Maryland's water treatment industry plays a vital role in ensuring the delivery of safe and clean water while managing wastewater systems. This sector includes companies focused on various aspects of water management, from chemical production to equipment manufacturing and engineering services. As concerns over water safety and sustainability grow, these companies are innovating with eco-friendly technologies and efficient practices. Interestingly, many organizations now emphasize recycling and conservation, reflecting broader trends in environmental responsibility and public health initiatives, ultimately shaping a more resilient approach to water treatment across the region.


This list features 25 water treatment companies based in Maryland, ranging from small family-owned entities to larger corporate firms. Founded between 1935 and 2005, these companies are situated in various locales, from Baltimore to Fredericksburg. Many specialize in producing treatment chemicals, apparatus for wastewater management, or ecosystem restoration, often emphasizing customized solutions to meet client needs. With workforce sizes varying from a handful to thousands, each company contributes unique services, thereby enhancing the sector’s overall capacity to tackle water challenges effectively.


Continue reading to discover the top water treatment companies in Maryland.


Top 25 Water Treatment Companies Companies in Maryland


1. Usalco

  • Website: usalco.com
  • Ownership type: Private Equity
  • Headquarters: Baltimore, Maryland, United States (USA)
  • Employee distribution: United States (USA) 95%, Puerto Rico 5%
  • Latest funding: August 2024
  • Founded year: 1980
  • Headcount: 201-500
  • LinkedIn: usalco

Usalco, based in Baltimore, Maryland, is a private equity-owned company that has been operating since 1980. It specializes in the production of chemicals for drinking water and wastewater treatment. With a workforce of approximately 218 employees, Usalco is dedicated to providing innovative solutions to municipalities and industrial clients, ensuring compliance with stringent water quality standards. The company offers a comprehensive range of products, including its well-regarded DelPAC, AlcoPAC, and UltraPAC brands, which are utilized in various applications such as municipal water treatment and industrial processes. Usalco's commitment to sustainability and safety is evident in its operational philosophy, which emphasizes excellence and innovation. The company is also actively expanding its capabilities, as highlighted by its recent announcement of a new production facility in California, aimed at enhancing its service offerings in the water treatment sector.


2. Chemstar WATER

  • Website: chemstarwater.com
  • Ownership type: Private
  • Headquarters: Middle River, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1999
  • Headcount: 11-50
  • LinkedIn: chemstarwater

Chemstar WATER, based in Middle River, Maryland, is an industrial water treatment company that has been operational since 1999. With a workforce of approximately 37 employees, the company specializes in providing a range of water treatment products and services tailored to various sectors, including data centers, healthcare, and food & beverage. Chemstar WATER emphasizes optimizing water usage and enhancing energy efficiency while ensuring compliance with health standards. Their service model is built around customer engagement, offering customized solutions that address specific industry needs. The company also provides a variety of services, including cooling water treatment, legionella prevention, and wastewater management, showcasing their comprehensive approach to water treatment. Chemstar WATER has built a reputation for reliability, serving not only commercial clients but also government institutions and military facilities, which speaks to their capability in handling complex water treatment challenges.


3. Carroll Water Systems, Inc.

  • Website: carrollwater.com
  • Ownership type: Family Owned
  • Headquarters: Cockeysville, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1983
  • Headcount: 11-50
  • LinkedIn: carroll-water-systems-inc-

Carroll Water Systems, Inc., based in Cockeysville, Maryland, has been a family-owned business since its founding in 1983. With a workforce of 11 to 50 employees, the company specializes in water treatment and well drilling services. They cater to both residential and commercial customers, providing tailored solutions to address various water quality issues. Their services include comprehensive water testing, filtration systems, and well services, ensuring that clients have access to clean and safe drinking water. Operating primarily in Maryland, Virginia, and Pennsylvania, Carroll Water is dedicated to resolving water-related challenges. As an authorized dealer of EcoWater products, they offer advanced water treatment systems that are eco-friendly and efficient. Their commitment to customer satisfaction is evident in their focus on personalized service and expert consultation, making them a reliable choice for water treatment solutions.


4. Johnston Construction Co


Johnston Construction Co, based in Finksburg, Maryland, has been operational since 1976. This private company employs between 51 to 200 individuals and has carved a niche in the construction and engineering sector, with a particular emphasis on environmental and industrial projects. Their expertise lies in wastewater and water treatment, where they serve both public and private clients. The company offers a full suite of services, from initial design through to commissioning, ensuring that all projects meet stringent environmental standards. Their project portfolio includes significant upgrades and improvements to various water treatment plants, showcasing their capability in handling complex water treatment challenges. Johnston Construction Co has established itself as a reliable partner in the industry, contributing to the enhancement of water treatment infrastructure across multiple regions.


5. Kappe Associates, Inc

  • Website: kappe-inc.com
  • Ownership type: Corporate
  • Headquarters: Frederick, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: February 2024
  • Founded year: 1946
  • Headcount: 11-50
  • LinkedIn: kappe-associates-inc

Kappe Associates, Inc. is a specialized firm based in Frederick, Maryland, dedicated to providing water and wastewater treatment solutions. Established in 1946, the company has built a reputation for delivering a wide array of products and services that address critical aspects of water management. Their offerings include environmental treatment solutions, disinfection systems, and advanced sludge handling technologies. Kappe Associates serves a variety of clients, primarily municipalities and industrial sectors, ensuring compliance with stringent environmental regulations. The company is also known for its partnerships with recognized manufacturers in the industry, enhancing its product portfolio. With a team of trained professionals, Kappe Associates is committed to maintaining high standards of service and support for its clients, ensuring that their water treatment systems operate efficiently and effectively.


6. Biohabitats

  • Website: biohabitats.com
  • Ownership type: Private
  • Headquarters: Baltimore, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1982
  • Headcount: 51-200
  • LinkedIn: biohabitats

Biohabitats, founded in 1982 and based in Baltimore, Maryland, is an ecological consulting firm that specializes in ecological restoration, conservation planning, and integrated water strategies. With a team of approximately 86 employees, the company serves municipalities, educational institutions, and non-profit organizations, providing expertise to tackle environmental challenges such as habitat degradation and climate change. Biohabitats is particularly noted for its work in water management, offering services that include natural wastewater treatment, constructed wetlands, and water reuse systems. Their approach combines scientific research with community engagement, aiming to restore ecosystems and promote sustainability. The company has a strong focus on innovative solutions that integrate ecological science with traditional planning and design disciplines, making it a relevant player in the water treatment industry.


7. Bond Water Technologies

  • Website: bondwater.com
  • Ownership type: Private
  • Headquarters: Gaithersburg, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1999
  • Headcount: 51-200
  • LinkedIn: bond-water-technologies-inc-

Bond Water Technologies, Inc., based in Gaithersburg, Maryland, has been a player in the water treatment industry since its inception in 1999. The company specializes in providing commercial and industrial water treatment solutions, catering to a variety of sectors including healthcare, food and beverage, and manufacturing. Their services cover a broad spectrum, from cooling and boiler water treatment to wastewater management and HVAC rehabilitation. Bond Water Technologies prides itself on its innovative approaches, such as the introduction of solid chemical water treatment, which aims to enhance efficiency and reduce environmental impact. The company operates with a commitment to quality, as evidenced by their ISO 9001:2015 certified manufacturing processes. With a dedicated team and a focus on customer satisfaction, Bond Water Technologies has built a reputation for delivering effective water treatment solutions tailored to the specific needs of their clients.


8. Sherwood-Logan and Associates

  • Website: sherwoodlogan.com
  • Ownership type: Private
  • Headquarters: Annapolis, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1980
  • Headcount: 11-50
  • LinkedIn: sherwoodlogan

Sherwood-Logan and Associates, Inc. is a private company based in Annapolis, Maryland, specializing in water and wastewater treatment solutions. Established in 1980 by Geoffrey Sherwood and Charles Logan, the firm has evolved from a small manufacturers' representative to a prominent provider of engineered instrumentation and systems integration services. With a workforce of approximately 38 employees, the company boasts over 500 years of combined experience in the water and wastewater sector. Sherwood-Logan primarily serves municipalities across the Mid-Atlantic region, including Maryland, Virginia, Pennsylvania, and New York. Their offerings include high-quality equipment and compliance with environmental regulations, ensuring that their clients meet stringent water quality standards. The company has successfully completed nearly 1,500 control systems projects, demonstrating their capability and commitment to the municipal water market. Their technical staff includes degreed engineers and licensed Professional Engineers, which enhances their ability to tackle complex municipal infrastructure projects.


9. Neu-ion

  • Website: neu-ion.com
  • Ownership type: Family Owned
  • Headquarters: Baltimore, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1991
  • Headcount: 11-50
  • LinkedIn: neu-ion-inc-

Neu-ion, founded in 1991 and based in Baltimore, Maryland, is a family-owned service company that specializes in high purity water systems. With a dedicated team of 23 employees, Neu-ion provides a comprehensive range of services including preventive maintenance, design and engineering, water system sanitization, and water testing and analysis. Their clientele primarily consists of businesses in the biotechnology, healthcare, and pharmaceutical sectors, where the quality and reliability of water systems are paramount. Neu-ion's unique offerings, such as portable exchange deionization tank services and a dedicated regeneration plant for ion exchange resins, set them apart in the industry. Their commitment to customer satisfaction and high-quality service has established them as a trusted partner for organizations that require stringent water quality standards.


10. LifeStraw

  • Website: lifestraw.com
  • Ownership type: Private
  • Headquarters: Baltimore, Maryland, United States (USA)
  • Employee distribution: United States (USA) 50%, Kenya 34%, Vietnam 9%, Other 6%
  • Founded year: 2005
  • Headcount: 51-200
  • LinkedIn: lifestraw

LifeStraw, founded in 2005 and based in Baltimore, Maryland, is a private company that specializes in water filtration technology. The company offers a range of innovative products designed to provide safe drinking water for outdoor enthusiasts, travelers, and those facing emergency situations. Their product lineup includes straw filters, bottle filters, gravity filters, and high-volume purifiers, all aimed at addressing various water quality concerns such as bacteria, parasites, and chemicals. LifeStraw is also recognized for its commitment to social impact through its Give Back program, which ensures that for every product sold, a child receives safe water for an entire year. This initiative has positively impacted millions of children, particularly in regions with limited access to clean water. LifeStraw operates with a global workforce, with significant employee distribution in Kenya and Vietnam, reflecting their international reach and commitment to addressing water safety issues worldwide.


11. Bearing Construction, Inc.


Bearing Construction, Inc., founded in 2000 and based in Sudlersville, Maryland, is a private construction company that specializes in the design, construction, and maintenance of wastewater and water treatment facilities. With a history dating back to 1983, the company has built a strong reputation for delivering projects that meet stringent environmental standards. They serve municipalities and private businesses, offering services that include design-build, operation and maintenance, and project financing. Their team, with many members having over 25 years of experience, ensures that projects are completed efficiently and effectively. Bearing Construction has successfully managed over $379 million in contracts, showcasing their capability in the water treatment sector. Their operational footprint extends across Maryland, Delaware, Pennsylvania, Virginia, and North Carolina, allowing them to respond quickly to project needs in these regions.


12. American Contracting and Environmental Services

  • Website: aceservinc.com
  • Ownership type: Private
  • Headquarters: Marriottsville, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2004
  • Headcount: 201-500
  • LinkedIn: buildingtolast

American Contracting and Environmental Services (ACE), founded in 2004 and based in Marriottsville, Maryland, is a private construction company that specializes in the construction of water and wastewater treatment facilities and pumping stations. With a workforce of approximately 115 employees, ACE focuses on serving municipalities and water authorities, providing essential infrastructure services that ensure clean water and effective wastewater management. The company emphasizes safety and quality in its projects, which are crucial for community health and well-being. ACE self-performs about 70% of its work, including excavation, concrete, and process equipment installation, showcasing their capability to manage complex projects efficiently. Their portfolio includes a range of projects valued between $5 million and $30 million, reflecting their significant involvement in the water treatment industry. ACE is committed to continuous improvement and invests in the professional development of its employees, ensuring they are well-equipped to meet the challenges of the construction sector.


13. Hague Quality Water of Maryland, Inc.


Hague Quality Water of Maryland, Inc. is a family-owned business based in Annapolis, Maryland, specializing in water treatment and plumbing services. Founded in 1993, the company has built a solid reputation for providing effective solutions to water quality issues for both residential and commercial clients. Their service offerings include traditional and compact water softeners, advanced water filtration systems, and comprehensive water testing. In addition to water treatment, they also provide plumbing services, such as well pump repairs and water heater installations. With a focus on customer satisfaction, Hague Quality Water emphasizes the importance of clean and safe water, tailoring their services to meet the specific needs of their clients. Their operational footprint extends across Maryland, Washington D.C., and Delaware, showcasing their regional relevance in the water treatment industry.


14. Environ-Civil Engineering Ltd

  • Website: ece-ltd.com
  • Ownership type: Private
  • Headquarters: Columbia, Maryland, United States (USA)
  • Employee distribution: United States (USA) 73%, Taiwan 14%, Iraq 14%
  • Founded year: 1992
  • Headcount: 11-50
  • LinkedIn: environ-civil-engineering-ltd

Environ-Civil Engineering Ltd, based in Columbia, Maryland, is a private engineering consulting firm founded in 1992. With a team of 23 employees, the company focuses on environmental, water, and wastewater management. They provide a range of services that include construction management, environmental studies, and infrastructure development. ECE has a strong track record in water distribution, collection systems, and wastewater treatment plants. Their technical staff comprises qualified engineers and construction inspectors with extensive experience in civil and environmental engineering. ECE has successfully managed projects for municipal, state, and federal clients, demonstrating their capability to address complex infrastructure and environmental challenges. As a Minority Business Enterprise (MBE), they are recognized for their commitment to quality, integrity, innovation, and responsiveness in all their endeavors.


15. NORAIR Engineering

  • Website: norairengineering.com
  • Ownership type: Family Owned
  • Headquarters: Greater Landover, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1935
  • Headcount: 51-200
  • LinkedIn: norair-engineering-corp.

NORAIR Engineering Corp. is a family-owned construction firm based in Greater Landover, Maryland, with a history dating back to 1935. The company specializes in water infrastructure projects, providing essential services such as mechanical installations and the construction of water treatment facilities. They cater primarily to water utilities in the DC, Maryland, and Virginia areas. Over the decades, NORAIR has successfully completed numerous notable projects, including wastewater treatment plants and pump stations, demonstrating their expertise in the water treatment sector. The company operates as an employee-owned organization, fostering a culture of teamwork and shared success among its workforce. This structure not only enhances employee engagement but also contributes to the quality of their work in the water treatment industry.


16. Synagro

  • Website: synagro.com
  • Ownership type: Corporate
  • Headquarters: Baltimore, Maryland, United States (USA)
  • Employee distribution: United States (USA) 89%, Canada 10%, Other 1%
  • Latest funding: December 2020
  • Founded year: 1986
  • Headcount: 501-1000
  • LinkedIn: synagro

Synagro, founded in 1986 and headquartered in Baltimore, Maryland, is a waste management company that specializes in biosolids treatment and recycling services. With a workforce of approximately 558 employees, Synagro operates across the United States and Canada, providing essential services to municipalities, commercial industries, and agricultural partners. The company focuses on environmental sustainability and public health, offering solutions that include composting and the production of fertilizer pellets. Synagro is recognized as the largest recycler of biosolids, organics, and residuals in North America, managing over 16 million tons of residuals annually. Their commitment to innovation and sustainability is evident in their recent initiatives, such as partnerships aimed at producing renewable energy from biosolids. Synagro's extensive experience and capabilities position them as a trusted partner in the waste management and water treatment industries.


17. Apex Companies, LLC

  • Website: apexcos.com
  • Ownership type: Venture Capital
  • Headquarters: Rockville, Maryland, United States (USA)
  • Employee distribution: United States (USA) 99%, Other 1%
  • Latest funding: February 2023
  • Founded year: 1988
  • Headcount: 1001-5000
  • LinkedIn: apex-companies-llc

Apex Companies, LLC, founded in 1988 and based in Rockville, Maryland, is a consulting and engineering firm that specializes in environmental solutions, water management, and infrastructure services. With a workforce of approximately 1,349 employees, Apex serves both public agencies and private businesses, providing expert guidance on regulatory compliance and project management. The company is particularly noted for its capabilities in water management, offering services such as stormwater management, wastewater management, and water resource planning. Apex is committed to sustainability and actively engages in community involvement, reflecting its dedication to shaping a safe and equitable future. Their recent acquisitions, including firms like Johnson Engineering and Water Science Associates, further bolster their expertise in water resource management and environmental consulting, enhancing their position in the industry.


18. Ames, INC.

  • Website: amesinc.com
  • Ownership type: Private
  • Headquarters: Columbia, Maryland, United States (USA)
  • Employee distribution: United States (USA) 88%, Spain 12%
  • Founded year: 1957
  • Headcount: 11-50
  • LinkedIn: ames-inc.

Ames, INC., established in 1957, operates as a manufacturer's representative based in Columbia, Maryland. The company specializes in water and wastewater treatment solutions, providing a range of products including pumps, controls, and packaged systems. They cater to municipal, commercial, and industrial clients across the Mid-Atlantic region, including Delaware, Maryland, Northern Virginia, West Virginia, and the District of Columbia. Ames, INC. is known for its commitment to quality service, offering installation, maintenance, and repair services to ensure the efficient operation of water management systems. Their facility includes a UL508 certified panel shop, which allows them to create custom control and monitoring solutions. With a dedicated team and a strong reputation among consulting engineers, contractors, and manufacturers, Ames, INC. continues to play a significant role in the water treatment industry.


19. EVAPCO, Inc.

  • Website: evapco.com
  • Ownership type: Private
  • Headquarters: Taneytown, Maryland, United States (USA)
  • Employee distribution: United States (USA) 90%, Brazil 3%, South Africa 2%, Other 5%
  • Founded year: 1976
  • Headcount: 1001-5000
  • LinkedIn: evapco

EVAPCO, Inc., founded in 1976 and based in Taneytown, Maryland, is a private company that manufactures cooling and refrigeration solutions. With a workforce of over 600 employees, the company serves various sectors, including commercial HVAC, industrial refrigeration, and power generation. EVAPCO is dedicated to innovation and sustainability, focusing on designing high-quality products that meet the needs of its clients. Their water treatment systems, such as the Smart Shield® and Pulse-Pure®, are engineered to improve water efficiency and reduce chemical usage, showcasing their commitment to environmentally friendly practices. The company operates globally, with a presence in multiple countries, and emphasizes research and development to continuously enhance its product offerings.


20. Atlantic Blue Water Services


Atlantic Blue Water Services, based in Westminster, Maryland, has been a key player in the water treatment industry since its inception in 1994. The company specializes in a variety of services, including water testing, water softening, plumbing repairs, and well services. They cater to both residential and commercial customers, ensuring a safe and clean water supply. Atlantic Blue is known for its customer-centric approach, offering free water testing and 24-hour emergency services. Their facility in Westminster is recognized as Maryland's largest water treatment retail store, showcasing a wide array of water treatment products and solutions. The company is fully licensed, insured, and certified in backflow prevention, underscoring their commitment to quality and safety. With a strong focus on community service and customer satisfaction, Atlantic Blue Water Services has built a solid reputation over the years, making it a trusted name in the water treatment sector.


21. Process Wastewater Technologies, LLC


Process Wastewater Technologies, LLC (PWTech), established in 2006, is a private manufacturer based in Rosedale, Maryland. The company specializes in advanced technologies for water and wastewater treatment, focusing on sludge thickening and dewatering solutions. PWTech's innovative products, such as the Volute Dewatering Press and various screening technologies, cater to municipal treatment facilities and industries that generate sludge. Their commitment to using American-produced stainless steel in manufacturing sets them apart in the industry, as few manufacturers can make such a claim. PWTech aims to provide efficient and environmentally compliant solutions, helping clients manage wastewater while adhering to regulatory standards. The company has a dedicated team with extensive experience in the water treatment sector, ensuring that they remain relevant and responsive to the needs of their customers.


22. National Water Service


National Water Service, based in Highland, Maryland, has been providing water treatment and plumbing services since its founding in 1983. The company caters to both residential and commercial customers, offering a wide array of solutions that include water testing, well pump installation, and general plumbing repairs. Their product offerings range from water softeners and reverse osmosis systems to ultraviolet disinfection and radon removal systems. National Water Service operates primarily in Maryland, Northern Virginia, and Washington D.C., showcasing their regional expertise. The company prides itself on its customer service, as evidenced by numerous positive testimonials from satisfied clients. They also emphasize the importance of water quality, providing free basic water quality tests and extensive contaminant testing services. This focus on water quality and customer education further solidifies their role in the water treatment industry.


23. STH, Inc

  • Website: sthinc.com
  • Ownership type: Private
  • Headquarters: Frederick, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1973
  • Headcount: 51-200
  • LinkedIn: sthinc

STH, Inc., based in Frederick, Maryland, has been a prominent player in the water management industry since its inception in 1973. The company specializes in a variety of water management solutions, including domestic water boosters, wastewater pumps, and fire pumps. STH serves a broad spectrum of clients, including commercial enterprises and municipal entities, ensuring effective water distribution and management. Their engineering services further enhance their offerings, providing clients with tailored solutions for their specific water needs. STH is also involved in agricultural applications and rainwater harvesting systems, showcasing their adaptability to different water management challenges. With a dedicated team and a focus on quality service, STH continues to support the water treatment industry effectively.


24. George, Miles & Buhr, LLC

  • Website: gmbnet.com
  • Ownership type: Private
  • Headquarters: Salisbury, Maryland, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1960
  • Headcount: 51-200
  • LinkedIn: george-miles-%26-buhr-llc

George, Miles & Buhr, LLC (GMB) is an architectural and engineering firm based in Salisbury, Maryland, established in 1960. With a workforce of approximately 68 employees, GMB specializes in a variety of services, including architecture, civil/site engineering, and construction services. A significant aspect of their work involves water and wastewater engineering, where they design and consult on systems that manage water resources effectively. GMB has collaborated with government entities and private clients on numerous projects, focusing on sustainable and functional designs that enhance community infrastructure. Their portfolio includes notable projects such as the Hampstead Wastewater Treatment Plant and various stormwater management initiatives, showcasing their expertise in the water treatment sector.


25. Mallick Plumbing & Heating

  • Website: mallickplumbing.com
  • Ownership type: Private
  • Headquarters: Gaithersburg, Maryland, United States (USA)
  • Employee distribution: United States (USA) 68%, India 32%
  • Founded year: 1996
  • Headcount: 11-50
  • LinkedIn: mallickplumbing

Mallick Plumbing & Heating, Inc. is a privately owned plumbing and heating service provider based in Gaithersburg, Maryland. Founded in 1996, the company has built a reputation for delivering a wide range of services, including plumbing repairs, water heater installations, and emergency plumbing solutions for both residential and commercial clients. Their team consists of licensed technicians who are committed to customer satisfaction and quality workmanship. Notably, Mallick Plumbing & Heating also offers water treatment services, which include reverse osmosis systems, UV water purifiers, filtration systems, and water softeners. This involvement in water treatment reflects their capability to address water quality issues, although their broader focus on plumbing and heating may overshadow this aspect of their business.



Water Treatment Companies Insights: Key Companies in Maryland


CompanyHeadquarterSizeFoundedOwnership
UsalcoBaltimore, Maryland, United States (USA)201-5001980Private Equity
Chemstar WATERMiddle River, Maryland, United States (USA)11-501999Private
Carroll Water Systems, Inc.Cockeysville, Maryland, United States (USA)11-501983Family Owned
Johnston Construction CoFinksburg, Maryland, United States (USA)51-2001976Private
Kappe Associates, IncFrederick, Maryland, United States (USA)11-501946Corporate
BiohabitatsBaltimore, Maryland, United States (USA)51-2001982Private
Bond Water TechnologiesGaithersburg, Maryland, United States (USA)51-2001999Private
Sherwood-Logan and AssociatesAnnapolis, Maryland, United States (USA)11-501980Private
Neu-ionBaltimore, Maryland, United States (USA)11-501991Family Owned
LifeStrawBaltimore, Maryland, United States (USA)51-2002005Private
Bearing Construction, Inc.Sudlersville, Maryland, United States (USA)51-2002000Private
American Contracting and Environmental ServicesMarriottsville, Maryland, United States (USA)201-5002004Private
Hague Quality Water of Maryland, Inc.Annapolis, Maryland, United States (USA)11-501993Family Owned
Environ-Civil Engineering LtdColumbia, Maryland, United States (USA)11-501992Private
NORAIR EngineeringGreater Landover, Maryland, United States (USA)51-2001935Family Owned
SynagroBaltimore, Maryland, United States (USA)501-10001986Corporate
Apex Companies, LLCRockville, Maryland, United States (USA)1001-50001988Venture Capital
Ames, INC.Columbia, Maryland, United States (USA)11-501957Private
EVAPCO, Inc.Taneytown, Maryland, United States (USA)1001-50001976Private
Atlantic Blue Water ServicesWestminster, Maryland, United States (USA)11-501994Private
Process Wastewater Technologies, LLCRosedale, Maryland, United States (USA)11-502006Private
National Water ServiceHighland, Maryland, United States (USA)11-501983Private
STH, IncFrederick, Maryland, United States (USA)51-2001973Private
George, Miles & Buhr, LLCSalisbury, Maryland, United States (USA)51-2001960Private
Mallick Plumbing & HeatingGaithersburg, Maryland, United States (USA)11-501996Private


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