- Advanced Environmental Systems, Inc.
 - Elkton - Manufacturers of catalytic and thermal, recuperative and regenerative VOC oxidizers; and fiberbed diffusion filter mist collection systems. - Brightwater, Inc.
- Ellicott City - Specialising in water quality studies, stream assessment and restoration, wetland assessment, restoration and mitigation.
- Environmental Elements Corporation
- Baltimore - Designs and supplies electrostatic precipitators, fabric filters, and gas and particulate scrubbing systems.
- Fleet OM&M Manager
- Baltimore - Operations monitoring and maintenance manager application allows restricted Internet access to information about a site's remediation and monitoring progress.
- Gascoyne Laboratories
- Baltimore
- Industrial Chemical Corporation
- Baltimore - Equipment and chemicalt treatments for boilers, cooling towers, closed loops, and commercial domestic systems for scale, corrosion, and biological fouling.
- Watermark Corporation
- Baltimore - Water quality improvement products and services.
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