- Altech Group, The
 - Toronto - Environmental management consultants, engineers, geologists, and scientists providing integrated solutions for business and the environment. - Envirotest Inc.
- Toronto - Environmental and occupational hygiene services.
- Gartner Lee Limited
- Markham - Providing planning, waste management, environmental site assessment and remediation services.
- Markland Specialty Engineering, Ltd.
- Toronto - Manufactures automatic sludge blanket level controls, manual level detectors, and sludge density suspended solids meters.
- SENES Consultants Limited
- Richmond Hill - Provides pollution control services ranging from acid mine drainage to air emissions. Also offers solid and hazardous waste management services.
- Turtle Island Recycling
- Toronto - Multi-material recycling and waste removal company.
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