OHE is a Canadian company with the head office located in Mississauga, Ontario, a branch office in Ottawa, Ontario and a network of associate companies strategically located in major centers across Canada. OHE’s ability to establish and maintain such associations enables it to provide its national clients with efficient and consistent quality service across Canada. OHE is a multidisciplinary firm that specializes in providing high quality services in the field of environmental and health and safety consulting. OHE has provided such services to a wide base of clientele including financial institutions, property management groups, retail companies and shopping malls, manufacturing industries, government agencies and health care and research facilities, insurance and legal clients.

The many consulting services offered by OHE include occupational and environmental hygiene, environmental assessments, asbestos and building hazardous materials management and control, indoor air quality, building microbiological contamination management and control, environment and health and safety training and the development and implementation of environmental and health and safety management systems. Additional specialty engineering services include risk management, forensic engineering, confined space management and water/wastewater engineering, pollution prevention and auditing.

To ensure the protection of our clients interests at all times, OHE carries multi-million dollar Commercial General Liability Insurance and Errors and Omissions Insurance including Pollution Coverage. This coverage includes OHE's own work and that performed by its sub-consultants.