- ADS Environmental Services
- Abbott Laboratories
- Accutest Laboratories
- Air Toxics Limited
- Alpha Analytical
- American Council of Independent Labs
- American Water Works Company
- Aqua-Aerobic Systems
- Aquatech International Corporation
- Arcadis NV
- Battelle Labs
- Brown and Caldwell, Inc.
- Brown and Root
- Camp Dresser & McKee
- Clayton Group Services
- Corning, Inc.
- Dionex Corporation
- Dow Chemical
- Dresser, Inc.
- Dupont
- EA Engineering, Science & Technology
- EQ Company
- Ecology & Environment
- EnergySolutions
- Entact, Inc.
- Envirogen Technologies, Inc.
- Environmental Business International
- Environmental Capital Network
- Environmental Chemical Corporation
- Environmental Science & Engineering
- Esterline Technologies
- General Electric Company
- Geoprobe Systems
- Georgia Pacific
- Golder Associates
- Gulf Coast Analytical Laboratories
- Hewlett Packard
- Hydrosphere Resource Consultants
- Illinois Tool Works/Filtertek
- Intertek Testing Services
- ITT Industries
- Industrial Bank of Japan
- Jain Irrigation
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- KRG Capital Partners LLC
- Kemper Risk Management Services
- Kemron Environmental Services
- Kleiner Perkins Caufield & Byers
- Kohlberg and Company
- Laidlaw Environmental Services, Inc.
- Lindsay, Goldberg & Bessemer
- MACTEC, Inc.
- Metcalf & Eddy
- Millipore Corporation
- Monsanto Corporation
- Motorola
- MWH Global
- Northwest Pipe Company
- Norwest Venture Capital
- O'Brien & Gere
- Odyssey Investment Partners
- Orica, Inc.
- Pace Analytical Services
- Pentair Corporation
- Permafix Environmental Services
- Portland General Electric
- Republic Financial
- S.M. Stoller Corporation
- Safety-Kleen
- SEA Consultants, Inc.
- Sevenson Environmental Services
- Severn Trent Services
- SGS, Inc.
- Sharp Laboratories of America
- South Carolina Electric and Gas
- Stablex, Inc.
- Stonehenge Partners/3Stone Advisors
- Summit Global Management, Inc.
- Tektronix
- Terracon, Inc.
- Vaisala Oyj
- Versar, Inc.
- W.L. Gore & Associates
- Water Quality Association
- Waterlink, Inc.
- Weston Solutions, Inc.
- YSI, Incorporated
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