The Great Lakes, holding 90% of North America’s fresh surface water, are facing unprecedented challenges as data centers proliferate in the region. These facilities, essential for powering digital services and artificial intelligence, consume vast amounts of water for cooling purposes. This surge in demand raises concerns about the sustainability of the Great Lakes’ water resources and the potential ecological impacts.
As of August 2025, Illinois and Ohio rank among the top five U.S. states in terms of data center numbers, with 223 new facilities in the Great Lakes region. Hyperscale data centers, which support large-scale operations like generative AI, can consume between 1 and 5 million gallons of water daily. This consumption is projected to reach up to 150.4 billion gallons annually over the next five years, equivalent to the annual water usage of approximately 4.6 million American households. Such extensive water use poses significant risks to the region’s delicate water balance, especially considering the Great Lakes Compact’s prohibition on large-scale diversions outside the basin. The current legal framework may be inadequate to manage this new wave of high-consumption industries effectively.
Data Centers’ Water Consumption and Its Implications
Data centers primarily use water for cooling servers, which generate substantial heat. In evaporative cooling systems, water absorbs heat from servers and evaporates, requiring a constant supply of cold water. Some data centers also draw groundwater for cooling, returning it to local surface waters, which can alter local flow regimes. This practice raises concerns about groundwater depletion and contamination risks.
The Alliance for the Great Lakes reports that data centers are not required to report their water consumption, leading to a lack of transparency. It’s estimated that fewer than one-third of data centers currently track water usage. This lack of reporting makes it challenging to assess the cumulative impact of these facilities on the Great Lakes’ water resources.
Proposed mega-facilities, like a data center campus in Port Washington, Wisconsin, highlight the tension between economic incentives and water sustainability. While such developments can drive economic growth, they also pose significant risks to water resources, especially in areas already facing water scarcity issues.
Environmental and Ecological Concerns
The increased water consumption by data centers can lead to several environmental issues. Over-extraction of water can result in lower water levels, affecting aquatic habitats and biodiversity. Additionally, the discharge of heated water back into local waterways can raise temperatures, harming aquatic life. The cumulative effect of multiple data centers can exacerbate these problems, leading to long-term ecological instability.
Climate change further complicates the situation by disrupting historical precipitation patterns and increasing evaporation rates. This leads to reduced water availability in the Great Lakes, making it even more challenging to meet the growing demands of data centers and other industries.
Moreover, the lack of conservation or efficiency standards for the data center industry means that there are no guidelines to mitigate water usage. Without such standards, the region faces the risk of unsustainable water use, which could impact drinking water supplies, businesses, and food production.
Policy and Regulatory Challenges
The Great Lakes Compact, established to prevent large-scale diversions of water outside the basin, does not account for the internal demands of industries like data centers. This oversight means that states and local governments may not be prepared to manage the unprecedented water demands from these facilities. The absence of water use reporting requirements and the use of non-disclosure agreements by data centers further complicate the situation.
States like Michigan have authorized new tax breaks to attract data centers, but these incentives often do not consider the limited water resources available. This approach can lead to over-extraction and potential water shortages, affecting both the environment and local communities.
Furthermore, the lack of comprehensive water management mechanisms means that over-extraction, or ‘de-watering,’ can occur without adequate oversight. This situation underscores the need for updated policies and regulations to address the challenges posed by data centers’ water consumption.
Recommendations for Sustainable Development
To ensure the sustainable development of data centers in the Great Lakes region, several measures are recommended. First, implementing water use reporting requirements for data centers can provide transparency and help monitor consumption patterns. Second, establishing conservation and efficiency standards can guide the industry toward more sustainable practices. Third, conducting comprehensive studies to assess the cumulative impact of data centers on water resources can inform policy decisions. Finally, integrating water availability into economic development planning can prevent over-exploitation and ensure that water resources are used responsibly.
Additionally, investing in groundwater mapping and regional planning can help prepare for future water demand and mitigate potential conflicts. Collaboration between state and local governments, environmental organizations, and the data center industry is essential to develop strategies that balance economic growth with environmental sustainability.
By adopting these recommendations, the Great Lakes region can better manage its water resources, ensuring that both the environment and the economy can thrive without compromising the health of the lakes.
The rapid expansion of data centers in the Great Lakes region presents significant challenges to the sustainability of the lakes’ water resources. Without proactive measures, the cumulative water consumption from these facilities could lead to water shortages, ecological degradation, and economic repercussions. It is imperative for policymakers, industry leaders, and communities to collaborate in developing and implementing strategies that promote responsible water use and environmental stewardship.
By prioritizing sustainable practices and integrating water resource management into development planning, the Great Lakes can continue to support both technological advancement and ecological health, ensuring a balanced and prosperous future for the region.
