The water treatment industry in Illinois focuses on solutions for improving water quality for both municipal and industrial sectors. Companies in this field cover a wide range, from filtration and purification technologies to chemical manufacturing aimed at addressing environmental challenges like PFAS contamination. As regulations tighten and demand for cleaner water rises, firms are innovating towards eco-friendly practices. Notably, the industry is seeing a shift towards sustainable water management strategies, highlighting the importance of both safety and efficiency in treatment processes.

This list features 20 water treatment companies based in Illinois, varying in size from small firms to major corporations. Established between 1915 and 2016, these companies are headquartered in diverse locations such as Loves Park, Lincolnshire, and Evanston. Their specializations cover everything from advanced filtration systems and water management consulting to chemical solutions for wastewater treatment. Many emphasize sustainability and innovative approaches, addressing the evolving needs of the water treatment market.

Read on to discover more about Illinois' top water treatment companies.

Top 20 Water Treatment Companies in Illinois

1. Aqua-Aerobic Systems, Inc.

• Website: aqua-aerobic.com
• Ownership type: Corporate
• Headquarters: Loves Park, Illinois, United States (USA)
• Employee distribution: United States (USA) 98%, Other 2%
• Latest funding: January 2016
• Founded year: 1969
• Headcount: 51-200
• LinkedIn: aqua-aerobic-systems-inc-

Aqua-Aerobic Systems, Inc., based in Loves Park, Illinois, has been a significant player in the water and wastewater treatment industry since its inception in 1969. The company specializes in providing advanced solutions for aeration, biological treatment, filtration, and disinfection processes. Their product offerings include surface aerators, diffused aeration systems, and innovative filtration technologies like cloth media filtration. Aqua-Aerobic also addresses modern environmental challenges with solutions for PFAS removal, demonstrating their adaptability to evolving regulatory standards and customer needs. The company prides itself on its engineering expertise and customer support, ensuring that clients receive tailored solutions that optimize treatment efficiency and compliance. With a workforce of around 193 employees, Aqua-Aerobic remains focused on serving both municipal and industrial sectors, reinforcing its commitment to effective water management.

2. Pure Water Technology - PHSI

• Website: purewatertech.com
• Ownership type: Corporate
• Headquarters: Lincolnshire, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $57.6M, December 2018
• Founded year: 1996
• Headcount: 51-200
• LinkedIn: pure-water-technology---phsi

Pure Water Technology - PHSI, founded in 1996 and based in Lincolnshire, Illinois, is a water purification company dedicated to providing advanced hydration solutions. The company specializes in innovative water fill stations and specialty units designed to deliver clean and safe drinking water to businesses and organizations. Their mission emphasizes sustainability, aiming to reduce plastic waste and promote eco-friendly practices. Pure Water Technology's systems are equipped with state-of-the-art diagnostics that continuously monitor water quality, ensuring that customers receive healthy and great-tasting water. The company operates through a growing dealer network, which has gained trust from numerous clients both domestically and internationally. Their commitment to technology and environmental responsibility positions them as a significant player in the water treatment industry.

3. Earthwise - Full Water Solutions

• Website: earthwiseenvironmental.com
• Ownership type: Corporate
• Headquarters: Wood Dale, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: September 2023
• Founded year: 1995
• Headcount: 11-50
• LinkedIn: earthwise-environmental-inc

Earthwise - Full Water Solutions, based in Wood Dale, Illinois, has been operational since 1995, specializing in industrial water management solutions. The company serves a variety of sectors, including healthcare, educational institutions, and data centers. Their offerings include comprehensive water systems, consulting services, and continuous monitoring to optimize water usage and ensure compliance with safety standards. Earthwise employs certified water technologists and emphasizes innovation in their approach to water treatment. They focus on sustainable practices, helping clients reduce water and energy consumption while maintaining operational efficiency. Their expertise in managing risks associated with water quality, particularly Legionella, underscores their commitment to safety and regulatory compliance. Earthwise has built a reputation for delivering customized solutions that enhance performance and extend the life of water systems, making them a trusted partner in the industry.

4. Carus

• Website: carusllc.com
• Ownership type: Private
• Headquarters: Peru, Illinois, United States (USA)
• Employee distribution: United States (USA) 95%, Peru 4%, Other 2%
• Founded year: 1915
• Headcount: 51-200
• LinkedIn: carus-corporation

Carus LLC, based in Peru, Illinois, has been a prominent player in the environmental solutions sector since its founding in 1915. The company specializes in chemical manufacturing tailored for water treatment, air purification, and soil remediation. With a workforce of approximately 168 employees, Carus operates primarily in the United States, but its reach extends globally, serving municipalities and businesses alike. The company offers a range of products designed to tackle various environmental challenges, particularly in municipal water and wastewater treatment. Carus is committed to sustainability and actively participates in community outreach programs, emphasizing education and environmental initiatives. Their focus on continuous research and development ensures that they remain at the forefront of innovative solutions in the industry.

5. Lakeside Equipment Corporation

• Website: lakeside-equipment.com
• Ownership type: Private
• Headquarters: Bartlett, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1928
• Headcount: 11-50
• LinkedIn: lakeside-equipment-corporation

Lakeside Equipment Corporation, based in Bartlett, Illinois, has been a significant player in the water treatment industry since its inception in 1928. The company specializes in manufacturing equipment and process solutions for wastewater treatment, catering to both municipal and industrial sectors. Their product lineup includes screw pumps, screening systems, grit collection, and biological treatment solutions, all designed to enhance the efficiency and effectiveness of water purification processes. Lakeside is committed to quality and customer service, providing tailored solutions that meet the unique needs of their clients. As a 100% employee-owned company, they emphasize a collaborative approach, ensuring that each project is handled by experienced engineers and technicians. This dedication to customer satisfaction and innovation has allowed Lakeside to maintain a strong presence in the water treatment market, serving clients not only in North America but also globally.

6. Cyclopure

• Website: cyclopure.com
• Ownership type: Corporate
• Headquarters: Evanston, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Series B, $4.0M, November 2019
• Founded year: 2016
• Headcount: 11-50
• LinkedIn: cyclopure-inc.

Cyclopure, based in Evanston, Illinois, is a water treatment company founded in 2016 that specializes in solutions for PFAS removal. Their flagship product, DEXSORB, is a renewable adsorbent designed to effectively eliminate PFAS from various water sources, ensuring safe drinking water for consumers, municipalities, and industries. Cyclopure's mission emphasizes environmental health and the importance of clean water, which drives their innovative approach to water purification. The company has also developed additional products like Purefast filters and water testing kits, further expanding their offerings in the water treatment market. With a team of dedicated professionals and a focus on sustainable solutions, Cyclopure is actively involved in addressing the global PFAS contamination crisis. They have received $4 million in Series B funding, reflecting their growth and the increasing demand for effective water treatment solutions.

7. Engineered Fluid, Inc.

• Website: engineeredfluid.com
• Ownership type: Private
• Headquarters: Centralia, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1946
• Headcount: 51-200
• LinkedIn: engineered-fluid-inc.

Engineered Fluid, Inc. (EFI-Solutions) is a private company based in Centralia, Illinois, founded in 1946. With a workforce of approximately 29 employees, EFI-Solutions has carved out a niche in the water management industry. The company designs and manufactures custom-built equipment and systems for water distribution, treatment, and wastewater management. Their expertise spans various applications, including municipal water systems and industrial processes. EFI-Solutions prides itself on delivering high-quality products and exceptional customer support, ensuring that their solutions meet the specific needs of their clients. Their extensive experience in the field allows them to provide innovative and efficient water management solutions, making them a significant player in the industry.

8. WaterSurplus

• Website: watersurplus.com
• Ownership type: Corporate
• Headquarters: Loves Park, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: April 2025
• Founded year: 1988
• Headcount: 51-200
• LinkedIn: watersurplus

WaterSurplus, based in Loves Park, Illinois, has been a notable entity in the water treatment industry since its inception in 1988. The company specializes in providing innovative solutions for water treatment, with a particular emphasis on PFAS removal. They cater to both municipalities and businesses, offering a comprehensive suite of services that includes engineering, equipment rental, and a marketplace for surplus water treatment equipment. WaterSurplus is recognized for its commitment to sustainability and has developed advanced technologies that minimize chemical use and energy consumption in water treatment processes. Their PFAS solutions are engineered to meet regulatory standards, ensuring safe and clean water for communities. With a focus on optimizing water treatment systems and a track record of successful projects, WaterSurplus has positioned itself as a key partner in the ongoing efforts to address water quality challenges.

9. Aquion, Inc.

• Website: aquion.com
• Ownership type: Corporate
• Headquarters: Roselle, Illinois, United States (USA)
• Latest funding: $160.0M, February 2019
• Founded year: 1953
• Headcount: 51-200
• LinkedIn: aquion-inc-

Aquion, Inc., based in Roselle, Illinois, has been a player in the water treatment industry since its founding in 1953. The company specializes in manufacturing premium water treatment equipment and solutions tailored for both residential and commercial applications. Their product lineup includes water conditioners, iron filters, carbon filters, drinking-water purifiers, and advanced disinfection systems such as ozone and ultraviolet technologies. Aquion operates from a state-of-the-art manufacturing facility that spans 160,000 square feet and is ISO 9001-2015 certified, ensuring high standards in production. The company has a strong focus on customer satisfaction and product performance, catering primarily to independent dealers and plumbing contractors. In 2019, Aquion was acquired by Pentair, which has allowed them to maintain their operational identity while benefiting from the resources of a larger entity. This acquisition has not diminished their commitment to providing quality water solutions globally.

10. WET Solutions, Inc

• Website: wetsolutionsinc.com
• Ownership type: Corporate
• Headquarters: Schaumburg, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: May 2024
• Founded year: 1994
• Headcount: 11-50
• LinkedIn: wet-solutions-inc

WET Solutions, Inc. is a water treatment company based in Schaumburg, Illinois, established in 1994. The firm specializes in providing customized solutions for cooling water, boiler water, and wastewater treatment. With a team of trained scientists, WET Solutions develops tailored programs that address specific water quality challenges faced by various industries, including food and beverage and healthcare. Their services not only enhance operational efficiency but also promote sustainability, aligning with the growing demand for environmentally responsible practices. The company offers a range of solutions, including ProMoss™, a chemical-free treatment alternative aimed at improving heat transfer and conserving water. WET Solutions is committed to ongoing evaluation and support, ensuring that their clients receive the best possible service and results. With a workforce of 11-50 employees, the company maintains a focused and specialized approach to water treatment, making it a relevant player in the industry.

11. Angel Water, Inc.

• Website: angelwater.com
• Ownership type: Private
• Headquarters: Barrington, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1972
• Headcount: 11-50
• LinkedIn: angel-water

Angel Water, Inc., based in Barrington, Illinois, has been a player in the water treatment industry since its founding in 1972. The company focuses on providing water filtration systems and related services to homeowners, ensuring access to clean and safe drinking water. Their product lineup includes water softeners, reverse osmosis systems, chlorine injection systems, and whole house water filters, among others. In addition to these products, Angel Water offers plumbing services, maintenance, and water testing, which are crucial for maintaining water quality. The company operates primarily in Illinois and Florida, serving local communities with a commitment to health and safety. Their CEO, Andrew Wilson, advocates for clean water, emphasizing the importance of prevention in health. With a solid reputation reflected in customer reviews and a focus on personalized service, Angel Water positions itself as a reliable option for homeowners seeking water treatment solutions.

12. Culligan International

• Website: culliganinternational.com
• Ownership type: Private
• Headquarters: Rosemont, Illinois, United States (USA)
• Employee distribution: United States (USA) 50%, United Arab Emirates 8%, Spain 7%, Other 35%
• Founded year: 1936
• Headcount: 10001+
• LinkedIn: culligan-international-company

Culligan International, based in Rosemont, Illinois, is a prominent water treatment company that has been operational since 1936. The firm specializes in providing innovative solutions for clean and safe drinking water, serving both consumers and businesses. Their product offerings are designed to enhance water quality in various environments, including homes, offices, gyms, and public spaces. Culligan places a strong emphasis on sustainability, actively working to minimize their environmental footprint. They report significant achievements in reducing plastic waste and CO2 emissions, showcasing their commitment to ethical practices. With a workforce of over 10,000 employees and a presence in multiple countries, Culligan continues to play a vital role in the water treatment industry, focusing on both product innovation and social impact.

13. LiquiTech

• Website: liquitech.com
• Ownership type: Private
• Headquarters: Westmont, Illinois, United States (USA)
• Employee distribution: United States (USA) 96%, South Africa 4%
• Founded year: 1985
• Headcount: 11-50
• LinkedIn: liquitech-environmental

LiquiTech, based in Westmont, Illinois, is a private water treatment company founded in 1985. With a workforce of approximately 45 employees, the company specializes in innovative solutions for water quality management. Their product lineup includes Copper-Silver Ionization systems, sediment filtration, UV disinfection, smart sensors, and point-of-use filters. LiquiTech primarily serves the healthcare, education, and commercial sectors, focusing on ensuring safe water systems and compliance with health regulations. The company also offers services such as Legionella remediation, water management plans, and water testing and analysis. With over 3,000 installations and a commitment to sustainable practices, LiquiTech has established itself as a significant player in the water treatment industry, addressing critical issues related to waterborne pathogens and system efficiency.

14. Wachs Water Services

• Website: wachsws.com
• Ownership type: Corporate
• Headquarters: Buffalo Grove, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $18.5M, April 2015
• Founded year: 2000
• Headcount: 51-200
• LinkedIn: wachs-water-services

Wachs Water Services, based in Buffalo Grove, Illinois, is a company dedicated to improving water distribution systems. Founded in 2000, it specializes in helping utilities manage and optimize their aging infrastructure. This focus is crucial as many water systems face challenges related to deterioration and inefficiency. Wachs Water Services provides solutions that enhance water quality and mitigate the risks of system failures. As part of Xylem, a prominent water technology company, Wachs benefits from a strong backing and a broad range of resources. Their services are essential for utilities aiming to meet operational and regulatory demands in water management.

15. Culligan ZeroWater

• Website: zerowater.com
• Ownership type: Private
• Headquarters: Rosemont, Illinois, United States (USA)
• Employee distribution: United States (USA) 65%, Mexico 35%
• Founded year: 2003
• Headcount: 11-50
• LinkedIn: zerowater

Culligan ZeroWater, founded in 2003 and based in Rosemont, Illinois, is a private water filtration company that focuses on enhancing the quality of drinking water for consumers. The company offers a range of products, including advanced filtration systems and replacement filters, primarily through an online store. Their flagship product features a 5-stage filtration process that is certified to remove 99.7% of lead and 95% of harmful forever chemicals like PFOA and PFOS. This technology not only improves water quality but also promotes environmental sustainability by reducing reliance on single-use plastic bottles. With a workforce of around 20 employees, Culligan ZeroWater operates mainly in the United States and Mexico, catering to a growing consumer base that prioritizes clean and safe drinking water. The company has not reported any recent funding, indicating a stable operational model focused on direct consumer sales and subscriptions for filter replacements.

16. The U.S. Water Culligan Group

• Website: uswatercompany.com
• Ownership type: Private
• Headquarters: Wheeling, Illinois, United States (USA)
• Employee distribution: United States (USA) 91%, Pakistan 9%
• Founded year: 1988
• Headcount: 201-500
• LinkedIn: u-s-water-holding-company-llc

The U.S. Water Culligan Group, based in Wheeling, Illinois, is a private water treatment company that has been operational since 1988. It specializes in providing water softening, filtration, and delivery services to both homeowners and businesses. The company operates through a network of local dealerships across several states, including Illinois, Nevada, Virginia, Maryland, and Washington D.C. This structure allows them to offer tailored solutions to meet the specific water quality needs of their customers. With a workforce of over 200 employees, the company prides itself on delivering superior local expertise in technical service, customer service, and sales. Their offerings include free water testing, various water treatment systems, and maintenance services, all aimed at enhancing water quality for their clients. The U.S. Water Culligan Group has built a reputation for reliability and customer satisfaction, which is crucial in the water treatment industry.

17. Charger Water Treatment Products

• Website: chargerwater.com
• Ownership type: Family Owned
• Headquarters: Morton Grove, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1980
• Headcount: 51-200
• LinkedIn: chargerwatertreatmentproducts

Charger Water Treatment Products, based in Morton Grove, Illinois, is a family-owned company that has been providing high-quality water treatment solutions since 1980. The company specializes in a range of products, including water softeners, iron and hydrogen sulfide filters, whole house filtration systems, and scale control solutions. They cater to both homeowners and businesses, ensuring access to clean and safe water. Charger operates through a network of dealers and has established a strong presence across the United States with multiple distribution centers. Their commitment to educating customers about water quality and providing tailored solutions highlights their expertise in the field. With a focus on American manufacturing, Charger Water Treatment Products emphasizes quality and reliability in their offerings, making them a trusted partner for water treatment professionals.

18. Enviro-Care Company

• Website: enviro-care.com
• Ownership type: Corporate
• Headquarters: Gurnee, Illinois, United States (USA)
• Latest funding: March 2015
• Founded year: 1972
• Headcount: 11-50
• LinkedIn: enviro-care-company

Enviro-Care Company, now known as SAVÉCO North America, Inc., is a manufacturer based in Gurnee, Illinois, specializing in wastewater treatment solutions. Established in 1972, the company has built a reputation for providing a range of products designed to assist both municipal and industrial customers in managing wastewater effectively. Their product lineup includes advanced screening systems, solids management equipment, and grit management solutions, all aimed at ensuring compliance with environmental regulations. With a dedicated team of approximately 17 employees, Enviro-Care has maintained its operational integrity and expertise even after its acquisition by the Italian multinational WAMGROUP. This transition has allowed them to enhance their product offerings and expand their market reach while continuing to serve their existing customer base with the same level of commitment and quality.

19. StormTrap

• Website: stormtrap.com
• Ownership type: Private Equity
• Headquarters: Romeoville, Illinois, United States (USA)
• Employee distribution: United States (USA) 97%, Canada 3%
• Latest funding: April 2022
• Founded year: 2002
• Headcount: 51-200
• LinkedIn: stormtrap

StormTrap, founded in 2002 and based in Romeoville, Illinois, is a private equity-owned company that specializes in stormwater management solutions. With a workforce of approximately 103 employees, StormTrap offers a variety of products designed to manage stormwater runoff effectively. Their offerings include systems for detention, infiltration, and treatment, which are essential for improving water quality and protecting waterways. The company serves a wide array of markets, including commercial, residential, industrial, and governmental sectors, providing customized solutions that comply with local regulations. StormTrap's innovative approach includes modular designs that minimize site disruption and installation costs. Their commitment to customer support and ongoing maintenance services further solidifies their role in the water treatment industry.

20. Gasvoda & Associates, INC.

• Website: gasvoda.com
• Ownership type: Private
• Headquarters: Calumet City, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1983
• Headcount: 11-50
• LinkedIn: gasvoda-%26-associates-inc.

Gasvoda & Associates, INC., also known as Gasvoda Group, is a private company based in Calumet City, Illinois, specializing in water and wastewater solutions since its inception in 1983. With a workforce of 21 employees, the company serves both municipal and industrial clients, providing a comprehensive array of equipment and services designed to meet specific project requirements. Their offerings include advanced technologies for aeration, filtration, chemical feed systems, and more, ensuring that they can address a wide variety of water treatment challenges. Gasvoda Group prides itself on its commitment to customer satisfaction, offering round-the-clock service support to maintain operational efficiency. Their focus on building lasting relationships with clients further underscores their dedication to the water treatment industry.

Water Treatment Insights: Key Companies in Illinois

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