Power Generation Water Treatment Systems and Equipment - Market Share Analysis, Industry Trends & Statistics, Growth Forecasts (2026-2031)

The power generation water treatment systems and equipment market size was estimated at USD 15.73 billion in 2025 and is estimated to grow from USD 16.54 billion in 2026 to USD 22.05 billion by 2031, at a CAGR of 5.92% during the forecast period (2026-2031). This report is Segmented by Treatment Stage (Cooling Water Treatment and More), Equipment Type (Filtration Systems and More), Plant Type (Coal-Fired Power Plants and More), Project Type (Greenfield Projects and More), Water Source (Freshwater and More), and Geography (Asia-Pacific, North America and More). The Market Forecasts are Provided in Terms of Value (USD).

Global Power Generation Water Treatment Systems and Equipment Market Trends and Insights

Stricter Power-Plant Effluent and Water-Intake Regulation

Regulatory compliance is a central reason utilities are investing in power plant water treatment. The US Environmental Protection Agency issued its Deadline Extensions Rule on December 23, 2025, covering flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate. The rule extended certain zero-discharge compliance deadlines from December 2029 to December 2034, while keeping the underlying technology requirements in place. This defined timetable supports staged procurement rather than rushed end-of-cycle installations. As a result, the power generation water treatment systems and equipment market offers a longer window for utilities to plan treatment upgrades, evaluate technology options, and allocate capital across budget cycles. Operators still need to assess discharge streams, select suitable treatment trains, and demonstrate compliance under the applicable standards.

Water Reuse and Zero Liquid Discharge Adoption in Water-Stressed Regions

Water reuse is becoming a practical operating requirement where dependable freshwater supply is limited. Thermal generators are assessing wastewater as a recoverable input rather than solely a disposal stream. This shift is increasing interest in reuse systems, membrane treatment, evaporation, and crystallization steps within the power generation water treatment systems and equipment market. The need is greatest where plant water demand and local resource pressure occur simultaneously. Reclaimed water often requires extensive pretreatment, as it can carry higher dissolved solids, microbiological loads, and organic matter than conventional make-up water. Suppliers that can manage these feedwater conditions and integrate reuse equipment with plant operations are better positioned for long-term service work.

High Capital and Energy Cost of Advanced Treatment and Zero Liquid Discharge

Zero liquid discharge systems present a significant financial constraint for plant operators. Their capital cost can be two to five times that of conventional end-of-pipe treatment, depending on feedwater salinity and throughput. Thermal brine concentration can require 20 to 60 kWh per cubic meter of water processed, adding to operating costs. These costs slow purchasing decisions in the power generation, water treatment systems, and equipment market, particularly where electricity prices or financing conditions are unfavorable. Waste-heat integration can reduce energy use, but it requires water and power systems to be designed together from the outset. Many operators respond with phased investments that address specific discharge streams first and defer a full zero-liquid-discharge configuration until capital conditions improve.

Other drivers and restraints analyzed in the detailed report include:

• Expansion of High-Pressure, High-Efficiency Steam Cycles
• Aging Treatment Assets and Brownfield Retrofit Demand
• Skilled-Operator and Process-Integration Shortage

Segment Analysis

Boiler Feedwater Treatment accounted for 35.56% of the power generation water treatment systems and equipment market in 2025, reflecting the need for ultra-pure water in steam cycles. High-pressure boilers require close control of silica, conductivity, dissolved oxygen, and corrosion-related contaminants. Treatment trains commonly include clarification, filtration, reverse osmosis, ion exchange, or electrodeionization, depending on source-water quality. These requirements make feedwater treatment a core capital and operating priority for thermal assets. Higher-pressure plants have narrower water-quality limits, which increases the value of reliable final polishing. Feedwater systems also require continuous monitoring because deviations can damage turbines, boilers, and heat-recovery equipment. In October 2025, Toshiba announced that its EtaPRO monitoring system would be deployed across 165 power plants in India. This deployment illustrates how plant owners are linking water-quality monitoring with predictive maintenance and operational control. Cooling Water Treatment and Raw or Make-up Water Treatment remain significant adjacent stages, as cooling circuits have substantial chemical-demand and microbiological-control needs. Reclaimed surface-water supplies can make those requirements more demanding.

Wastewater Treatment, including flue gas desulfurization, ash-pond treatment, zero liquid discharge, and reuse, is projected to expand at a 7.13% CAGR through 2031. This stage is supported by discharge requirements and the commercial value of recovering water for reuse. Systems can include equalization, chemical precipitation, biological treatment, membrane concentration, evaporation, and crystallization. Each stage is selected based on the contaminants in the specific waste stream and the discharge target. Wastewater treatment is increasingly factored into plant planning at an early stage rather than addressed only after a compliance issue emerges. It also creates service opportunities because operating performance depends on chemistry, membrane condition, solids handling, and waste management. Condensate polishing and chemical make-up systems remain specialized parts of the treatment-stage landscape, and their role is important in facilities where condensate return quality directly affects steam-cycle reliability. The power generation water treatment systems and equipment market benefits from this broad treatment-stage mix, as operators must maintain water quality from intake through discharge.

Filtration Systems accounted for 32.67% of the 2025 market, reflecting their role as the first treatment step for nearly every water source. Media filters, pressure sand filters, and disk filters continue to remove suspended solids before downstream treatment. Their installed base in older coal plants creates replacement opportunities when sites reassess their full treatment trains. Filtration also remains relevant for seawater intake, reclaimed-water preparation, and cooling-water circuits, providing a cost-effective barrier against fouling and protecting more sensitive membrane or ion-exchange equipment. Equipment selection depends on the solids profile, flow variability, footprint, and required treatment reliability. In many applications, filtration is not replaced by membranes but combined with them, making the category essential even as more advanced technologies gain use. Suppliers can differentiate through automation, lower backwash demand, and designs suited to constrained retrofit spaces. The category remains an entry point to broader treatment-system sales.

Membrane Systems, including ultrafiltration, microfiltration, reverse osmosis, and nanofiltration, are forecast to grow at a 7.34% CAGR through 2031. Membranes can combine pretreatment, polishing, and demineralization functions in an integrated process and are increasingly used where operators need higher recovery, lower chemical regeneration, or tighter dissolved-solids control. All-membrane designs can use ultrafiltration followed by two-pass reverse osmosis and electrodeionization (EDI) for boiler make-up water, delivering high-purity output suitable for demanding steam-cycle applications. Ion Exchange and EDI Systems remain important final-polishing technologies, particularly for high-pressure boilers. Biological and Thermal Treatment Systems serve specialized wastewater roles where dissolved contaminants or concentrated brine cannot be handled efficiently by membranes alone. Compliance requirements and environmental-management practices are also supporting biological treatment for selenium and nitrogen removal. The equipment mix therefore varies by plant age, water source, discharge limits, and operating profile.

Complete Report Scope:

• By Treatment Stage
  • Cooling Water Treatment
  • Boiler Feedwater Treatment
  • Raw/Make-up Water Treatment
  • Wastewater Treatment (FGD, Ash Pond, ZLD and Reuse)
  • Others
• By Equipment Type
  • Filtration Systems
  • Membrane Systems (UF/MF/RO/NF)
  • Ion Exchange and EDI Systems
  • Biological and Thermal Treatment Systems
  • Others
• By Plant Type
  • Coal-Fired Power Plants
  • Gas and Combined Heat and Power Plants
  • Nuclear Power Plants
  • Renewable Power Plants (Biomass, Waste-to-Energy, Geothermal)
  • Others
• By Project Type
  • Greenfield Projects
  • Brownfield Retrofit Projects
  • Operations and Maintenance Replacement Projects
• By Water Source
  • Freshwater
  • Seawater
  • Municipal Reclaimed Water
• By Geography
  • Asia-Pacific
    • China
    • India
    • Japan
    • South Korea
    • ASEAN Countries
    • Rest of Asia-Pacific
  • North America
    • United States
    • Canada
    • Mexico
  • Europe
    • Germany
    • United Kingdom
    • France
    • Italy
    • NORDIC Countries
    • Russia
    • Rest of Europe
  • South America
    • Brazil
    • Argentina
    • Rest of South America
  • Middle-East and Africa
    • Saudi Arabia
    • South Africa
    • Rest of Middle-East and Africa

Geography Analysis

Asia-Pacific accounted for 40.57% of the power generation water treatment systems and equipment market share in 2025 and is forecast to grow at a 6.95% CAGR through 2031. The region combines new thermal capacity, large existing coal fleets, and freshwater constraints. India and China require both greenfield treatment systems and upgrades for established stations. Advanced steam-cycle projects support demand for high-purity feedwater equipment. Water reuse and zero liquid discharge are increasingly relevant in regions with limited freshwater access.

Toshiba's planned deployment of monitoring systems across Indian plants reflects demand for data-driven plant water management. Japan and South Korea contribute to the demand for high-specification water chemistry and membrane technologies. North America presents high regulatory complexity, as aging coal plants face effluent management requirements. The US Environmental Protection Agency (EPA)'s 2025 rule provides a longer timetable for qualifying steam-electric wastewater compliance activities, giving operators additional time to meet discharge standards. Europe presents a different profile, as coal retirements reduce the need for new fossil-fuel capacity, while compliance upgrades and ongoing operations continue to drive equipment demand.

South America, the Middle-East, and Africa are emerging demand areas where new energy investment and water scarcity occur together. Fluence's Saudi Arabian contract reflects the need for ultra-pure water at combined-cycle projects. In 2025, Veolia announced a SATORP industrial water contract in Saudi Arabia that included treatment technologies and a 30-year operations commitment. These regions offer greenfield opportunities, but face constraints related to financing, project execution, and availability of technical staff.

List of Companies Covered in this Report:

• ALFA LAVAL
• Aquatech
• Doosan Enerbility
• DuPont
• Ecolab Inc.
• GEA Group Aktiengesellschaft
• IDE
• IEI
• Kurita Water Industries Ltd.
• Ovivo Water Inc.
• Pall Corporation
• SUEZ
• Thermax Limited
• Veolia
• WesTech Engineering, LLC
• Xylem

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support