| 3M Filtration Products |
| aba Water Systems Inc. |
| ABB Kent Meters, Inc. |
| A-Certi-Pure Drinking Water Systems |
| AES Inc. |
| AF Equipment Co., Inc. |
| ATP Manufacturing Ltd. |
| avenir software Inc. |
| A.R.C. Distributors |
| AWT-Adavanced Water Technologies |
| Absolute Custom Extrusions Inc. |
| Acra Electric Corp. |
| Action Manufacturing & Supply Inc. |
| Addie Water Systems Inc. |
| Addlife Products Co. Inc. |
| Advanced Electronic Products, Inc. |
| Advanced Membrane Technology, Inc. |
| Advanced Structures, Inc. |
| Advanced Water Systems, Inc. |
| Air & Water Purification Inc. |
| Air Gap International, Inc. |
| AirSep Corporation |
| Alamo Water Refiners, Inc. |
| Alan Manufacturing |
| Aldex Chemical Co., Ltd. |
| All-Flo Pump Co. |
| Alpine Softener Corp. |
| Ambient Technologies, Inc. |
| Amera Trail, Inc.Water Products Div. |
| American Aquasciences |
| American Dispensing Co. |
| American Engineering Services, Inc. |
| American Equipment Leasing |
| American Minerals |
| American Resin Corp. |
| American Ultra Lamp Co. Inc. |
| American Ultraviolet Co. |
| American Water Service |
| American Water Technologies |
| Americana Sales Ventures, Inc. |
| Ametek, Inc. |
| Amiad Water Systems Technologies |
| Amtrol Inc. |
| Amy Controls, Inc. |
| Analytical Services, Inc. |
| Anatel Corp. |
| ANGUS Chemical Co. |
| Applied Computer Techniques |
| Applied Membranes, Inc. |
| Applied Ozone Technologies, Inc. |
| Applied Water Engineering, Inc. |
| Aqua Care Systems, Inc. |
| Aqua Man Inc. |
| AQUA PRO MEMBRANES |
| Aqua Products Inc. |
| Aqua Prification Systems |
| AQUA STAR International |
| Aqua Systems Inc. |
| Aqua Tech Environmental Laboratories, Inc. |
| Aqua Treatment Services Inc. |
| Aqua-Chem, Inc. |
| Aqua-Fi USA, Divi. of Comlease |
| AQUA-FLO, Inc. |
| Aqua-Freshe |
| Aqua-Life Corp. |
| Aqua-Tronics, Inc. |
| AQUABASE |
| AQUACELL INTERNATIONAL, INC. |
| Aquafine Corp. |
| Aquaflow Pump & Supply Co. |
| AQUACLIP |
| Aquamatch, Inc. |
| Aquamatic Inc. |
| Aquanetics Systems, Inc. |
| AQUAPURA Corp. (The) |
| AQUApura-Tempest Environmental Systems, Inc. |
| Aquatec Water Sytems, Inc. |
| Aquathin |
| Aquest, Inc. |
| Arc Water Treatment Co. of MD, Inc. |
| Argo Scientific |
| Arizona Instrument Corp. |
| Arizona Water Vendors |
| Arrow Industries |
| Ashland Chemical Co. Drew Industrial Div. |
| Astro-Purewater Purifiers |
| Atlantic Filter Corp. |
| Atlantic Ultraviolet Corp. |
| Atomergic Chemetals Corp. |
| Automatic Switch Co. |
| AutoPilot Systems Inc. |
| Azco Industries Ltd. |
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