EWS provides equipment and services to a variety of companies serving the industrial and municipal water and waste water markets in California and Western Nevada:
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| Aecom | AeroJet, a GenCorp Company, Inc. | AMEC Egomatrix | Auburn Constructors Inc |
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| Berkeley Farms | Black & Veatch | Bottle Rock Power, LLC | Brown and Caldwell Environmental Engineers & Consultants |
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| CDM Consulting Engineering Construction Operations | Carollo Engineers Working Wonders With Water | CH2MHILL | The City Of Atwater |
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| Combined Solar Technologies | Eastern Municipal Water District | HDR | HydroScience Engineers |
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| Jackson Rancheria Casino & Hotel | Lyles Construction Group | Musco Family Olive Co. | Overaa Building |
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| Provost & Pritchard Consulting Group | The Metropolitan Water District Of Southern California | Quad Knopf | RGW |
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| Thunder Valley Casino | Valero |
