- AnoxKaldnes
 - High technology company focusing on biological wastewater treatment products and services. - Aquatech, Ltd.
- Developers of a wastewater treatment called the Jarikko Purification System.
- Biocube, Inc.
- Manufactures biofilters and odour control systems. Utilizes biofiltration to neutralize harmful hydrogen sulfide and other gas emmissions.
 Biocycle Waste Water Treatment System
- Replacement to the septic tank system. Burt Environmental Systems Technology
- Designed for domestic sewage, it uses natural biological bacteria in both the aerobic and anaerobic chambers of the tank to digest sewage.- Diffuser Express
- Replacement diffuser membranes and units for water and wastewater aeration. Also manufactures disc diffuser units, disc membranes, and tube diffusers.
- Digital Analysis Corpooration
- Manufacturer of pH neutralization and adjustment systems.
- Ecological Systems
- Industrial waste treatment and management company headquartered in Indianapolis, Indiana.
- EFLO International, Ltd.
- Specialists in designing and building sewage treatment plants for both land and marine use.
- Hoffman Air & Filtration Systems
- Manufactures product lines of industrial vacuum cleaning systems, centrifugal blowers, liquid filtration equipment, and waste handling equipment.
- Huber Technology
- Provides machinery, components, and systems for water treatment.
- Integrated Engineers
- Providing consulting, design engineering, equipment, regulatory compliance, and chemicals for wastewater treatment
- Iseki Utility Services Limited
- Specialises in the design of vacuum sewerage systems and manufactures other key equipment.
- Lemna Corporation
- Provides industrial and municipal wastewater treatment and offers biological treatment, ammonia reduction, and nutrient removal.
- McNeill Company, The
- Wastewater treatment services for a range of clients including city, county, and state governments, commercial developers, school districts, hospitals, and more.
- Natural Water Systems, Inc.
- Develops energy efficient, environmentally benign, innovative alternatives to traditional wastewater treatment systems.
- Nature Technology Solution AS
- Provides small and large scale technology for wastewater treatment.
- Owls Hall Environmental Limited
- Offers design, supply, installation, servicing, and de-sludging of pollution control and rainwater harvesting products including sewage treatment and storage, pump stations, separators, and rainwater harvesting products.
- WMEC Ltd.
- Developers and manufacturers of units for treating chemically contaminated water.
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