Massachusetts boasts a robust water treatment industry focused on ensuring safe and sustainable water environments. This sector comprises companies offering solutions ranging from wastewater management to advanced filtration systems. Innovations such as ceramic membranes and bioenergy treatment technologies are shaping the future of water management. As water scarcity and quality concerns rise globally, anticipated growth is evident, signifying a critical service for industrial users, municipalities, and environmental regulators alike. Enhanced regulations and a push for green technologies further influence the industry's trajectory, making it an essential domain for ongoing investment and sustainability efforts.

The companies listed operate from various locales in Massachusetts, showcasing a mix of expertise and innovation. Ranging from small teams under 50 to larger firms with over a thousand employees, these companies have originated since the 1970s up to 2023. Their specialties include seawater desalination, high purity water systems, and wastewater treatment services. With many private and venture-capital-backed firms, their commitment towards addressing environmental challenges and improving water access is evident.

Continue reading to learn about Massachusetts’ top water treatment companies.

Top 19 Water Treatment Companies in Massachusetts

1. Gradiant

• Website: gradiant.com
• Ownership type: Venture Capital
• Headquarters: Woburn, Massachusetts, United States (USA)
• Employee distribution: India 33%, Singapore 25%, United Arab Emirates 11%, Other 31%
• Latest funding: Series D, $225.0M, May 2023
• Founded year: 2013
• Headcount: 501-1000
• LinkedIn: gradiant-corporation

Gradiant is a water treatment company based in Woburn, Massachusetts, founded in 2013. The company specializes in advanced solutions for industrial water and wastewater management, catering to essential sectors like semiconductors and pharmaceuticals. Gradiant's mission is to tackle global water scarcity by providing innovative technologies that help industries reduce freshwater withdrawal, reclaim valuable resources, and transform wastewater into clean water. Their proprietary technology stack integrates cutting-edge water treatment solutions with customized chemical formulations, all powered by advanced AI to enhance operational efficiency and sustainability. With a workforce of around 601 employees and a significant presence in countries such as India, Singapore, and the UAE, Gradiant is well-positioned to address the critical water challenges faced by industries worldwide. The company recently secured $225 million in Series D funding, underscoring its growth potential and commitment to delivering impactful water solutions.

2. Poseidon Water LLC

• Website: poseidonwater.com
• Ownership type: Private
• Headquarters: Boston, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1995
• Headcount: 11-50
• LinkedIn: poseidon-water-llc

Poseidon Water LLC, founded in 1995 and based in Boston, Massachusetts, is a private company that specializes in seawater desalination and water infrastructure projects. The firm is dedicated to providing innovative solutions to local governments and industrial users facing water scarcity challenges. Poseidon Water's operations include water treatment, wastewater treatment, and water recycling, with a strong emphasis on sustainable practices and environmental responsibility. Their most notable project, the Claude "Bud" Lewis Carlsbad Desalination Plant, has been operational since 2015 and is recognized as the largest seawater desalination facility in the Western Hemisphere. This plant not only supplies a significant amount of drinking water to the San Diego region but also exemplifies Poseidon's commitment to reducing environmental impact, having achieved net-zero carbon emissions. The company actively pursues new opportunities in various market regions, including California, Florida, and Texas, and engages in partnerships that optimize project delivery and risk management.

3. Cambrian

• Website: cambrianinnovation.com
• Ownership type: Private Equity
• Headquarters: Watertown, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $200.0M, November 2023
• Founded year: 2006
• Headcount: 11-50
• LinkedIn: cambrian-innovation

Cambrian Innovation, founded in 2006 and based in Watertown, Massachusetts, is a private equity-backed company that specializes in wastewater treatment. The firm is dedicated to transforming wastewater into renewable energy and clean water through its innovative technologies. Cambrian offers a range of products, including the EcoVolt Reactor, which utilizes bioelectrically-enhanced processes to treat wastewater while generating energy. Their BioViper system integrates multiple treatment zones to improve efficiency and reduce sludge production. Cambrian also provides services such as plant evaluation, optimization, and the Water-Energy Purchase Agreement (WEPA), which allows clients to benefit from wastewater treatment without upfront capital investment. Recently, Cambrian secured $200 million in funding, indicating strong investor confidence in their business model and growth potential. Their focus on sustainability and cost savings makes them a significant player in the water treatment industry.

4. Nanostone Water

• Website: nanostone.com
• Ownership type: Private
• Headquarters: Waltham, Massachusetts, United States (USA)
• Employee distribution: Germany 56%, United States (USA) 11%, India 11%, Other 22%
• Founded year: 2012
• Headcount: 51-200
• LinkedIn: nanostone-water

Nanostone Water, founded in 2012 and based in Waltham, Massachusetts, is a private company that specializes in advanced ceramic membrane technology for water treatment. The firm addresses critical issues such as water scarcity and pollution through innovative solutions tailored for municipal and industrial applications. Their product offerings include systems for municipal drinking water, seawater desalination, and wastewater reuse, among others. With a workforce of approximately 68 employees, Nanostone operates globally, with a significant presence in Germany, where their technology is engineered and produced. The company prides itself on its robust research and development capabilities, ensuring high-quality and reliable filtration solutions. Their commitment to excellence is reflected in their extensive track record of successful projects, serving a range of clients from water utilities to industrial giants. Nanostone Water's ceramic membranes are designed to withstand harsh conditions, providing long-lasting performance and efficiency in water treatment processes.

5. EMCO Group

• Website: emcogroup.com
• Ownership type: Private
• Headquarters: Canton, Massachusetts, United States (USA)
• Employee distribution: Saudi Arabia 27%, Iraq 27%, Lebanon 18%, Other 28%
• Founded year: 1974
• Headcount: 51-200
• LinkedIn: emco-group

EMCO Group, founded in 1974 and based in Canton, Massachusetts, is a private company specializing in water treatment solutions. With a workforce of approximately 74 employees, EMCO has established itself as a provider of engineering, manufacturing, and installation services for water and wastewater treatment systems. The company caters to both municipal and industrial clients, addressing their water management needs effectively. EMCO's portfolio includes a range of services such as desalination, effluent treatment, and the construction of pumping stations. Their operations extend beyond the United States, with significant activities in the Middle East, including countries like Saudi Arabia, Iraq, and Lebanon. This international footprint underscores their capability to handle complex water treatment projects across various regions. EMCO's commitment to quality is reflected in their adherence to ISO standards, ensuring that their solutions meet rigorous safety and environmental requirements.

6. Atlas Watersystems, Inc/H2O Care

• Website: h2ocare.com
• Ownership type: Private
• Headquarters: Waltham, Massachusetts, United States (USA)
• Founded year: 1987
• Headcount: 51-200
• LinkedIn: atlas-watersystems

Atlas Watersystems, Inc/H2O Care, based in Waltham, Massachusetts, has been a significant player in the water treatment industry since its inception in 1987. The company specializes in water filtration and softening solutions, catering to both residential and commercial customers across New England. H2O Care addresses a variety of water quality issues through comprehensive testing, analysis, and the installation of tailored filtration systems. Their team, composed of licensed plumbers and water quality experts, ensures that clients receive professional service and ongoing maintenance to enhance water quality. With over 12,000 satisfied customers, H2O Care has built a reputation for reliability and expertise in tackling regional water problems, including contaminants like iron, manganese, and PFAS. The company does not rely on external funding, which reflects its self-sustaining business model and commitment to quality service.

7. Desalitech, a DuPont brand

• Website: desalitech.com
• Ownership type: Corporate
• Headquarters: Newton, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: December 2019
• Founded year: 2008
• Headcount: 11-50
• LinkedIn: desalitech-ltd

Desalitech, a DuPont brand, is a technology company based in Newton, Massachusetts, specializing in water purification and separation solutions. Founded in 2008, the company has developed a range of products, including advanced filtration systems and membranes, aimed at addressing water scarcity and improving water quality. Desalitech's innovative Closed Circuit Reverse Osmosis (CCRO) technology significantly enhances water recovery rates while minimizing waste, making it a valuable solution for various industries. Their clientele includes municipalities and industrial sectors, reflecting their capability to meet diverse water treatment needs. As part of DuPont Water Solutions, Desalitech benefits from a robust portfolio of technologies and a commitment to sustainability, positioning itself as a key player in the global water management arena.

8. AquaPoint (Advanced Wastewater Treatment)

• Website: aquapoint.com
• Ownership type: Private
• Headquarters: New Bedford, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 89%, Denmark 11%
• Founded year: 1992
• Headcount: 11-50
• LinkedIn: aquapoint

AquaPoint, based in New Bedford, Massachusetts, is a private company established in 1992 that specializes in advanced wastewater treatment systems and services. With a workforce of around 19 employees, AquaPoint caters to various sectors, including commercial, industrial, and municipal markets. The company offers a range of products designed to manage wastewater effectively, such as Bioclere™ and AquaCELL™, which are tailored to meet specific treatment needs like high-strength waste and nutrient removal. AquaPoint also provides comprehensive maintenance and technical support services, ensuring that clients can operate their systems efficiently and in compliance with environmental regulations. Their technology has been validated by reputable organizations, including the EPA and NASA, underscoring their commitment to quality and reliability in wastewater treatment solutions.

9. ZwitterCo

• Website: zwitterco.com
• Ownership type: Venture Capital
• Headquarters: Woburn, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 97%, Canada 3%
• Latest funding: Series B, $58.4M, July 2024
• Founded year: 2018
• Headcount: 51-200
• LinkedIn: zwitterco-inc

ZwitterCo, based in Woburn, Massachusetts, is a water treatment company that specializes in cutting-edge membrane technologies for industrial applications. Founded in 2018, ZwitterCo aims to tackle the pressing challenges of water scarcity and wastewater management through its advanced filtration solutions. Their product offerings include superfiltration and reverse osmosis membranes, which are engineered to perform effectively in high-fouling environments. ZwitterCo serves various industries, such as dairy processing, bioprocessing, and meat and poultry, helping clients improve water reuse and reduce operational costs. The company has gained recognition for its innovative approach, receiving accolades like the 2024 Edison Innovation Award. Recently, ZwitterCo secured $58.4 million in Series B funding, further solidifying its position in the water treatment industry and enabling continued development of its technologies.

10. Walchem, Iwaki America Inc.

• Website: walchem.com
• Ownership type: Private
• Headquarters: Holliston, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 89%, China 11%
• Founded year: 1974
• Headcount: 51-200
• LinkedIn: walchem-corporation

Walchem, Iwaki America Inc., founded in 1974 and based in Holliston, Massachusetts, is a manufacturer dedicated to providing water treatment solutions. The company specializes in a range of products, including controllers, metering pumps, and sensors, which are essential for effective water management. Their offerings are utilized in various industries, such as food and beverage, oil and gas, and wastewater management, showcasing their capability to meet diverse water treatment needs. Walchem emphasizes innovation, integrating advanced technologies in their products to enhance efficiency and reliability. They also provide technical support to ensure customers can effectively manage their water treatment processes. With a workforce of around 28 employees, the company maintains a strong presence in the U.S. market while also having a footprint in China. Their commitment to quality and customer service positions them as a significant player in the water treatment sector.

11. Aqua Laboratories, Inc,

• Website: aqualaboratories.com
• Ownership type: Private
• Headquarters: Amesbury, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1970
• Headcount: 11-50
• LinkedIn: aqua-laboratories-inc-

Aqua Laboratories, Inc. is a water treatment service provider based in Amesbury, Massachusetts, with a history dating back to 1970. The company specializes in innovative water management programs tailored to meet the needs of various industries, including Food & Beverage, Healthcare, Hospitality, and Manufacturing. With a workforce of 11-50 employees, Aqua Laboratories emphasizes optimizing water systems to enhance efficiency and ensure compliance with industry regulations. Their services include water treatment programs for steam boilers, cooling towers, and closed recirculating loops, primarily serving clients throughout New England. The company prides itself on exceptional customer service, offering proactive support and regular evaluations to maintain the effectiveness of their water treatment solutions. Aqua Laboratories has also invested in advanced technologies, such as remote monitoring systems, to enhance their service delivery. They are committed to sustainability and have been recognized for their Green Water Treatment Technology, which was nominated for the Presidential Green Chemistry Award in 2010.

12. Arion Water, Inc.

• Website: arionwater.com
• Ownership type: Private
• Headquarters: Carver, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1985
• Headcount: 11-50
• LinkedIn: arionwater

Arion Water, Inc., established in 1985, specializes in high purity water treatment services. Based in Carver, Massachusetts, the company designs, manufactures, and maintains water systems tailored for clients in the biopharmaceutical, semiconductor, and healthcare industries. With a workforce of 11-50 employees, Arion Water has built a reputation for ensuring that their systems meet rigorous purity standards, which are critical for the operations of their clients. Their services include water system design, preventative maintenance, monitoring, and validation, all aimed at delivering reliable and efficient water purification solutions. Over the years, Arion Water has developed proprietary designs that not only meet but often exceed industry specifications, making them a trusted partner for organizations that depend on high-quality water for their processes.

13. Barclay Water Management, Inc.

• Website: barclaywater.com
• Ownership type: Corporate
• Headquarters: Newton, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 98%, United Kingdom (UK) 2%
• Latest funding: November 2024
• Founded year: 1932
• Headcount: 51-200
• LinkedIn: barclay-water-management-inc-

Barclay Water Management, Inc., based in Newton, Massachusetts, has been a significant player in the water treatment industry since its inception in 1932. The company specializes in environmental hygiene and Legionella risk management, providing a comprehensive suite of services that includes water treatment, cleaning, and disinfection. Their clientele spans various industries, such as healthcare, education, hospitality, and manufacturing, reflecting their ability to cater to different operational needs. Barclay's innovative technologies, like the iChlor® Monochloramine System, enhance the quality of potable water while minimizing the risks associated with harmful pathogens. The company prides itself on its employee ownership model, which fosters a culture of accountability and commitment to service excellence. With a focus on compliance with health regulations and a proactive approach to water management, Barclay Water Management continues to play a crucial role in ensuring safe and efficient water systems across its service areas.

14. S.I.D.E.A. Italia Srl

• Website: sideaitalia.com
• Ownership type: Private
• Headquarters: Scituate, Massachusetts, United States (USA)
• Employee distribution: Italy 100%
• Founded year: 1978
• Headcount: 11-50
• LinkedIn: s-i-d-e-a-italia-srl

S.I.D.E.A. Italia Srl, founded in 1978, is a private company based in Scituate, Massachusetts, specializing in water treatment solutions. The firm manufactures a range of equipment designed to ensure clean and safe drinking water, with a particular focus on their Naturizzatore® technology. This innovative system is aimed at families, restaurants, hotels, and businesses, providing tailored solutions for water purification and treatment. The company prides itself on its commitment to sustainability, as evidenced by its various environmental initiatives and certifications, including ISO 9001 and ISO 22000. S.I.D.E.A. Italia Srl also engages in community-oriented projects, such as the installation of public water fountains, which further underscores its dedication to improving water access and quality. With a workforce of 11-50 employees, the company operates primarily in Italy, maintaining a strong focus on quality and customer satisfaction in its operations.

15. Aqualite US

• Website: aqualiteus.com
• Ownership type: Family Owned
• Headquarters: Tyngsborough, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1991
• Headcount: 11-50
• LinkedIn: aqualite-us

Aqualite US, based in Tyngsborough, Massachusetts, is a family-owned water treatment company that has been serving customers since 1991. The company specializes in providing solutions for clean and safe water, offering a range of products including whole-home water softeners, advanced filtration systems, and comprehensive water testing services. Aqualite US caters to both residential and commercial clients, addressing various water quality issues prevalent in the northeastern United States. Their team is known for its expertise and customer service, which is reflected in their numerous positive testimonials. Aqualite US is also recognized for its commitment to community service and support for military personnel, further enhancing its reputation in the industry.

16. Practical Applications, Inc.

• Website: paih2o.com
• Ownership type: Private
• Headquarters: Woburn, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1993
• Headcount: 11-50
• LinkedIn: practical-applications-inc-

Practical Applications, Inc., founded in 1993 and based in Woburn, Massachusetts, is an engineering consulting firm that specializes in industrial wastewater and pure water systems. The company serves a range of industries, including life sciences, healthcare, education, and food & beverage. Their services include engineering consulting, equipment and systems design, and on-site service and maintenance. Practical Applications is dedicated to optimizing water treatment processes, ensuring regulatory compliance, and minimizing operational risks for their clients. Their team consists of scientists, engineers, and compliance specialists who work collaboratively to develop customized solutions that enhance efficiency and safety in water management. The firm also emphasizes continuous education, offering training programs for wastewater operators and resources for industry professionals.

17. CDM Smith

• Website: cdmsmith.com
• Ownership type: Corporate
• Headquarters: Boston, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 63%, India 13%, Qatar 6%, Other 18%
• Latest funding: March 2024
• Founded year: 1947
• Headcount: 5001-10000
• LinkedIn: cdmsmith

CDM Smith Inc., founded in 1947 and headquartered in Boston, Massachusetts, is an engineering and construction firm that specializes in a variety of sectors, including water treatment. With approximately 7,930 employees, the company provides services such as design, consulting, program management, and construction. CDM Smith is particularly active in addressing pressing water issues, including the management of PFAS and lead in drinking water, as well as promoting water reuse and desalination strategies. Their approach combines technical expertise with a focus on sustainability, helping clients navigate complex environmental challenges. The firm serves both public and private clients, demonstrating a broad reach in the water treatment industry.

18. Atlas High Purity Water

• Website: atlashighpurity.com
• Ownership type: Private
• Headquarters: Canton, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1982
• Headcount: 11-50
• LinkedIn: atlas-high-purity-solutions

Atlas High Purity Water, based in Canton, Massachusetts, has been a prominent service provider in the high purity water systems sector since its founding in 1982. The company specializes in designing, installing, and maintaining systems that meet the rigorous demands of industries such as biotech, pharmaceuticals, healthcare, and semiconductor manufacturing. With a dedicated team of experienced technicians, Atlas High Purity Water ensures that its clients receive expert support and compliance with the highest water quality standards. Their service offerings include reverse osmosis, deionization, filtration, and UV sterilization, among others. The company prides itself on its responsive customer service, providing 24/7 emergency support to critical facilities across the Northeast. Atlas High Purity Water is part of the East Range Group, which enhances its capabilities and resources in delivering high-quality water treatment solutions.

19. Esolve International Limited

• Website: esolveint.com
• Ownership type: Private
• Headquarters: Sharon, Massachusetts, United States (USA)
• Employee distribution: Bangladesh 100%
• Founded year: 2017
• Headcount: 11-50
• LinkedIn: esolve-international-limited

Esolve International Limited, founded in 2017 and based in Sharon, Massachusetts, is a private environmental consulting firm. With a team of 11-50 employees, the company specializes in sustainable infrastructure design and development. Esolve offers a comprehensive suite of services that includes water supply management, wastewater treatment, urban planning, and environmental assessments. Their clientele consists of private developers, industries, and local authorities, all seeking effective solutions to enhance community development while adhering to environmental regulations. Esolve's expertise in designing water distribution networks and wastewater treatment plants positions them as a significant player in the water treatment industry. They have successfully completed various projects, including wastewater management systems and drainage solutions, demonstrating their commitment to improving water quality and infrastructure. Esolve's approach combines innovative thinking with practical applications, making them a relevant entity in the water treatment sector.

Water Treatment Insights: Key Companies in Massachusetts

Company	Headquarter	Size	Founded	Ownership
Gradiant	Woburn, Massachusetts, United States (USA)	501-1000	2013	Venture Capital
Poseidon Water LLC	Boston, Massachusetts, United States (USA)	11-50	1995	Private
Cambrian	Watertown, Massachusetts, United States (USA)	11-50	2006	Private Equity
Nanostone Water	Waltham, Massachusetts, United States (USA)	51-200	2012	Private
EMCO Group	Canton, Massachusetts, United States (USA)	51-200	1974	Private
Atlas Watersystems, Inc/H2O Care	Waltham, Massachusetts, United States (USA)	51-200	1987	Private
Desalitech, a DuPont brand	Newton, Massachusetts, United States (USA)	11-50	2008	Corporate
AquaPoint (Advanced Wastewater Treatment)	New Bedford, Massachusetts, United States (USA)	11-50	1992	Private
ZwitterCo	Woburn, Massachusetts, United States (USA)	51-200	2018	Venture Capital
Walchem, Iwaki America Inc.	Holliston, Massachusetts, United States (USA)	51-200	1974	Private
Aqua Laboratories, Inc,	Amesbury, Massachusetts, United States (USA)	11-50	1970	Private
Arion Water, Inc.	Carver, Massachusetts, United States (USA)	11-50	1985	Private
Barclay Water Management, Inc.	Newton, Massachusetts, United States (USA)	51-200	1932	Corporate
S.I.D.E.A. Italia Srl	Scituate, Massachusetts, United States (USA)	11-50	1978	Private
Aqualite US	Tyngsborough, Massachusetts, United States (USA)	11-50	1991	Family Owned
Practical Applications, Inc.	Woburn, Massachusetts, United States (USA)	11-50	1993	Private
CDM Smith	Boston, Massachusetts, United States (USA)	5001-10000	1947	Corporate
Atlas High Purity Water	Canton, Massachusetts, United States (USA)	11-50	1982	Private
Esolve International Limited	Sharon, Massachusetts, United States (USA)	11-50	2017	Private

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