On this page
- Why Data Centers Need Water Reuse
- The Treatment Challenge: Reuse Water Is Chemically Complex
- Where Ozone Fits in Data Center Reuse
- Why Ozone Is Not Just a Chemical Feed Point
- A Practical Treatment Train for Data Center Reuse
- Why This Matters for the AI Economy
- The Pinnacle Engineering Perspective
- Conclusion
The rapid expansion of artificial intelligence infrastructure is changing how communities think about water. Data centers are no longer just an electricity planning issue. They are now a water planning issue.
A new bipartisan proposal, the Advancing Water Reuse Act, would create a 30 percent investment tax credit for qualifying water reuse projects at industrial facilities, including data centers, food processing, and manufacturing sites. The bill is intended to reduce freshwater demand by encouraging onsite recycling systems and partnerships with municipal recycled water programs.
At the same time, EPA’s Water Reuse Action Plan 2.0 specifically identifies recycled water for industrial and data center cooling applications as a priority area, with EPA planning to help states and regulated communities share best practices for permitting and implementation.
For treatment engineers, this is a clear signal: data center water reuse is moving from sustainability discussion to infrastructure design.
At Pinnacle Ozone Solutions, we view this as an engineering challenge that requires more than filtration or chemical dosing. Reliable reuse for data center cooling demands control of organics, biofilm, ammonia, metals, odor, microbial growth, and scaling risk. Ozone can play a central role in that treatment train when it is properly designed, controlled, and integrated.
Why Data Centers Need Water Reuse
Many data centers use water for evaporative cooling, humidification, cooling tower makeup, and heat rejection. As AI computing demand grows, data center clusters can place significant stress on local water systems, especially during hot weather when cooling demand and municipal demand peak at the same time.
Recent research on U.S. data center water demand estimates that, if 2024 water-use intensity persists, data centers could require 697 to 1,451 million gallons per day of new water capacity through 2030, a range comparable to New York City’s average daily water supply. The same study notes that these demands are highly concentrated in communities hosting data center development.
This is why water reuse is becoming strategically important. Recycled water can reduce the demand for potable water, but it must be treated to a quality that protects cooling infrastructure and maintains reliable operation.
The Treatment Challenge: Reuse Water Is Chemically Complex
Data center cooling systems are sensitive to water quality. Reuse water may come from municipal reclaimed water, onsite graywater, treated industrial wastewater, stormwater, or blended sources. These sources often contain constituents that can destabilize cooling systems.
Common concerns include:
- dissolved organic carbon
- ammonia and nitrite
- biological growth potential
- iron and manganese
- hydrogen sulfide and odor compounds
- hardness and alkalinity
- silica and scaling minerals
- suspended solids
- trace industrial organics
A reuse system that only meets basic water quality limits may still create operational problems inside a cooling loop.
The goal is not simply to make water reusable. The goal is to make it stable, predictable, and compatible with cooling equipment.
Where Ozone Fits in Data Center Reuse
Ozone is a powerful oxidant that can support reuse treatment in several ways.
Biofilm and Microbial Control
Cooling systems are vulnerable to microbial growth because they provide warm water, nutrients, oxygen, and surface area. Biofilm reduces heat transfer efficiency, increases corrosion risk, and can create conditions favorable for organisms such as Legionella.
Ozone attacks microorganisms by oxidizing cell walls, membranes, and intracellular components. Unlike many chemical biocides, ozone decomposes back to oxygen and does not leave a persistent chemical residual.
In cooling reuse applications, ozone can help:
- reduce biofilm formation
- lower biological activity in recirculating loops
- reduce dependence on conventional biocides
- improve heat exchanger cleanliness
This is especially valuable when reuse water contains biodegradable organic carbon that can feed microbial growth.
Oxidation of Organics and Color
Reclaimed water often contains dissolved organics that contribute to color, odor, fouling, and downstream biological activity.
Ozone reacts with many organic compounds through direct molecular oxidation and through secondary radical pathways. This can break larger, more complex molecules into smaller, more biodegradable fractions.
For data center reuse, this matters because organics can:
- increase biological growth potential
- foul filtration or membrane systems
- increase disinfectant demand
- contribute to odor or color concerns
Ozone can reduce this burden before the water enters polishing steps such as filtration, biological activated carbon, ultrafiltration, or membrane treatment.
Ammonia, Nitrite, and Reduced Compounds
Reuse waters may contain ammonia, nitrite, sulfide, or other reduced species that consume oxidants and affect system stability.
Ozone can oxidize several of these compounds directly or indirectly, depending on pH, dose, and contact time.
Examples include:
NO₂⁻ + O₃ → NO₃⁻ + O₂
H₂S + O₃ → S⁰ + O₂ + H₂O
With sufficient oxidation, reduced compounds are converted into more stable forms, reducing odor, corrosion potential, and downstream oxygen demand.
Iron and Manganese Control
Iron and manganese can enter reuse systems through source water, pipe corrosion, or groundwater blending. In cooling systems, these metals can cause deposits, staining, fouling, and under-deposit corrosion.
Ozone rapidly oxidizes soluble metals into filterable particulates:
Fe²⁺ + O₃ + H₂O → Fe(OH)₃(s) + O₂
Mn²⁺ + O₃ → MnO₂(s) + O₂
Once oxidized, the solids must be removed through filtration. Ozone is not a standalone solids removal process. It is the oxidation step that makes downstream removal possible.
Why Ozone Is Not Just a Chemical Feed Point
Data center reuse systems require stable operation. That means ozone must be engineered as part of a complete treatment system, not simply injected into a pipe.
Key design variables include:
Ozone Dose
Dose must be based on actual oxidant demand, not a generic rule of thumb. Reuse water quality can shift with season, upstream wastewater operations, storm events, and industrial contributions.
Mass Transfer Efficiency
Ozone must dissolve before it can react. Poor gas-liquid transfer wastes energy and increases off-gas load. High-efficiency sidestream injection and pressurized contactors can significantly improve ozone utilization.
Contact Time
Oxidation and disinfection performance depend on CT, the product of dissolved ozone concentration and effective contact time. Reactor hydraulics, T10 behavior, and flow variability must be considered.
ORP and Dissolved Ozone Monitoring
ORP is useful for monitoring the oxidative environment, but it is not the same as dissolved ozone. Data center reuse systems should use appropriate instrumentation based on the treatment objective.
Materials Compatibility
Ozone systems must use compatible materials such as 316L stainless steel, PTFE, PVDF, and ozone-rated elastomers. Reuse water chemistry, chloride levels, pH, and temperature must also be considered.
A Practical Treatment Train for Data Center Reuse
A technically sound reuse system for data center cooling may include:
- Screening or primary filtration
- Ozone oxidation for organics, odor, metals, and microbial control
- Media filtration or ultrafiltration
- Biological activated carbon or GAC polishing
- Scale control and pH stabilization
- Cooling tower makeup or closed-loop reuse
- Continuous monitoring for conductivity, ORP, dissolved ozone, turbidity, and microbial indicators
The exact design depends on the source water and cooling system requirements. Reclaimed municipal water requires a different approach than onsite graywater or industrial reuse.
Why This Matters for the AI Economy
The Advancing Water Reuse Act is important because it recognizes that industrial growth and water security are now linked. The bill specifically covers projects that install or expand onsite water recycling systems at industrial entities, including data centers, and encourages partnerships with municipal recycled water systems.
EPA’s WRAP 2.0 also places data center cooling within the national reuse conversation, showing that water reuse is becoming part of technology infrastructure planning, not just municipal planning.
For communities, this means data center growth must be paired with responsible water management.
For operators, it means cooling water must be treated as a critical utility.
For engineers, it means treatment trains must be designed for reliability, efficiency, and adaptability.
The Pinnacle Engineering Perspective
At Pinnacle Ozone Solutions, we see ozone as a key enabling technology for data center water reuse, but only when it is engineered correctly.
A successful ozone system must account for:
- source water variability
- organic and biological loading
- scaling and corrosion risk
- ozone demand and decay
- CT requirements
- mass transfer efficiency
- downstream filtration and polishing
The objective is not simply to add ozone. The objective is to create a controlled oxidation environment that makes reuse water stable and suitable for high-reliability cooling infrastructure.
Conclusion
The AI infrastructure boom is forcing a new conversation about water.
Data centers need reliable cooling. Communities need protected freshwater supplies. Regulators and policymakers are beginning to support reuse infrastructure that can serve both goals.
Ozone can play a critical role in this transition by helping control biofilm, organics, reduced compounds, metals, and microbial risks in reuse water.
As water reuse becomes central to data center development, treatment systems must be engineered with the same precision as the servers they support.
At Pinnacle Ozone Solutions, we design ozone systems for that level of reliability.
