- Degrémont
 - Environmental engineering company and general contractor specialised in building turn-key water treatment facilities. - Aqua-Chem, Inc.
- Offer water desalination and industrial wastewater purification evaporators.
- Waterlink, Inc. (3)
- Triangular Wave Technologies, Inc.
- Offers a system for controlling scale and bio-fouling in residential and commercial areas. Prevents bio corrosion, fouling build up, and biofilm.
- APS Analyitical Standards
- Specialises in turbidity in water treatment, light scattering and absorbance, and the use of the McFarland standards in turbidimeters, spectrophotometer, and colorimeters.
- Castle Environmental
- Provides environmental solutions and specialises in the design, supply, and operator training of water and wastewater treatment systems.
- Applied Specialties, Inc.
- Specialises in providing water and wastewater treatment programmes for heavy to light industrial, utility, and municipal systems.
- Commonwealth Engineering and Technology, Inc.
- Specialising in water and wastewater engineering and also providing GIS / GPS services, as well as stormwater management, wetlands delineation, and watershed studies.
- Spragg Bag Project
- Provides information regarding transporting fresh water via giant waterbags.
- WATEC, Incorporated
- Specialists in water management, analysis, purification training, engineering, and consulting. Distributors of chemical free water treatment.
- U.S. Water L.L.C.
- Provides turnkey solutions for municipal and industrial water and wastewater facilities.
- EMCO Engineering
- Providing turnkey solutions for municipal and industrial water and wastewater treatment.
- Hydrotech Environmental Systems
- Provides well systems for capture and extraction of groundwater and contaminants from surficial aquifers.
- Naston Ltd
- Offering water and wastewater treatment engineering services.
- Florida Aquastore
- Designs and constructs water storage tanks and wastewater treatment plant technologies.
- Charles A. Manganaro Consulting Engineers
- Offering services in municipal & environmental engineering, water & wastewater, site development, and construction management.
- Force Engineering Services
- Provides engineering solutions for the water and wastewater industries.
- Brackett Group (1)
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