: it is inherently regional, tied to watersheds and river systems that do not respect state lines. A Nation Divided While Western states with starkly different politics unify under a cloud-seeding umbrella, a very different legislative story is unfolding in state capitals across the rest of the country. In 2024, Tennessee became the first state in the nation to pass a law banning cloud seeding and other weather modification activities. Florida followed in 2025 by passing a sweeping geoengineering prohibition that took effect July 1, 2025—classifying unauthorized weather modification as a felony punishable by up to five years in prison and fines of up to $100,000. Montana took a narrower approach, passing Senate Bill 473, which bans broad geoengineering practices but explicitly carves out cloud seeding for water resource management. Similar legislation was introduced in 2025 in Rhode Island, Pennsylvania, North Carolina, and Texas, among others. In early 2026, Iowa’s House passed a cloud-seeding prohibition. This legislative wave reflects a divergence in states’ political zeitgeist concerning weather modification projects. In the arid West, where ninety-five percent of Utah's water supply depends on seasonal snowmelt and ranchers, ski resorts, and hydroelectric utilities all possess a direct financial stake in snowpack levels, cloud seeding provides a practical tool in an increasingly desperate water-management toolkit. In states like Florida and Tennessee, where cloud seeding has not been practiced in decades— Florida’s program ended roughly fifty years ago—the legislation appears rooted less in water policy than in a political reaction to conspiracy theories about chemtrails and government weather control that circulated widely after Hurricanes Helene and Milton in 2024 . This current divergence makes national consensus on cloud seeding policy seem virtually impossible. Litigation, Liability, and the Causation Problem Cloud seeding’s litigation history in the United States is almost as old as cloud seeding itself and defined predominantly by the need to prove causation. The first weather modification lawsuit links to the 1916 California case of Hatfield v. City of San Diego, in which rainmaker Charles Hatfield contracted with the city to fill the Morena Reservoir; subsequent flooding triggered a wave of claims that ultimately settled without establishing legal precedent. In Slutsky v. City of New York, a resort owner sought an injunction, but the court denied it, holding that private parties hold no vested property rights in clouds or the moisture therein. Cases arising from seeding operations in Oklahoma and Michigan in the early 1970s—Samples v. Irving P. Krick, Inc. and Reinbold v. Sumner Farmers, Inc.—saw juries find that plaintiffs could not prove cloud seeding caused the flood damage they claimed. Absolute immunity for the federal government, based on the Flood Control Act of 1929, connected to cloud-seeding in Lunsford v United States after a 1972 flash flood in South Dakota caused property damage and over 200 deaths. Plaintiffs filed suit alleging that, prior to the flood, a contractor working for the Bureau of Reclamation of the US Department of the Interior, acted negligently while operating under threatening weather conditions. The pattern remains with remarkable consistency: even where a seeding operation can be established as a fact, connecting it to specific downstream harm has proven difficult, if not impossible, to demonstrate under standard tort causation frameworks. Federal versus State Regulatory Power In a Syracuse Law Review article, scholars Michael Conklin and Justin Robert Blount argue that the non-existent federal regulation over cloud-seeding, combined with the causation issues that make tort litigation ineffective, creates a legal vacuum that disproportionately harms disadvantaged communities. Manon Simon, in Enhancing the Weather: Governance of Weather Modification Activities in the United States, compares cloud-seeding regulation in California and Texas and concludes that weather modification laws across the states remain fragmented and inconsistent. The National Oceanic and Atmospheric Administration (“NOAA”) enforces the 1976 National Weather Modification Policy Act mainly by monitoring operations through required reporting of cloud-seeding operations and imposing fines of up to $10,000 for reporting failures. The case for federal regulation argues a straightforward idea: clouds do not recognize state borders. For example, a Wyoming cloud-seeding operation can deprive a Colorado watershed of precipitation that would otherwise fall there. Yet the past two years of state legislative activity suggest that governance at a national level might not be the best solution. Perhaps, the wildly divergent legislative responses to cloud seeding across American state capitals reflect not a regulatory failure but a feature of a functioning federal system. That is, states with disparate geographies, water needs, and political cultures reach disparate conclusions about the same technology. Utah and its neighbors in the Colorado River Basin expand cloud seeding programs because their survival depends on snowpack. Tennessee and Florida banned it because their electorates, shaped by different anxieties and different weather realities, demanded prohibition. Montana threaded the needle by banning stratospheric geoengineering while protecting cloud seeding in water management programs. Montana remains the only state that requires all weather modification operations to attain an Environmental Impact Assessment (“EIA”). These are not irrational positions. They are local judgments made by local governments in response to local conditions. Professor of Water Law at Arizona State, Rhett Larson, in his book Just Add Water, suggests that “the water-security paradigm should not be led by hierarchists, entrepreneurs, or ethicists. It should be led by regionalists.” Unlike issues such as carbon emissions and global climate change, the regionalist governance of water security keeps decision-making in the hands of those most familiar with the “unique climate, geology, hydrology, economy, and culture of water.” Utah illustrates this principle. The disastrous environmental implications of the drying of the Great Salt Lake, as well as possible reductions in Colorado River allocations, prompted the state legislature to take immediate action to channel more funding toward water management, including cloud seeding and research. The 2026 SNOWSCAPE initiative (Seeded and Natural Orographic Winter Storms Catchment Processes and Evaluation) is a collaborative research program that collects high-resolution data on key variables in cloud seeding to calibrate two highly specific measurement models. The project includes scientists from the University of Utah, the National Center for Atmospheric Research, and Utah State University. In addition, Utah launched a comprehensive trace-chemistry study to analyze snowmelt, stream water, lakebed sediments, and soils to detect silver at concentrations as low as parts per trillion. Appropriately, these innovative efforts to raise water levels throughout Utah without endangering the environment created by lawmakers and researchers best positioned to understand the State’s unique challenges. References Ben Winslow, Utah Now Runs the World’s Largest Remote-Controlled Cloud Seeding Program, FOX 13 NEWS (Oct. 9, 2025), https://www.fox13now.com/news/colorado-river-collaborative/utah-now-runs-the-worlds-largest-remote-controlled-cloud-seeding-program#google_vignette (last visited Mar. 24, 2026). Sarah A. Tessendorf et al., A Transformational Approach to Winter Orographic Weather Modification Research: The SNOWIE Project, 100 Bull. Am. Meteorological Soc'y 71 (2019), https://doi.org/10.1175/BAMS-D-17-0152.1 . Nat'l Research Council, Critical Issues in Weather Modification Research (2003), https://doi.org/10.17226/10829 . U.S. Gov't Accountability Off., Cloud Seeding Technology: Assessing Effectiveness and Other Challenges, GAO-25-107328 (Dec. 19, 2024), https://www.gao.gov/products/gao-25-107328 . Michael Conklin & Justin Robert Blount, Bad Policy Runs Downhill: How Cloud Seeding Jurisprudence Disproportionately Harms Disadvantaged Communities, 75 Syracuse L. Rev. 1 (2025), https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4851009 . Manon Simon, Enhancing the Weather: Governance of Weather Modification Activities in the United States, 46 Wm. & Mary Envtl. L. & Pol'y Rev. 149 (2021), https://scholarship.law.wm.edu/wmelpr/vol46/iss1/5 . Margaret Manto & Addy Baird, National Political Scrutiny of Cloud Seeding Looms Over Utah, Undark Mag. (Nov. 17, 2025), https://undark.org/2025/11/17/geoengineering-scrutiny-utah. Rhett Larson, Just Add Water: Solving the World's Problems Using Its Most Precious Resource (2020), https://global.oup.com/academic/product/just-add-water-9780190948009 .  Utah Div. of Water Res., SNOWSCAPE 2026, https://water.utah.gov/snowscape/ (last visited Mar. 24, 2026).