Environmental Due Diligence

Tetra Tech provides comprehensive technical and environmental due diligence (EDD) services to support clients through mergers and acquisitions (M&A), property transactions, and redevelopment projects. With decades of global experience, we help investors, developers, and asset managers identify environmental liabilities, evaluate compliance risks, and develop strategies that protect value and meet regulatory requirements.

Our specialists, backed by global reach and a bench of trusted partners, apply a rigorous, Leading with Science® approach to uncover environmental issues early. We deliver prompt, clear, and actionable advice to provide a high rate of return by adding tangible value to our clients’ business transactions. Whether you are buying, selling, refinancing, or managing property or infrastructure assets, our bespoke EDD services enable robust decision-making and support long-term asset value.

Phase I Environmental Site Assessments

We conduct thorough Phase I Environmental Site Assessments (ESAs) according to local regulations and best practice, to identify potential or existing environmental liabilities associated with a site or portfolio of sites.

• Historical site use review and regulatory database checks
• Site walkovers to observe conditions and operations
• Interviews with owners, occupants, and regulators
• Clear, risk-based reporting aligned with local and international standards
• Bespoke scoping integrated with engineering, planning, and health and safety
• Concise practical advice and prioritised solutions

Phase II Intrusive Investigations

When Phase I findings indicate potential contamination, we design and implement targeted Phase II site investigations.

• Soil, groundwater, and vapour sampling and analysis
• Assessment of PFAS and emerging contaminants
• Site-specific conceptual site model development
• Quantitative risk assessments with regard to human health and environmental receptors
• Regulatory liaison and remediation advice

Environmental Compliance Auditing

Tetra Tech helps clients assess current operations against environmental and health and safety (EHS) regulations and best practices. We bring decades of experience in major sectors such as pharmaceuticals, light and heavy industry, residential and student accommodations, healthcare, food manufacturing, and regeneration and mixed-use developments.

• Multi-media compliance audits (air, water, waste, noise)
• Evaluation of permits, procedures, and documentation
• Gap analysis and compliance action planning
• Post-audit support and training

Portfolio and Multisite Due Diligence

We deliver strategic insight across multiple sites or asset portfolios, tailoring services to client risk profiles, budgets, reporting requirements, and timelines.

• Scalable, consistent EDD programmes for property portfolios
• Data management and geographic information systems (GIS) mapping for rapid review
• Cross-border coordination with multilingual teams
• Reporting dashboards for investor or board use

ESG and Climate Risk Assessment

We integrate environment, social, and governance (ESG), and climate-related considerations into due diligence workflows to align with stakeholder expectations.

• Physical and transition risk assessments for climate change
• Screening for biodiversity, water stress, and natural hazards
• Assessment of ESG liabilities and opportunities including alignment with carbon reporting regulations and energy minimum standards
• Integration with corporate sustainability strategies