Industry analysts pegged the global water and wastewater market at over $300 billion in 2023. That number spans distribution, monitoring, desalination and purification, and a handful of multinationals dominate it after a half-decade of consolidation. The biggest structural shift arrived in May 2023, when Xylem Inc. absorbed Evoqua Water Technologies in an all-stock deal valued at roughly $7.5 billion. The merger fused Xylem's pump and digital-monitoring portfolio with Evoqua's chemical-treatment chemistry and field-service network, creating a competitor that reaches across nearly every slice of the water cycle.
Veolia Environnement S.A. closed its takeover of Suez S.A. in January 2022 after a bitter fight. To appease regulators, Veolia later offloaded pieces of Suez to a consortium backed by Meridiam, Global Infrastructure Partners and Caisse des Dépôts et Consignations. The result: two European titans and one large American player now hold a commanding share of global public-utility and factory-side contracts. Pentair plc split its filtration unit from its electrical division in 2018, spinning the latter into nVent Electric plc, and continues to sell into residential and light-commercial filtration.
Who the Dominant Multinationals Are and What They Sell
The three revenue leaders
Xylem, Veolia and Ecolab Inc. are the three largest publicly reporting water-technology companies by revenue. Ecolab posted annual sales above $14 billion in 2022, much of it from process chemistry and water-management services for food plants, refineries and hotels. Xylem's post-Evoqua top line was not disclosed in the brief, but the combined entity fields a wide portfolio: pumps, aeration gear, analytical instruments and digital platforms for leak detection and asset management. Veolia operates across water and waste, with municipal drinking-water and sewage contracts in dozens of countries and a growing factory-services division.
Where they compete
The primary technology categories are advanced filtration and membranes, chemical dosing, desalination, digital water management and leak detection. DuPont bought the Desalitech membrane business in 2020, adding closed-circuit reverse osmosis for industrial and municipal desalination. Pentair concentrates on residential and light-commercial filtration. The big players sell integrated packages; smaller firms specialize in a single layer, such as membranes or sensors.
Municipal Versus Industrial Demand
Public utilities: slow, steady, enormous
City water utilities remain the largest customer segment, propelled by crumbling infrastructure and tightening rules. In the United States alone, the EPA estimates that hundreds of billions of dollars are needed over the next decade to replace lead service lines, modernize plants and manage stormwater. That money flows to companies that supply large-scale purification trains, pumps and monitoring networks.
Factories: faster growth, higher appetite for risk
Industrial customers are the faster-growing segment. Manufacturers, power stations and oil-and-gas operators face stiffer discharge limits and growing water scarcity, which forces investment in on-site recycling and closed-loop processes. Ecolab's model is built almost entirely on factory and commercial clients, providing chemical dosing and digital monitoring to cut water consumption and stay compliant. Gradiant, a water-technology startup that hit unicorn status above $1 billion in 2023, targets advanced desalination and industrial wastewater for semiconductor fabs and textile mills. The divergence matters: municipal contracts are long-term and stable but slow to adopt new methods; industrial buyers will pay for novel solutions that shrink operating costs or avert penalties.
How Mergers and Acquisitions Reshaped the Sector
The two megadeals
The Xylem-Evoqua and Veolia-Suez transactions are the largest water-tech deals of the past five years. Together they concentrated market power in municipal services and outsourced operations. The Xylem-Evoqua tie-up stood out because it married a hardware-and-digital company with a chemical-and-field-service one. The Veolia-Suez acquisition handed Veolia control of Suez's French and international public-works contracts, though the asset sales to Meridiam, GIP and CDC carved out a smaller rival to satisfy antitrust authorities.
A membrane bolt-on and a split
DuPont's 2020 purchase of the Desalitech membrane business was smaller but strategically sharp. Desalitech had engineered closed-circuit reverse osmosis that lifted recovery rates and cut brine volume, a headache for inland desalination plants. By folding that technology into its own membrane portfolio, DuPont strengthened its hand against Toray and Hydranautics. Pentair's 2018 separation was a divestiture, not a merger, but it let the water business focus on filtration without the distraction of an electrical-enclosures division.
PFAS, Emerging Contaminants and the Startup Ecosystem
The PFAS spending wave
PFAS contamination has become a major technology-investment driver. The EPA's proposed drinking-water standards, if finalized, would compel thousands of utilities to install remediation systems. The large companies are responding with granular activated carbon, ion-exchange resins and high-pressure membranes. Veolia and Xylem both sell PFAS solutions; Ecolab has developed testing and treatment services for industrial clients. The economics remain murky: no single method removes every PFAS compound cost-effectively, and liability for disposing of spent media is unresolved.
Startups: real money, limited reach
Venture-backed startups have entered the sector in greater numbers over the past five years, but their commercial footprint remains tiny next to the incumbents. Gradiant is the most prominent example, reaching a billion-dollar valuation by selling advanced desalination and wastewater systems to industrial customers in Asia and the Middle East. Other startups focus on digital monitoring, acoustic leak detection and biological processes. As of May 2024, no startup had achieved the scale or revenue of a mid-tier public water company. But the venture pipeline is active, and several have won contracts with major cities and factory operators.
Key Facts
- Market size (2023): Over $300 billion (global water and wastewater treatment)
- Largest M&A deal: Xylem acquires Evoqua, May 2023, $7.5 billion all-stock
- Veolia-Suez: Completed January 2022, assets sold to Meridiam/GIP/CDC
- Ecolab annual sales (2022): Over $14 billion
- Gradiant valuation (2023): Over $1 billion (unicorn)
- Pentair separation: Water and electrical split in 2018; electrical became nVent
Major Water Technology Companies and Their Focus Areas
| Company | Primary Segments | Key Technology Areas | Notable Event |
|---|---|---|---|
| Xylem Inc. | Municipal, industrial | Pumps, aeration, digital monitoring, leak detection | Acquired Evoqua (2023) |
| Veolia Environnement | Municipal, industrial | Treatment, desalination, contract operations | Acquired Suez (2022) |
| Ecolab Inc. | Industrial, commercial | Chemical treatment, process optimization, digital services | Revenue >$14B (2022) |
| Pentair plc | Residential, commercial, industrial | Filtration, membranes, valves | Separated from nVent (2018) |
| DuPont Water Solutions | Municipal, industrial | Reverse osmosis membranes, ion exchange | Acquired Desalitech membrane business (2020) |
| Gradiant | Industrial | Advanced desalination, wastewater treatment | Unicorn valuation (2023) |
Frequently Asked Questions
Which is the largest water technology company?
No single company dominates the entire sector. Xylem, Veolia and Ecolab are the three largest publicly reporting firms by revenue, but each has a different mix of municipal, industrial and residential business.
How are companies addressing PFAS contamination?
The main technologies are granular activated carbon, ion exchange resins and high-pressure membrane systems. Veolia, Xylem and Ecolab all offer PFAS treatment solutions for municipal and industrial customers.
Are startups a threat to the large water companies?
Not yet. Startups such as Gradiant have achieved billion-dollar valuations and won industrial contracts, but their revenue remains small compared to incumbents. Their main effect so far has been to push larger firms to acquire or partner for novel technology.
