2026 Water Treatment Market in a Glance

The water sector’s investment needs exceeded USD 1.37T globally in 2022, and spending must increase sixfold to meet SDG 6 by 2030. Public capital is catalyzing near-term demand: the US EPA announced USD 11.5B+ in 2024 SRF funding for drinking water and wastewater upgrades, while federal estimates put USD 630B in clean water needs over the next 20 years.

According to our data, the industry growth is seeing a small decline of 0.74%, and the sector has 1601 startups. For example, Clewas enables AI-powered reverse osmosis optimization and Aquaphys makes a water disinfection reactor.

Global Water Treatment Today: Infrastructure Gaps and Regional Pressure Points

The WHO/UNICEF Joint Monitoring Programme reports that in 2022, 2.2 billion people still lacked safely managed drinking water, including 115 million who relied on surface water. WHO’s WASH monitoring notes that the JMP estimate for 2022 is that 43% of the world’s population (3.5 billion people) lacked safely managed sanitation services. This is a direct demand driver for municipal water treatment upgrades and decentralized treatment solutions.

Moreover, the UN World Water Development Report’s 2024 statistics highlight that none of the SDG 6 targets appear to be on track.

 

 

However, the industry is expected to reach USD 632.9 billion by 2035.

Wastewater treatment currently accounts for over 40% of the global water treatment market, while the commercial end-user segment holds more than 60% of the total market share.

Key global hubs include the USA, India, the UK, Australia, and Canada, while Dubai, Mumbai, London, Pune, and Houston emerge as high-density urban centers for innovation, deployment, and research in water treatment technologies.

 

 

How Startups Are Solving Compliance and Cost Challenges in Water

Clewas offers AI-powered Reverse Osmosis Optimization

Turkish startup Clewas develops AI-powered optimization software for ultrafiltration (UF) and reverse osmosis (RO) systems.

It analyzes real-time plant data to fine-tune setpoints, adjust backwash and operation cycles, and optimize chemical usage. This ensures that energy consumption and antiscalant dosing remain efficient under changing conditions.

Further, the software predicts cleaning needs through data-driven clean-in-place (CIP) scheduling to allow operators to plan maintenance proactively and avoid unexpected downtime.

Thus, it lowers operating costs while improving performance and extending membrane lifespan.

Aquaphys builds a UVC LED Water Disinfection Reactor

French startup Aquaphys offers a non-chemical water treatment reactor that enhances water quality, prevents infrastructure degradation, and improves energy efficiency.

This ultraviolet-C light-emitting diode (UVC LED) reactor disinfects water by generating vortex-enhanced exposure.

It allows the UV-C light to neutralize bacteria, viruses, and other pathogens within seconds without introducing chemicals or mercury-based lamps. Also, it stabilizes heating and cooling networks through hydrodynamic reactors.

Thus, the reactor precipitates limescale into a non-adherent form, dissolves existing deposits, and uses sacrificial zinc anodes to limit corrosion while degassing improves circuit flow.

It also treats domestic hot and cold water by filtering particulates, mitigating microbial growth, preventing scaling, and reducing water aggressiveness, without maintenance.

CIMICO develops a Wastewater Biological Treatment

Spanish startup CIMICO develops a biological wastewater treatment that combines reactor design with digital control to improve purification performance while lowering energy and operational costs.

It applies moving-bed and integrated fixed-film systems to remove organic matter, nitrogen, and phosphorus across municipal and industrial plants. To do this, it uses proprietary carriers and optimized hydraulics and enhances biomass activity in compact footprints.

It strengthens treatment reliability through a digital platform that integrates real-time monitoring, automated process control, and digital-twin simulation to maintain regulatory compliance and anticipate changes in influent quality.

Moreover, it supports operators with mathematical modeling that accurately predicts plant behavior and enables precise sizing, efficient aeration strategies, and reduced sludge handling.

METzero Technologies provides Waste to Resource

UK-based startup METzero Technologies uses the microbial electrolysis technology that treats wastewater with electrogenic bacteria to reduce energy use, increase plant capacity, and recover valuable resources.

It replaces aeration with anaerobic microbial digestion to allow bacteria to break down organic waste while transferring electrons into an electrical circuit.

Then, it applies a controlled voltage across the electrodes to drive the formation of high-value products, such as hydrogen, ammonia, and nitrogen compounds, directly at the cathode.

It integrates this process into modular units that retrofit existing facilities or operate as standalone systems.

AlgaFilm Technologies offers an Algae Biofilm Treatment

Canadian startup AlgaFilm Technologies develops an Algae Forest system that uses sun energy, CO2 from the air, and nutrients in wastewater to produce algae biomass while removing nitrogen, phosphorus, and biochemical oxygen demand (BOD).

The technology grows algae on stationary biofilm carriers that provide a large surface area, stable process conditions, and efficient light use. Likewise, the biofilm architecture enables continuous nutrient uptake and direct CO2 capture.

The system treats municipal and industrial wastewater flows, recovers nutrients, and generates concentrated algae suitable for fertilizers, biofuels, and biomaterials.

From PFAS to Energy Recovery: Where Water Treatment Innovation Is Focused

With 794 300 patents filed by 286 500 applicants, the industry demonstrates broad engagement in improving treatment efficiency, developing next-generation purification materials, and enhancing system automation. A 3.82% yearly patent growth rate indicates continued expansion of technical capabilities across the value chain.

Discover the emerging trends in the water treatment market along with their firmographic details:

The wastewater treatment domain is supported by 20 195+ companies and a workforce of 2.3 million employees. Although it added 403 new roles last year, the -37.62% growth rate over the past five years indicates a market adjusting to regulatory shifts, energy costs, and infrastructure modernization demands.

The zero-liquid discharge segment eliminates wastewater discharge and maximizes resource recovery. With 791 companies and 123 800 employees, this domain reflects growing interest in water sustainability and circular resource use. The addition of 16 new roles in the last 5 years shows targeted expansion. However, the -92.17% trend contraction highlights commercial barriers, including high operational costs and technological complexity.

Reverse osmosis aids in desalination and advanced purification systems. The domain is driven by 6630+ companies employing 410 700 people, with 82 new hires added in the past year as demand for high-efficiency membrane technologies grows. The -69.82% five-year decline rate reflects cost pressures, energy intensity, and competition from emerging treatment technologies.

Strategic Capital in Water: Utilities, Industrials & Long-Horizon Funds

The investment landscape in the water treatment sector reflects steady financial commitment, supported by an average investment value of USD 49.4 million per round.

Investor participation remains broad, with more than 6945+ investors active across the ecosystem, which range from industrial players to climate-focused funds and institutional backers.

In terms of investment, the private sector contributes over 45% of the market. Looking ahead, the zero-liquid discharge segment is projected to grow with a 9.16% CAGR during the forecast period till 2035.

The industry has recorded over 10 200 funding rounds, and more than 4315 firms have secured investment.

The combined value invested by the top investors exceeds USD 7.55 billion.

 

The World Bank’s Global Water Security & Sanitation Partnership annual report states that today global investment needs in the water sector exceed USD 1.37 trillion, and that to meet SDG 6 by 2030, investments must increase sixfold from the current level. For corporate and innovation leaders, this quantifies why utilities are prioritizing lower-OPEX treatment technologies, asset optimization, and financing-ready solutions rather than incremental upgrades alone.

More than USD 630 billion is needed to repair and replace clean water and wastewater infrastructure nationwide over the next 20 years in the US alone. As a result, utilities face a long-run replacement cycle that will increasingly favor modular upgrades, digitized asset management, and performance-linked financing.

Data Sources and Scope

This water management industry outlook is based on insights from the StartUs Insights Discovery Platform to examine 9M+ companies and 25K+ technologies and trends, together with funding activity and infrastructure-level market signals. The analysis focuses on digital water platforms, advanced treatment and reuse systems, leakage detection, energy-efficient operations, and data-driven asset management rather than conventional utility practices. It tracks how water scarcity, regulatory pressure, and aging infrastructure are accelerating the commercialization and scaling of intelligent water management solutions across municipal, industrial, and agricultural applications.