Diomides & Associates Pty Ltd was established in 1993 in response to a rapidly growing demand for professional, specialist environmental consultants - to address specific environmental issues - particularly those associated with the environmental assessment and remediation of contaminated sites throughout Melbourne and Victoria. Our company provides clients with the benefit of over forty-five years of environmental management and environmental consulting experience, is widely recognised as a leading company of site contamination specialists for the assessment and remediation of contaminated soil and groundwater, and are well known experts in this field.

We are a small business operating throughout Melbourne and Victoria which is highly regarded for its emphasis on professionalism, confidentiality, efficiency, and excellence in the quality of its specialist environmental consultant services. Unlike the majority of our competitors, our company is a small, specialised, and totally Victorian owned and operated company with all its assets and profits remaining in Victoria. We provide a personalised consulting service to each of our clients and we find that our fees are significantly more competitive than those of large, overseas based consulting companies.

In servicing our clients, we monitor the rapidly changing issues, requirements and regulations concerning site contamination, environmental audits, and other environmental issues, and we advise our clients on the most efficient and effective options and solutions, and on the implications of current and proposed legislation in Victoria.

Our company has been a member of the Australian Contaminated Land Consultants Association in Victoria since ACLCA (Vic) was founded in 2001, is a recognised member on the environmental panels of most banks and financial institutions in Australia, and is fully backed with professional indemnity insurance for $10M and public liability insurance for $20M. Our company was the Winner of the 2005 (UDIA) Urban Development Institute of Australia (Victoria) Excellence Award - Environmental Consultant for Urban Renewal Projects.


Stephen is the Principal Director of Diomides & Associates Pty Ltd. He is an environmental scientist with over 35 years experience in environmental management and pollution control including 16 years of professional EPA experience in Victoria, and extensive experience and expertise as an environmental specialist in the assessment and clean up of contaminated land. He is a certified Lead Environmental Auditor for environmental compliance and contaminated site audits - Registration No. 14079 on the RABQSA Register of Certified Auditors. This certification has national and international standing. As Principal Director, Mr Diomides has executive responsibility for all projects undertaken by Diomides & Associates, and his role in the company is in the planning and management of contamination assessment, site remediation, and environmental audit projects throughout Australia. He is engaged as project manager and consultant for contamination assessment and clean-up projects of all types involving current and former industrial sites including oil storage sites, gasworks, chemical works and electroplating workshops. He is also engaged in liaising and negotiating with EPA and other Government agencies, and the provision of expert evidence for VCAT hearings and various court cases.


Costa Diomides is a director and a senior environmental scientist with Diomides & Associates Pty Ltd. He has gained many years of professional experience as an environmental scientist and has extensive experience in the environmental consulting field since joining the company in 2001. He is an environmental specialist in contaminated site assessments, site groundwater investigations, site remediation management projects and has been involved in numerous EPA environmental audit projects. Costa has also been involved in numerous site remediation and site cleanup projects which in many cases have also been part of the EPA statutory environmental audit process. As a Director and Senior Environmental Scientist, Costa’s role is in the planning and management of contamination assessment, site remediation, and environmental audit projects throughout Victoria involving numerous current and former industrial sites including manufacturing sites, oil industry sites, gasworks, transport depots, warehouses, dry cleaning plants, plant nurseries and school sites.