Paques
- Develops and produces purification systems for water, gases and air, using biotechnology.
- http://www.paques.nl/

ThermoEnergy Corporation
- Integrated technologies company engaged in the worldwide commercialization of advanced new environmental technologies in the areas of clean energy, municipal and industrial wastewater treatment and agricultural wastewater treatment.
- http://www.thermoenergy.com/

Arthur A. Schrage P.E., Inc.
- Sanitary engineering consultant, specializing in sewage treatment for cities, townships, and commercial properties
- http://www.sewer1.com/

Expertise Limited
- Water and environmental engineers design, troubleshoot and commission water and effluent treatment plants.
- http://www.wastewatertreatmentplantdesign.co.uk

Hitech International
- Consultants in water and waste water technology. Offers a full range of engineering services from commissioning and trouble-shooting to complete design and supply.
- http://hitechinternational.co.uk

North American Wetland Engineering, P.A.
- Constructed wetlands and innovative wastewater solutions for industry, residential developments, small communities, and single family homes. Based in Minnesota.
- http://www.nawe-pa.com/

Jeffrey R. Naumann and Associates
- Environmental consulting services to industry, specializing in wastewater treatment, storm water, air permitting, and hazardous materials plans.
- http://www.jeffnaumannassociates.com/

Ray Kenny Environmental Consulting
- Offers training, troubleshooting, and optimization of activated sludge and aerated lagoon industrial wastewater treatment systems. Describes services and experience. Based in Ontario, Canada; has worked internationally.
- http://www.raykenny.com/

New Hampshire Soil Consultants
- Environmental consultants specializing in wetland science, soil science, subsurface sewage disposal and environmental planning.
- http://www.nhsc.net/

Hydro Dynamics Company
- Providing water and wastewater treatment equipment consultants, engineers and manufacturers representatives to Ohio and surrounding communities.
- http://www.hydrodynamicscompany.com/

Enviros Leachate Management Team
- Landfill leachate management services, specialising in biological treatment processes. Contains technical information and downloadable articles and papers on leachate treatment.
- http://www.leachate.co.uk/

Bioazul S.L.
- Provides services for companies and universities participating in international R and D projects in the field of environmental protection. It also commercialises innovative environmental products such as membranes for wastewater treatment.
- http://www.bioazul.com/

Dr. Gunnar Demoulin
- Consulting in water and wastewater treatment.
- http://www.gunnardemoulin.com/

H2O Building Services
- Water and effluent efficiency consultancy specialising in installation of cost reduction proceedures.
- http://www.h2obuildingservices.co.uk/

Dr. Peter Ott Garrel
- Consultant in the field of water supply systems and waste water treatment.
- http://www.dr.ott-de.com/

SFC Group
- A group of companies specialized in water and wastewater treatment using most recent and reliable technologies.
- http://www.sfcu.at/

A.S.K Process Consultants Ltd
- A process engineering consultancy providing process design services to industries such as waste water, water, construction and other chemical industries.
- http://askprocess.co.uk/

Biospot biotechnology consultants
- Landfill leachate treatment and MSW to green power and green fuels production.
- http://www.biospot.com.au/

Environmental Services Management System
- Web-based Ontario regulatory agency environmental management software. Reporting tools include wastewater,biosolids sludge, siltation control, and incident tracking.
- http://www.envirosystem.ca/

The Stover Group
- An internationally recognized organization providing specialty services and products convering virtually the full spectrum of water quality related issues.
- http://www.stovergroup.com/

Juanicó - Environmental Consultants Ltd.
- Conceptual and process design in environmental protection for warm regions.
- http://www.juanico.co.il/

Timberland Chemical and Equipment
- Custom design and build wastewater reclamation systems for a variety of industrial and commercial waste streams.
- http://timberlandchemical.com/

Thompson Environmental Consulting
- Specializing in water, wastewater, and wetland permitting, compliance, inspections and monitoring.
- http://www.thompsonenv.com/

Witchwater, Inc.
- Wastewater plant support site constructed with information on regulatory, operations and maintenance issues targeted to the Midwest. A form is available to submit questions. The author is a consultant for hire.
- http://witchw.net/

Rein and Associates
- Provides services for wastewater treatment design, plant operations, consulting, optimization,and expert witness services.
- http://myweb.cableone.net/drein/

J K Environmental Services
- Consult on waste water treatment problems, supply PRN, advise on environmental strategy, design websites, custom build software for industry.
- http://www.jkes.co.uk/

Vexamus Water Ltd
- Provider of integrated water purification and wastewater treatment solutions, offering a full design, construction, installation, commissioning and maintenance service to utility, construction and industrial companies.
- http://www.vexamus.com/

Construction EcoServices
- Offers a broad range of storm water pollution prevention plan (SWPPP) compliance services to general contractors, builders and developers.
- http://www.constructionecoservices.com/

Atlantic Environmental Systems, Inc.
- MOPS, manufactured odorless pump stations, is a system for engineering design, sizing, and permitting of sewage and wastewater lift stations made to meet the Ten States Standards.
- http://www.emops.com/

Chem-Aid Services Inc
- Canadian distributor of chlorination equipment and accessories for water and waste water treatment. Full range of accessories and chemical awareness training available. Distributor for Chlorine Institute emergency capping kits for chlorine, sulfur dioxid
- http://www.chem-aidservices.com/

Wolverton Environmental Services
- Developed and provides phytoremediation (plant + remediation) techniques for municipal, industrial and agricultural waste water. Located in Picayune, Mississippi.
- http://www.wolvertonenvironmental.com/

Environmental Business Specialists, LLC
- Wastewater consulting company specializing in providing solutions in the pulp and paper, municipal, food processing, refining and petrochemical processing industries throughout North America.
- http://www.ebsbiowizard.com/

Johnston Smith Consulting Limited
- Specialists in sewage treatment, septic tanks and sewage systems.
- http://www.johnstonsmith.co.uk/

Paramount Ltd.
- Offers consultancy and turnkey project execution services in the field of treatment of industrial water, sewage and reuse.
- http://www.paramountlimited.com/

Pollution Solutions and Designs
- An Australian based specialist consultant that plans and designs solids processing facilities and management plans for water and wastewater treatment plants.
- http://www.psd.net.au/

Wastewater Process Engineering Inc
- Solving wastewater treatment, residential or industrial problems. Design, build and operate facilities.
- http://wastewaterpe.com/

Treatment Systems Ltd.
- A specialist engineering company focused on the area of water and wastewater treatment systems.
- http://www.treatmentsystems.ie/

Agri-Waste Technology, Inc.
- Providing phase 1 study, waste management systems, permits for sludge, soil suitability tests, irrigation system design, waste utilization plans, expert witness, waste water and related services.
- http://www.agriwaste.com/

NETCSC
- Offers drinking water and innovative, alternative wastewater and solid waste training for small, rural community officials to help protect public health and the environment.
- http://www.netc.wvu.edu

Schreiter Engineering Associates, Inc
- Consulting engineering firm specializing in the water and wastewater treatment field including planning, design, construction management, NPDES permitting assistance, and WWTP operations assistance.
- http://www.schreiterengineering.com/

Naston Limited
- UK based wastewater engineering and contracting firm describes its capabilities and its water treatment projects in several African countries.
- http://www.africa-water-projects.com/