A Doctor of Philosophy (PhD) in Environmental Remediation is Australia's highest academic qualification in this field, sitting at Level 10 of the Australian Qualifications Framework. It is a research-intensive degree in which candidates design, conduct, and report on an original, independent research project that makes a substantive contribution to human knowledge in environmental remediation science, engineering, or policy. Research areas typically span contaminated land and groundwater assessment, bioremediation, chemical and physical treatment technologies, soil remediation, sediment management, mine-site rehabilitation, per- and polyfluoroalkyl substances (PFAS) remediation, risk assessment, and emerging pollutant science. The degree is normally completed over three to four years of full-time study, culminating in a substantial thesis of up to 100,000 words that is examined by no fewer than two independent, internationally recognised examiners.

This qualification is designed for high-achieving graduates who wish to become leading experts, researchers, or innovators in environmental remediation. It suits those with a strong background in environmental science, environmental engineering, chemistry, geoscience, or public health who want to push the boundaries of knowledge in contaminant science, remediation technology, or environmental risk management. Candidates work under the direction of expert supervisory panels and gain deep expertise in laboratory analysis, field investigation, data modelling, and scientific communication. Employers of PhD graduates in this field include federal and state government agencies such as the EPA and CSIRO, environmental consulting firms, mining and resources companies, infrastructure developers, water utilities, local councils, defence organisations, and universities.

Admission to a PhD in Environmental Remediation in Australia is competitive and typically requires a bachelor's degree with Honours (First Class or upper Second Class, i.e. H1 or H2A) in a relevant discipline such as environmental science, environmental engineering, chemistry, geoscience, or public health. Most Australian universities also accept applicants holding a master's degree that includes a substantial research component — typically equivalent to at least 25% of a full-time academic year — with a distinction or high distinction average. Some institutions may also consider an equivalent combination of qualifications, peer-reviewed publications, and relevant professional experience in contaminated land or environmental science. Applicants are generally required to identify and make contact with a prospective supervisory academic before applying, as admission is subject to supervisory capacity and availability of appropriate infrastructure and research resources. A strong research proposal outlining the intended research project, its significance, methodology, and alignment with the supervisor's expertise is commonly required.

For international applicants, English language proficiency must be demonstrated, typically through an IELTS overall score of 6.5 or above with no individual band score below 6.0, or an equivalent result in tests such as TOEFL, PTE Academic, or Cambridge English. Applicants who have completed a degree taught entirely in English at a recognised institution may be exempt. Additional supporting documents typically required include certified academic transcripts, a curriculum vitae listing relevant publications, conference presentations, awards, and research experience, a cover letter or research statement, and the contact details of at least two academic referees. Some programs, particularly those with an industry or public health focus, may also value demonstrated professional experience in environmental consulting, government regulation, or laboratory science.