What Are the Best Water Treatment Companies for EPC Projects?

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Investment in water treatment systems may help you to achieve a number of goals, like expanding water infrastructure; conserving water, energy, or other resources; or achieving compliance with environmental regulations. Whatever your goals may be, here at SAMCO, we understand that water and wastewater treatment is critical to the efficiency and overall success of your everyday process.

But as essential as they may be, water and wastewater treatment systems are mechanically and chemically complex, meaning that you’ll need to rely on a trusted expert to ensure that you’re procuring the best possible solution for your needs. To help you navigate a complex and crowded field, we’ve compiled a list of the best water treatment companies, along with a description of the services that they offer.  

What is an EPC project?

Before we dig into our list of top water treatment companies, let’s talk about project delivery models—specifically EPC projects. EPC contracts (short for Engineering, Procurement, Construction) are popular because they allow buyers to offload more of the burden and risk of a capital projects onto a contractor. An EPC project allows a buyer to contract with a single entity, such as an EPC firm that specializes in large capital projects, or directly with a well-equipped water treatment company. In most cases, the owner provides only minimal specifications (e.g. water quality, flow rate, maintenance cost limits, etc.) and the contractor handles everything else to deliver a turnkey facility.

Design-Build (DB) contracts are similar, but the owner takes on more responsibility in developing a conceptual plan before soliciting bids from joint ventures of architects, engineers and builders.  Yet another project delivery model is Design-Bid-Build (DBB), where the owner works with an architect or engineer to put together detailed specifications and blueprints before bidding out the project to a builder.

The advantage of an EPC contract over other delivery models is that the buyer has a single point of responsibility for the duration of the project. That means the buyer gets fixed pricing, and a firm completion schedule, with the contractor assuming a greater share of risk. While EPC projects tend to be more costly than other delivery models, these benefits can well justify the cost depending upon the buyer’s priorities.

No matter whether you’re pursuing an EPC, DB, DBB or other project delivery model, be sure to evaluate your contractor(s) carefully to confirm whether they offer all of the services you might need. The below list reflects a selection of top water treatment companies who either offer a full roster of EPC services, or who have an established history of working with EPC firms as a subcontractor:


Who they are

Aquatech is a US-based water treatment equipment and technologies company that specializes in desalination, water recycle/reuse, and zero liquid discharge (ZLD) for a wide range of industries worldwide. They have been in business for over 40 years, and they share a partnership with Nalco, another well-known water and process services company.

What they offer

Aquatech provides a number of services designed to allow customers to outsource their water and wastewater treatment needs. Aquatech’s products include a range of packaged and modularized water treatment systems, with a particular focus on thermal, membrane and ion exchange technologies, as well as biological wastewater treatment systems. Aquatech makes its water treatment systems available through purchase agreements, leasing agreements, and water treatment-as-a-service models. The company also offers aftermarket parts and consumables services as well. 

Additionally, through its partnership with Nalco, Aquatech offers total water management services, which resemble DB or EPC delivery models in scope and include project management, design, engineering, installation, and operations and maintenance services.

Evoqua Water Technologies

Who they are

Evoqua Water Technologies is a water treatment company that is headquartered in the US and has locations across the globe. It serves municipal, industrial, and recreational clients worldwide. Focused on addressing sustainability and emerging water concerns, Evoqua designs water treatment solutions to help clients maintain environmental regulatory compliance, meet water quality standards, and improve water usage efficiency.

What they offer

Evoqua Water Technologies offers fully-integrated systems and components for specialized separation and high purity water treatment, as well as aerobic and anaerobic wastewater treatment applications. Its product catalog includes some proprietary technologies, particularly for odor and corrosion control in municipal wastewater applications.

Evoqua’s service offerings include sale of full systems and system components, mobile equipment rentals, maintenance service contracts, and digital water monitoring services, as well as build-own-operate (BOO) contracts for municipal clients. While Evoqua does not offer EPC services itself, it does have an established history of working with major EPC firms to build water treatment systems to specification.


Who they are

Founded in 1993, Lenntech Water Treatment Solutions is headquartered in the Netherlands and serves clients across the globe. They specialize in the design and manufacture of water treatment and liquid separation systems for industrial applications, and offer experience in the agriculture, food and beverage, microelectronics, mining, oil and gas, power generation, paper and pulp, and tourism industries.

What they offer

Lenntech designs and manufactures turnkey and custom water treatment systems, and carries a variety of system components and consumables with an emphasis on water purification and membrane separation. For clients interested in building a custom solution, Lenntech provides full-cycle services, including consulting, field and laboratory testing, analysis, solution design, implementation, and training. Additionally, Lenntech offers rental units, spare parts, and maintenance services.

Nalco Water

Who they are

Nalco Water (previously Nalco Company) is a US-based company that was founded in 1928 with the merger of two earlier companies focused on providing water treatment systems for steam engines and boiler applications. Since 2011, Nalco has functioned as a wholly-owned subsidiary of Ecolab Inc., a US-based company that specializes in water treatment and hygiene solutions with a focus on water conservation and sustainability. Over its long history, Nalco’s expertise has grown to cover a wide range of industries and applications, including water recycling/reuse, raw water treatment, specialized process water treatment, cooling tower water treatment, and boiler feedwater treatment, to name just a few.

What they offer

Nalco builds custom water and wastewater treatment solutions to meet customer needs, drawing from its extensive catalog of water and wastewater treatment technologies, including membrane filtration, clarifiers, reverse osmosis (RO)ion exchange (IX), physical/chemical separation, and conventional and biological wastewater treatment systems, among others. Through its parent company, Ecolab, and its network of subsidiaries and partners, Nalco provides a full range of diagnostic and consulting services, predictive modeling services, engineering services, and managed operations services.

Additionally, Nalco offers certain proprietary technologies to enhance system performance, including its ECOLAB3D™ IIoT platform for cloud-based data tracking and analysis, as well as its 3D TRASAR™ technology, which provides real-time monitoring and alerts to protect equipment against issues like corrosion, scaling, and fouling. 


Veolia Water

Who they are

Veolia Water is a division of Veolia Environnement, a large French transnational company with roots that date back over 150 years. As of 2022, Veolia acquired SUEZ Water Technologies, another well-known water solutions provider. Veolia specializes in water and wastewater treatment systems for municipal and industrial customers. The company prioritizes environmental sustainability in its solutions, and has expertise in water reuse, ZLD, energy recovery from sludge, and desalination.

What they offer

Veolia designs and delivers fully-integrated water and wastewater treatment plants as well as smaller component systems. The company offers a comprehensive range of services to support its custom solutions, including consulting, analysis, solution design, implementation, training, auditing, ongoing digital monitoring and maintenance services, mobile equipment rentals, and chemical management programs.

Veolia’s systems incorporate a variety of water treatment technologies, such as adsorption, clarification, biofiltration, membrane filtration, IX, RO, and physical-chemical treatment. Their product catalog includes many trademarked technologies as well, such as their Hydrex™ 1000 series of additive chemicals, Actiflo™ clarifier systems, and the Biobed™ and Biosaf™ wastewater treatment systems.


Who they are

WesTech Engineering is a US-based process equipment engineering and manufacturing company that was established in 1973. Focused on improving water quality and sustainability, WesTech designs, builds, and operates integrated water and wastewater treatment systems for industrial, mineral, and municipal markets worldwide.

What they offer

WesTech designs and delivers water treatment systems that range in scope from large capital projects to smaller-scale packaged systems to retrofits and upgrades. Their product catalog features a comprehensive selection of water treatment technologies, including clarifiers, biological reactors, aerators, EDI systems, membrane and media filtration units, and more.

WesTech offer a comprehensive range of services, including laboratory and pilot testing, engineering, design, construction, startup, mobile equipment rentals, and full-service plant operations and maintenance support. As such, WesTech offers turnkey EPC water treatment solutions itself as a single-source provider, and also has experience working with top EPC contractors on major projects.  


Who they are

Xylem Inc. is a US-based water systems provider that conducts business in over 150 countries. Founded in 2011 as a spinoff of the much older ITT Corporation, Xylem serves a diverse client base of municipalities, residential and building services companies, industrial facilities, and agricultural operations. Its mission is focused on solving water scarcity challenges by developing technologies and systems to make more efficient use of water resources.

What they offer

Xylem’s service offerings span system design, pilot testing, startup, custom fabrication, training, inspection, auditing, monitoring, and operations and maintenance support, allowing them to function as a single-source provider of water and wastewater treatment systems. Xylem maintains a catalog of water treatment technologies for membrane filtration, clarification, disinfection, biological treatment and sludge management, along with parts and supply services. They also offer packaged pump systems for small- or large-scale applications.

SAMCO Technologies

Who we are

SAMCO Technologies is a US-based provider of industrial water treatment, wastewater treatment, and process purification systems. Founded in 1998 with a mission to provide concept-to-completion solutions for industrial clients, SAMCO was established to complement its associated business, regional equipment supplier and systems servicer CS Kimeric. Today, SAMCO’s model remains focused on providing everything under one roof in order to efficiently deliver custom systems at a competitive cost, and with minimal risk.  

What we offer

SAMCO provides a comprehensive range of design and delivery services, both direct to the client, and in collaboration with major EPC firms. Our service offerings include: 

SAMCO leverages these services to create custom water treatment or wastewater treatment systems for industrial, municipal, or commercial applications varying in scope and scale. To learn more about our innovative solutions, check out our project archive for examples of past projects. 

What now?

If you’re looking for a water treatment solution, we hope that this list of the top water and wastewater treatment companies for EPC contracts and other full-service project delivery models has hopefully made it a little easier to navigate your options. After all, getting a handle on what’s out there is an important early step in the planning process. At SAMCO, we also recognize that every project has its unique challenges and objectives, so we invite you to contact us to get in touch with an engineer who can help you to better evaluate solutions for your specific water treatment needs. 

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