Water tanks for data centers: the two fold challenge of cooling and fire protection
With the boom in AI and the continued growth of cloud services, data centres require increasingly large amounts of water storage to ensure the continuity of their equipment via heat management and guarantee the security of critical infrastructure. This rapid development reflects a global trend in which digital systems, data management and high-performing technologies are becoming central to industrial and economic strategies.
In many regions, this dynamic comes into conflict with policies aimed at conserving natural resources, particularly in relation to water management, energy consumption and environmental impact. Water reservoirs are no longer merely isolated technical elements: they are becoming strategic components integrated into modern digital infrastructure.
"In France, 575,000 cubic metres of water were used in 2024 solely for the thermal management of data centres, with the majority coming from drinking water sources"
Source : ARCEP, Enquête annuelle pour un numérique soutenable 2026 (données 2024)
| 25.5 million litres of water per year | 4,3 GW | 45 % |
|---|---|---|
| A 1-megawatt power station consumes, on average, the equivalent of the electricity used by 300,000 people. | Projected data centre capacity in France by 2035 | Of global data centres are located in areas at risk of flooding. |
Why Is a Water Storage Tank Essential for Data Centers?
Data centers generate significant amounts of heat due to the high density of servers and the intensity of computing workloads. Maintaining continuous thermal control is essential to ensure system stability, equipment performance, and the uninterrupted availability of digital services. Today, a water storage tank for data centers has become a strategic asset, supporting server cooling, operational continuity, and the protection of critical infrastructure.
Any interruption to the water supply can quickly compromise operating conditions, particularly in high density facilities. In certain regions, especially those facing water stress or extreme climate variability, public water networks may reach their capacity during periods of peak demand.
In this context, having an on site water storage tank provides greater control over water consumption, reduces dependence on external infrastructure, and improves overall system resilience. It also helps minimize the environmental impact associated with water supply, energy consumption, and increasingly stringent sustainability requirements.
Modern data center water management systems are built around integrated architectures that combine water storage tanks, hydraulic distribution networks, water recycling solutions, and digital monitoring tools that continuously track environmental and operational performance.
The required capacity of a data center water tank depends on several factors, including installed IT load, server density, the cooling technology in use, fire protection requirements, and the desired level of operational autonomy. Operators typically size storage capacity based on daily water demand, usually measured in cubic meters or thousands of liters. For large scale facilities, several hundred thousand liters of stored water may be required to maintain operations during peak consumption or interruptions to the municipal water supply.
In the most advanced data centers, capacity planning also takes into account equipment energy efficiency and the anticipated growth of AI driven computing workloads. A properly sized water storage tank therefore plays a key role in optimizing water use while reducing operational risk and improving long term infrastructure resilience.
Regulatory requirements
In France, data centres are generally subject to regulations and are classified as high-rise buildings. French regulations impose a minimum volume of 30 m³ for systems related to facility safety. However, this threshold represents a basic requirement that does not meet the operational needs of modern infrastructure, where availability and continuity constraints necessitate significantly greater storage capacities.
At European level, the Pollutant release and transfer registers (PRTR) and the Environmental Code regulate water intake and disposal. Depending on the project, additional technical standards such as FM Global, NFPA or AWWA may also apply, depending on design and operational requirements.
The four key roles of a data centre water tank
1. Maintaining server temperature conditions
Systems that use water for temperature control, whether adiabatic solutions or direct-to-chip technologies, require a continuous and stable water supply. A buffer tank ensures uninterrupted operation, even in the event of a disruption to the external water supply.
2. Infrastructure protection and risk management
Data centre environments feature a high density of cables, continuous power systems and lithium-ion batteries. This configuration presents specific risks that require appropriate protective measures.
The immediate availability of a power source independent of the public grid helps to secure facilities and ensure operational continuity in the event of an incident. These systems play a central role in risk management and the protection of critical infrastructure.
3. Water Recycling and Resilience (Reuse)
Operators are subject to reporting requirements regarding their water consumption (Article L.236-1 of the French Energy Code). A well-designed tank enables the collection and reuse of process water, reduces withdrawals from the public water supply, and improves the overall management of water consumption data.
This also contributes to improved WUE (Water Usage Effectiveness) indicators, whilst promoting more sustainable practices.
4. Scaling up to meet the demands of AI
The ongoing increase in the demands placed on artificial intelligence systems is leading to a significant rise in technical and water resource requirements. Infrastructure must therefore be capable of scaling up gradually without requiring a complete overhaul of the existing facilities.
Modular solutions enable this scaling up to be managed flexibly, particularly at large-scale sites or those integrated into complex industrial areas.
Have you assessed the water supply requirements for your data centre?
Since 1987, APRO Industrie has been designing and manufacturing bolted steel tanks suitable for critical infrastructure. Modular, scalable and compliant with AWWA and NFPA standards, our liquid storage solutions can be adapted to suit any site requirements.
Discover our water tanks for data centers→
Cooling and fire protection: two uses with different requirements
These two applications have distinct requirements regarding water quality, flow rate, and pressure. They must be clearly differentiated during the design phase.
| Use | Related system | Specific features of storage |
|---|---|---|
|
Cooling |
Cooling towers, adiabatic systems, DLC |
High volume, treated water, continuous availability |
|
Fire protection |
HI-FOG high-pressure systems, pre-action sprinklers |
Potable water, rapid response |
|
Contingency reserve |
Backup power supply in the event of a power cut |
Autonomy of several hours; physical isolation recommended |
|
Recycling and reuse |
Recycling systems, greywater |
Stored separately; pre-treatment required |
Why Choose a Bolted Steel Tank?
Faced with the specific requirements of data centers, bolted steel tanks offer several key advantages. Here’s why.
Modularity and Scalability
Assembled on site from prefabricated components, bolted steel tanks allow storage capacity to be expanded over time without requiring major reconstruction. As a data center’s power density increases—particularly with the growth of AI-driven workloads—the tank can be adapted to meet evolving needs without the need for significant civil engineering work.
Simplified Maintenance and Operational Continuity
The ability to replace individual panels without affecting the entire structure reduces maintenance costs and minimizes downtime. In environments where availability is critical, this represents a significant advantage.
Controlled Logistics on Constrained Sites
Delivered as kits and assembled on site, these tanks address access constraints in urban and peri-urban locations where traditional civil works can be complex and costly.
APRO Industrie’s bolted steel tanks are available in capacities ranging from 4 m³ to 10,000 m³ and comply with AWWA and NFPA standards. Elevated or modular configurations are often preferred when available ground space is limited.
Water Footprint Reduction
A well-designed tank enables the collection and reuse of process water, reduces reliance on the public water supply, and improves water-use monitoring and reporting. It can also help reduce indirect environmental impacts and support more sustainable water management practices.
Reference Standards
Key standards and regulations include NFPA 22 for fire protection water tanks, AWWA D103 for bolted steel water storage tanks, and applicable local building codes.
In France, the regulatory framework includes the DECI decree, departmental RDDECI regulations, as well as applicable NF and EN standards.
Operational and Investment Recommendations
An effective strategy begins with anticipating requirements during the design phase. Technology choices should be aligned with the specific characteristics of each site and its operational constraints.
Diversifying water sources, including rainwater harvesting and the reuse of treated water helps strengthen system resilience. Implementing monitoring tools and preventive maintenance programs ensures the long-term reliability of the installations.
Engaging insurers early in the process can also help optimize risk management and protect investments.
APRO Industrie Expertise
Since 1987, APRO Industrie has been designing and manufacturing bolted steel tanks for liquid storage. Our teams support the entire project lifecycle from engineering and design, to installation and maintenance, to tailor each solution to the site’s specific requirements, including storage capacity needs, operational autonomy, future scalability, and local regulations (NFPA, AWWA).
With more than 35 years of experience, we support complex projects involving large storage capacities, high-availability requirements, and installations that can be expanded as needs evolve.
FAQ
Worldwide, several countries are seeking to balance digital development with the preservation of natural resources. This transition is driving operators to invest in more water and energy efficient technologies. Water reserves are therefore becoming a strategic asset to ensure service continuity while improving the environmental performance of digital infrastructure.
Why does a data center need a water tank?
To ensure the operation of cooling systems and reduce the risks associated with interruptions to the public water supply, particularly during peak demand periods in warmer seasons.
What capacity should be planned ?
Capacity depends on the site’s water consumption, the required level of autonomy, and the equipment in use. Dual sizing for both fire protection and cooling requirements is recommended from the design phase.
Which cooling systems use water tanks?
Liquid cooling systems, cooling towers, and adiabatic cooling solutions typically require a water tank, with specific requirements in terms of water quality and flow rate.
Why choose a bolted steel tank for a data center?
Its modular design allows capacity to be increased without major construction work. Its prefabricated kit format simplifies installation on complex sites, while maintenance through individual panels reduces downtime. These advantages are essential for critical infrastructure.
How can water consumption be optimized in a data center?
By monitoring consumption in real time, quickly detecting leaks, recycling process water, and optimizing cooling cycles. The integration of a water reuse system (REUT) also helps reduce reliance on municipal water supplies.
Building a data center? Let’s talk about your water storage needs.
APRO Industrie supports you from design through commissioning: sizing, technology selection, installation, and maintenance. Our bolted steel tanks are engineered to meet the requirements of critical infrastructure and fully comply with current fire safety and environmental standards.
Contact our team for a tailored assessment of your water storage needs.
Photo by Chad Davis “Google Data Center, Council Bluffs Iowa” on Flickr.
