| Alleco: Specializes in consultancy for marine biology and fresh water research and education. Services include nature mapping, impact assessments, scientific diver training, nature exhibitions, and naturalizations of man-made shores. Based in Finland. |
| Ambicat Consulting: Independent consultant firm in the treatment and management of water, environmental and chemical Products. |
| Australian Water Quality Centre: South Australia government organization offers a wide range of water and environmental health analytical and research services relating to water and the environment. |
| Baxter and Woodman, Inc.: Consulting engineers offering services in water, wastewater, and related civil engineering areas. Illinois and Wisconsin. |
| Campbell and Associates: Provides full-service consulting to industry and the legal community in hydrogeology, water supplies, contaminant transport, and litigation support. |
| Cedar Eden Environmental, LLC: An environmental consulting company specializing in lake and watershed management, water quality monitoring, geographic information systems, and environmental web design services based in Saranac Lake, NY. |
| CR Environmental, Inc.: Providing oceanographic consulting services including: research/survey vessels, geophysical surveys, sampling, wetland restoration, risk assessment, bioassessment, and licensed vessel captains. WBE. MA and NY. |
| Downstream Strategies: Evan Hansen offers technical analyses on water quality and water resources matters, for watershed groups, environmental organizations, consulting companies, and government agencies. Describes projects and provides publications for download. Based in West Virginia, USA. |
| Environmental Hydraulics Group Inc.: Engineering consultants for fluid transients (steam or waterhammer), water and wastewater systems, forensic and expert witness services, river and coastal engineering, water treatment plant hydraulics, and related regulatory compliance. Ontario, Canada. |
| Environmental Rate Consultants, Inc: Financial consultant specializing in storm water utility development. |
| Forgotten Rain L.L.C.: Fee based rainwater harvesting, stormwater reuse, and rain garden design and consulting. |
| Hydrologic Solutions: Small consultancy providing expertise in hydrology to solve problems in water resources such as water allocation issues, climate change impacts, land use changes and environmental issues. Specialists in hydrological modelling. Worldwide experience. |
| Innovative Water Solutions, LLC.: A rainwater harvesting and graywater recovery system design and consulting firm located in Austin, Texas. |
| Integrated Resource Management Research Pty. Ltd.: Offers information and consultancy advice on integrated catchment (watershed) management, river basin management and integrated water resources management. Based in Australia. |
| JNE & Associates, Inc.: Environmental/ecological consulting firm emphasizing coastal and aquatic habitats. Wetlands delineations, environmental impact assessment, soils and groundwater assessment, monitoring. San Diego, California. |
| Land & Water Consulting, Inc.: Montana firm offers environmental services in the areas of groundwater, surface water, soils, wetlands, environmental site assessments, vegetation, and water rights. |
| Lion Consultancy Services: UK firm providing water consumption management services and sewer surveys. |
| Lytle Water Solutions LLC.: Specializes in surface water, ground water, water quality assessments, water rights, expert testimony, and environmental studies. |
| McGuire Environmental Consultants, Inc.: Providing services to the municipal and private water utility market in the areas of water quality and water treatment. Located in Santa Monica, California. |
| Natural Channel Design, Inc: An engineering firm located in Flagstaff, Arizona. Specializing in river and stream research, assessments and restoration. |
| Oasis Design: Providing ecological systems for water supply, and wastewater treatment and re-use. Includes background information on grey water, as well as articles, press releases, and books for sale. Based in California. |
| Oceanica Consulting Pty Ltd: Environmental consultants specializing in marine, coastal and estuarine science. Based in Perth, Western Australia. |
| Paul Garrad Associates: UK based water and environmental consultant. Describes expertise, including hydrology, hydrogeology, river modeling, and water quality modeling; offers services in these technical areas, EIA, expert witness, and project management. |
| Resources and Systems International: Consulting, modeling, and software for watershed management, analysis of transport in soil and groundwater systems, and water resources planning and management. Offices in Blacksburg, Virginia. |
| Riverbank Conservation Limited: UK based company offering green engineering, environmental and erosion control solutions for rivers and lakes using willow spiling. |
| Robert Bray Associates: Landscape architect offering consulting on sustainable drainage, an environmentally friendly way of dealing with surface water runoff which avoids problems of current drainage practice. Located in Gloucestershire, UK. |
| S.S. Papadopulos and Associates, Inc.: Offers professional water-resource and environmental consulting services, including groundwater contaminant studies, remediation, geochemistry, and surface-water hydrology. Offices in U.S. and Canada. |
| SAUR: Water supply and analysis, environment and ecology services. |
| Shaw Engineering: Small Nevada-based civil engineering firm which specializes in water and wastewater treatment, collection, distribution and disposal. Site includes information and links about a variety of water resources and wastewater topics. |
| Stormwater Services Group, LLC: Consultant providing NPDES discharge permitting and compliance services to industry and municipalities. Site includes information about U.S. stormwater management requirements and other water quality topics. |
| Turo Technology: Multiparameter water quality analysers. Sensors include temperature, dissolved oxygen, depth, pH, conductivity, salinity and turbidity. |
| Vital Resource Management: Provides consulting services and systems for the pre-treatment of waste water in both large council systems and domestic applications. |
| Water and Environment: Consultant for international water and environment projects, based in Spain. |
| Water Environment International: Consulting services on water environment aspects of international development, focusing especially on Asia (Bangladesh and Vietnam) and Africa. Describes staff and projects and provides related internet links. |
| Water Resource Solutions, Inc.: Specialties include aquifer storage and recovery, injection well services, groundwater supply development, wellfield design and rehabilitation, and development of reverse osmosis feedwater systems. Florida, U.S.A. |
| Water Rights, Inc.: Qualifications and contact information for water engineering consultant offering technical advice and expert witness services on water resources and water rights. Based in Washington State, U.S. |
| Water Tech International: Provices water conservation and water management consulting and training. Also provides engineering HVAC engineering and systems. Site includes information on services and client data. |
| Water's Edge Scientific LLC: Environmental consulting firm specializing in biological aspects of water quality, including studies of macroinvertebrates, zooplankton, and algae. |
| Woods Hole Group: Consultants in the areas of coastal engineering, oceanography, numerical modeling, data collection and analysis, fate and transport of chemically contaminated sediments. |
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