From Deep Wells to Farmer Strain: Managing Vietnam’s Coffee Water Shortage

Introduction

Water is the invisible foundation of Vietnam’s coffee industry. Without reliable irrigation during the brutal dry season — stretching from January to April across the Central Highlands — the Robusta coffee trees that generate nearly USD 9 billion in annual export revenues would fail to flower, fruit, or survive. Vietnam’s extraordinary yield advantage over global competitors — more than three times the world average per hectare — is not solely a product of fertile basalt soils and skilled farming; it is, in no small measure, a product of intensive, year-round irrigation that supplements the region’s seasonal rainfall deficit. Water, in this sense, is as much an input to Vietnam’s coffee economy as fertilizer, labor, or land.

Yet this foundational resource is under profound and accelerating stress. Decades of agricultural expansion, population growth, unregulated well drilling, and climate-driven shifts in rainfall distribution have collectively depleted the basaltic aquifers of the Central Highlands at a rate that experts now describe as an existential threat to the long-term viability of coffee production in the region. The water table that once required wells of merely 10 to 15 meters to access now demands drilling to 45 meters or beyond — and in some areas, even this depth yields no water. Stream flows that once reliably fed highland watersheds have declined by 40 to 60% since the 1990s. The 2016 drought alone left 70% of the Central Highlands cultivation area affected by severe water stress, and the 2024 dry season extended anomalously into May, depleting groundwater reserves that were still recovering from previous deficits.

This report, produced by the sustainability research team at KAI Farm, provides a rigorous, evidence-based analysis of water use and irrigation sustainability as a central challenge in Vietnam’s coffee sector. It argues that the hydrological crisis unfolding beneath the Central Highlands is not a distant risk — it is an active process whose consequences for smallholder livelihoods, supply chain stability, and ecological integrity are already being felt, and whose trajectory, absent transformative intervention, points toward progressive production decline in the world’s most important Robusta-producing region.

Overview of Sustainability in Vietnam’s Coffee Industry

Vietnam’s Central Highlands — encompassing Dak Lak, Gia Lai, Lam Dong, Dak Nong, and Kon Tum provinces — represent one of the most agriculturally intensive landscapes in Southeast Asia. Coffee cultivation covers approximately 720,000 hectares nationally, with the Central Highlands contributing around 92% of the total cultivated area and production volume. The region’s tropical savanna climate, characterized by a pronounced dry season of four to five months and an annual rainfall averaging approximately 1,600–2,000 mm concentrated in the wet season, creates both the conditions that make coffee cultivation possible and the seasonal water deficit that makes intensive irrigation unavoidable.

Sustainability in Vietnam’s coffee sector is understood across environmental, social, and economic dimensions. Water resource management sits at the intersection of all three: it is an environmental challenge because aquifer depletion constitutes irreversible ecological damage; a social challenge because differential access to water resources entrenches inequality between wealthier and poorer farmers; and an economic challenge because water scarcity directly constrains yields, increases production costs, and ultimately threatens the productive capacity on which the entire export economy depends. Of these interconnections, the environmental dimension — specifically, the accelerating depletion of the basaltic aquifers that underpin irrigation across the Central Highlands — is the most time-sensitive and least reversible, and therefore forms the analytical focus of this report.

Key Trends and Data Insights

The following table compiles key quantitative data on water use, irrigation patterns, aquifer status, and efficiency potential across Vietnam’s coffee-growing regions:

Several data points in this table demand particular analytical attention. First, the gap between typical farmer irrigation volumes (600–800 liters per tree per round) and the agronomically recommended optimum (400–420 liters) represents a structural over-application of between 30% and 100% — meaning that the majority of the water extracted from increasingly depleted aquifers does not contribute to crop productivity and is essentially wasted. Second, the daily extraction rate of 1.5 million cubic meters against an annual recharge rate of 1.4 billion cubic meters — equivalent to roughly 3.8 million cubic meters per day — suggests that extraction at current rates is approaching a critical threshold relative to natural replenishment cycles, particularly given that aquifer recharge following drought events takes 12 months or more. Third, the adoption rate of water-saving irrigation technologies at only 35% of farmers in Dak Lak, despite demonstrated economic and agronomic benefits, reveals a persistent behavioral and structural barrier to the technology diffusion that the hydrological crisis urgently demands.

Deep Dive: Groundwater Depletion and Irrigation Inefficiency as Vietnam’s Central Water Crisis

The Hydrogeological Foundation of Central Highlands Coffee Production

The Central Highlands’ coffee-producing capacity is built on a distinctive and finite hydrogeological asset: the basaltic aquifer system underlying the region’s volcanic plateau. These aquifers — formed through millennia of volcanic activity that produced the region’s characteristic red-brown basalt soils — store enormous volumes of water that are released slowly through natural seepage into streams and wells. They represent the critical buffer that enables dry-season irrigation: when surface water disappears from January to April, it is the basaltic aquifer that keeps Vietnam’s coffee trees alive and productive.

The total volume of water stored in the Central Highlands aquifer system is estimated at between 117 and 170 billion cubic meters — a seemingly vast reserve. However, this figure must be interpreted in the context of extraction rates, recharge dynamics, and the asymmetric geographic distribution of aquifer productivity. The basaltic aquifers are not uniformly deep, productive, or accessible: their thickness and water-yielding capacity vary significantly across the landscape, meaning that many farms — particularly those on hillsides or at the margins of the volcanic plateau — have extremely limited access to aquifer water even as the regional total appears adequate. As water tables fall in response to cumulative over-extraction, these marginal areas experience water stress first and most severely.

The Race to the Bottom: Competitive Well Deepening and the Tragedy of the Commons

Perhaps the most economically and ecologically destructive dynamic in the Central Highlands water landscape is what researchers have described as a competitive “race to the bottom” in well deepening. As shallower wells run dry — a process that has accelerated dramatically over the past two decades — wealthier farmers respond by drilling deeper boreholes to access deeper aquifer layers. A 2018 study in Dak Lak province found that each coffee field had, on average, at least one drilled well with a depth of nearly 27 meters. By 2023, the acting Director of the Western Highland Agriculture and Forestry Science Institute (WASI) reported that farmers now find no water even at 45 meters depth in many locations — a depth that represents a tripling of well requirements in less than two decades.

This dynamic embodies a classic “tragedy of the commons”: each individual farmer’s rational decision to drill deeper to protect their own production simultaneously depletes the shared aquifer resource on which all farmers — including their neighbors — depend. Wealthier farmers, who can afford the significantly higher cost of deep borehole drilling, progressively advantage themselves relative to poorer smallholders, who cannot match the capital investment required to access deeper water sources. The result is a compounding inequality in water access that tracks closely with existing income and land-ownership disparities: large-scale farmers secure their water supply through capital expenditure, while smallholder farmers on shallow wells face crop failure, income loss, and potential abandonment of coffee cultivation entirely.

The WASI Director’s warning — “If nothing changes, soon we will have no water to plant any trees here” — should be understood not as rhetorical exaggeration but as a technically grounded assessment of the trajectory implied by current extraction and recharge dynamics. At daily extraction rates of 1.5 million cubic meters, and with aquifer recharge taking 12 months or longer following drought events, the cumulative deficit in years of below-average rainfall — increasingly frequent under climate change projections — creates periods of acute water stress from which full recovery is not guaranteed within annual cycles.

The Over-Irrigation Problem: Cultural, Informational, and Structural Roots

Compounding the aquifer depletion crisis is the widespread practice of over-irrigation — the application of significantly more water per coffee tree than agronomic science demonstrates to be necessary for optimal yield and quality. Research conducted across four Central Highlands provinces documents that more than 80% of coffee farmers irrigate at volumes of 400–600 liters per plant per round, and approximately 7% apply more than 600 liters — far exceeding the agronomically optimal range. Extreme cases document individual farmers applying up to 800 liters per tree per round. The Alliance of Bioversity International and CIAT has documented that farmers routinely use two to three times more water than is necessary, driven by fear of yield loss and an absence of reliable soil moisture information at the farm level.

The roots of over-irrigation are multiple and reinforcing. Culturally, a generation of farmers who lived through periods of acute water scarcity and crop failure have internalized risk-averse irrigation behavior: the subjective cost of under-irrigating and losing a harvest is perceived as far greater than the cost of over-irrigating and wasting water, particularly when water has historically been treated as a freely available, unlimited resource. Informationally, most smallholder farmers lack access to soil moisture sensors, evapotranspiration data, or agronomic extension support that would enable evidence-based irrigation scheduling decisions. Structurally, the near-total absence of water pricing mechanisms — until the Vietnam Law on Irrigation introduced pricing provisions in 2021 — meant that over-extraction carried no financial penalty, eliminating market incentives for conservation. The combination of risk aversion, information deficits, and absent price signals has produced a sector-wide irrigation culture in which more water is implicitly equated with more yield security — a belief that scientific evidence robustly contradicts.

Climate Change as an Amplifier: Compounding a Pre-Existing Crisis

The groundwater depletion and over-irrigation crisis would be serious under any climatic scenario; under climate change projections, it becomes more severe in both frequency and magnitude. Vietnam’s Central Highlands is classified as one of the country’s most drought-prone regions — experiencing drought more frequently than any other region in Vietnam. Climate modeling using CMIP6 scenarios projects that irrigation water requirements for coffee in the Central Highlands will increase by up to 100 mm per season by the end of the century under high-emission pathways — a demand increase that would fall directly on the same depleted aquifer system. The 2024 dry season, which extended anomalously into May, represents a preview of the extended drought conditions that climate projections indicate will become increasingly normal.

The “double impact” dynamics documented by researchers — early-season drought coinciding with the critical coffee flowering stage (February to April), followed by late-season flooding that destroys harvested cherries — illustrates how climate change creates compound water risks rather than simple water scarcity. Survey data from Central Highlands farmers confirms that severe flowering-stage drought reduces average yields by 22.7%, while late-season flooding destroys an additional 18.5% of production through mold and quality degradation. These simultaneous extremes — too little water when trees need it, too much when cherries are drying — demand adaptive irrigation and drainage systems that current infrastructure cannot provide.

Root Causes and Systemic Challenges

Governance Failure: Unregulated Well Drilling and Absent Water Pricing

The most fundamental systemic cause of the Central Highlands water crisis is governance failure: the decades-long absence of effective regulation over groundwater extraction, well drilling, and irrigation volumes. According to WASI, 80% of the water used for coffee irrigation during the dry season is pumped from wells that are unauthorized — drilled without formal permits, without hydrological impact assessment, and without any monitoring of extraction volumes. In the absence of regulatory oversight, each farmer has individually rational incentives to maximize water extraction while the resource remains accessible, producing collectively irrational and ecologically destructive aggregate outcomes. The introduction of the Vietnam Law on Irrigation and associated water pricing provisions represents an important policy development, but enforcement capacity at the provincial level remains limited, and the transition from open-access to regulated groundwater use is far from complete.

Technology Adoption Gap: Structural Barriers to Water-Saving Irrigation

A robust body of evidence demonstrates that water-saving irrigation technologies — particularly drip irrigation and precision sprinkler systems — can dramatically reduce water consumption while maintaining or improving yields. A three-year field study conducted in Dak Lak province found that drip irrigation reduced water consumption by approximately 56% compared with conventional overhead sprinkler irrigation, while simultaneously delivering more than 50% higher yields per hectare and reducing the overall carbon footprint of coffee cultivation by nearly 60%. Research across four Central Highlands provinces consistently demonstrates that irrigation water can be reduced by 273–536 liters per tree per year in average rainfall years while maintaining yields above 3,000 kilograms per hectare. These are not marginal gains — they represent a fundamental improvement in resource efficiency that would substantially relieve aquifer pressure if adopted at scale.

Yet adoption of water-saving irrigation technologies remains at only 35% of farmers in Dak Lak province, with comparable or lower rates elsewhere. The primary barriers are well-documented: high initial capital costs for drip or precision sprinkler systems, insufficient access to financing for smallholder farmers, limited awareness of proven efficiency benefits, and inadequate extension support for technology installation and maintenance. The investment return on water-saving technology is positive over a 3–5 year horizon, but the upfront capital requirement exceeds what most smallholder households can self-finance, and credit access for agricultural technology investment remains limited in rural Central Highlands communities.

Landscape-Level Hydrological Degradation: Deforestation and Reduced Water Retention

The Central Highlands water crisis cannot be fully understood in isolation from the landscape-scale deforestation that accompanied the region’s coffee expansion. Forest cover plays a critical role in the hydrological cycle: trees intercept rainfall, slow surface runoff, promote infiltration into the soil and underlying aquifers, and maintain the cool, moist microclimate that reduces evapotranspiration. The loss of forest cover — driven significantly by agricultural expansion, including coffee cultivation — has progressively diminished these hydrological services. Analysis by the Vietnam Institute of Water Resources documents that the number and flow rate of streams and channels with flows of 0.5 liters per second or more declined by 40–60% between the pre-1990s period and 2020 across four Central Highlands provinces. The 2016 drought reduced main river discharge by 20–90% — an extreme but indicative event that reflects the reduced buffering capacity of a degraded watershed system. Research models indicate that transitioning drought-prone areas from coffee to tree crops and improving irrigation efficiency could increase dry season flow in key watersheds by up to 50% — a transformative benefit that underscores the systemic importance of landscape restoration alongside farm-level water management improvement.

Impacts on Stakeholders

Smallholder Farmers: Unequal Exposure to Water Stress

Smallholder farmers, particularly those with limited capital for deep well drilling or water-saving technology investment, bear the most direct and unequal burden of groundwater depletion. When shallow wells run dry during the critical dry-season irrigation window, affected farmers face a stark and unforgiving choice: leave trees unirrigated and accept yield losses of up to 22.7%, attempt to purchase water from neighbors or access shared irrigation infrastructure (where it exists), or borrow to finance emergency well deepening. For a farming household with no financial reserves — as is the case for the majority of rural households in the Central Highlands — none of these options is without severe economic consequence. The water crisis thus directly amplifies the farm income insecurity analyzed in KAI Farm’s previous report in this series, creating a cascading vulnerability in which ecological degradation translates directly into economic hardship at the household level.

The Competitive Well-Drilling Inequality

The emergence of competitive well deepening as a response to declining water tables has introduced a new dimension of inequality into the Central Highlands farming landscape. Wealthier farmers — those with larger landholdings, stronger credit access, and accumulated savings — can afford the progressively higher cost of deep borehole drilling. Poorer smallholders, who cannot match this investment, find their water supply curtailed precisely as neighboring deeper wells draw down shared aquifer levels. This dynamic converts what was historically a shared natural resource into a capital-intensive competitive advantage — one that systematically transfers productive capacity from the most vulnerable farmers to the most financially secure. It represents, in hydrological terms, an acceleration of the income inequality that pervades the broader coffee value chain.

National Export Competitiveness and Supply Chain Risk

For Vietnam’s coffee export sector and the international brands that rely on it, groundwater depletion represents a material long-term supply security risk. Vietnam’s competitive yield advantage — the single most important factor underpinning its cost competitiveness as the world’s largest Robusta supplier — is fundamentally dependent on reliable irrigation. If aquifer depletion reaches the threshold at which dry-season irrigation becomes impossible for significant portions of the Central Highlands cultivation area, yield losses would be severe, production costs per kilogram would rise sharply, and Vietnam’s competitive position relative to other Robusta origins (Uganda, Brazil, Indonesia) would erode significantly. International buyers, sustainability-focused roasters, and brands with long-term sourcing commitments in Vietnam face reputational and supply security risks that are directly proportional to the pace of aquifer depletion in their supplier farming communities.

Downstream Communities and Transboundary Water Systems

The hydrological impact of Central Highlands over-extraction extends beyond the immediate farming community. The Srepok, Sesan, and Sekong rivers originate in the Central Highlands and flow westward into Cambodia, constituting a critical transboundary water system that supports agricultural and domestic water use across multiple countries. Reduced dry-season flows in these rivers — directly attributable in part to over-extraction for coffee irrigation — have downstream consequences for Cambodian farming communities, riverine ecosystems, and the broader Mekong basin water balance. This transboundary dimension elevates the Central Highlands water crisis from a national agricultural management challenge to a regional ecological and diplomatic concern.

Strategic Recommendations

For the Vietnamese Government and MARD

• Establish a comprehensive, enforced groundwater regulatory framework for the Central Highlands, including mandatory well registration, metered extraction monitoring, and progressive volumetric pricing for agricultural groundwater use. The existing legal framework under the Law on Irrigation provides the basis for these measures, but enforcement capacity at the provincial level must be substantially strengthened through dedicated staffing, monitoring infrastructure, and financial penalties for unauthorized extraction.
• Invest at scale in shared community irrigation infrastructure — reservoirs, distribution networks, and managed recharge systems — that can provide reliable, equitably accessible dry-season water supply to smallholder farmers who currently depend entirely on individual wells. Community irrigation systems, such as the IDH/Nestlé/SIMEXCO pilot model in Ea Tan Cooperative covering 24,000 hectares and 6,600 households, demonstrate the viability and equity benefits of this approach and should be replicated across drought-prone growing zones.
• Launch a managed aquifer recharge program in partnership with IWMI and international hydrological research institutions, including the construction of infiltration ponds, check dams, and agroforestry corridors that maximize the conversion of wet-season rainfall into groundwater recharge. Given that aquifer recovery from drought events requires 12 months or more, proactive recharge investment is essential to maintain the long-term water balance of the basaltic aquifer system.
• Integrate water use efficiency requirements into all coffee certification, export licensing, and sustainability program frameworks, creating market-based incentives for irrigation efficiency improvement that complement regulatory approaches. Exporters sourcing from farms that demonstrate water-saving irrigation practices should receive preferential access to sustainability programs, financing instruments, and premium market channels.

For Exporters, Development Organizations, and International Partners

• Co-invest in water-saving irrigation technology adoption through blended finance mechanisms that address the upfront capital barrier for smallholder farmers. Subsidized equipment programs, low-interest green loans, and group purchasing schemes for drip and precision sprinkler systems can dramatically accelerate the 35% current adoption rate — evidence demonstrates that post-training farmers achieve irrigation volume reductions of 30–35% while maintaining yields, generating both environmental and economic returns that justify investment.
• Deploy digital tools for irrigation decision support at scale, including smartphone-based soil moisture monitoring applications, evapotranspiration advisory services, and the ThIRST (Targeted IRrigation Support Tool) platform developed for Central Highlands conditions. Technology-enabled irrigation scheduling has been shown to reduce water application while improving yield outcomes; wide-scale adoption requires extension support, digital literacy investment, and integration with existing farmer training programs.
• Fund landscape-level hydrological restoration initiatives in coffee-growing watersheds, including shade tree planting programs, riparian corridor restoration, and agroforestry system development that simultaneously improve water retention, reduce evapotranspiration, and sequester carbon. The evidence that more efficient irrigation and landscape restoration could increase dry season river flows by up to 50% provides a compelling investment case for watershed restoration programs embedded within coffee supply chain sustainability frameworks.

For Farmers and Farmer Organizations

• Transition immediately to evidence-based irrigation scheduling, replacing intuition-driven volume application with soil moisture monitoring and crop-stage-specific guidance. Post-training benchmarks from Olam and Nestlé programs demonstrate that farmers who adopt optimized irrigation protocols reduce water application from 600–650 to 400–420 liters per tree per round — a 35% reduction that simultaneously preserves aquifer resources, reduces energy costs for pumping, and maintains yield performance.
• Prioritize participation in cooperative-based community irrigation schemes where shared infrastructure can provide more equitable and reliable water access than individual well systems. Cooperatives that collectively manage irrigation infrastructure can also negotiate preferential access to shared reservoirs, coordinate extraction scheduling to minimize aquifer drawdown, and collectively invest in water-saving technology at group scale.
• Adopt intercropping and agroforestry practices that increase canopy cover, reduce soil evaporation, and improve on-farm water retention — thereby reducing the irrigation volume required to maintain tree health and productivity. Shade-grown coffee systems consistently demonstrate lower irrigation requirements than monoculture systems while also delivering quality and biodiversity co-benefits.

Conclusion

Vietnam’s Central Highlands sits atop one of the most agriculturally critical groundwater systems in Southeast Asia — a basaltic aquifer that has sustained the world’s most productive Robusta coffee landscape for decades. That aquifer is now in measurable, accelerating decline. Well depths that required 10 meters in the 1990s now require 45 meters. Stream flows have fallen 40–60%. Over 80% of irrigation water is extracted from unauthorized wells, at volumes two to three times greater than agronomic science demonstrates to be necessary. And climate change is simultaneously increasing irrigation demand while reducing the frequency and reliability of the wet-season rainfall that replenishes the aquifer.

The prognosis, absent transformative action, is stark: progressive water table decline, increasing inequality in water access between wealthy and poor farmers, yield losses in drought years that erode Vietnam’s competitive position in global Robusta markets, and eventual land abandonment in the most water-stressed cultivation zones. The acting Director of WASI’s warning — “If nothing changes, soon we will have no water to plant any trees here” — is not a distant hypothetical but a near-term trajectory implied by current data.

The solutions exist. Drip irrigation cuts water use by 56% while increasing yields by 50%. Optimized irrigation scheduling reduces over-application by 35% with no yield penalty. Community irrigation infrastructure provides equitable and reliable access where individual wells fail. Managed aquifer recharge can rebuild depleted water reserves. Landscape restoration can restore watershed hydrology. What is lacking is not knowledge or technology — it is the regulatory will, financial investment, institutional coordination, and farmer support systems required to deploy these solutions at the speed and scale the crisis demands.

For KAI Farm and all stakeholders with a long-term commitment to Vietnam’s coffee sector, water sustainability is not a peripheral environmental concern — it is the physical precondition on which the entire industry rests. Without water, there is no coffee. Without managed, equitable, and efficient water use, there is no sustainable coffee future in the Central Highlands. The window for proactive intervention is open — but the aquifer does not wait.

Hoang Luan, M.Sc.
Data Analysis Team, KAIFarm®