Solutions
Environmental challenges cross borders and communities, affecting neighborhoods and nations. We apply systems thinking, using data at the edge of science to guide each project toward a responsible path forward.
Contaminated Land & Remediation
Proven strategies to assess, remediate, and restore contaminated sites for safe, sustainable reuse
Permitting & Compliance
Helping you meet regulations and simplify permitting with confidence
Planning, Preparedness, Response & Recovery
Building readiness for decisive environmental action
Health, Safety & Chemistry
Scientific and regulatory expertise to support organizations managing complex EHS risks and strengthen environmental compliance.
Testing & Analysis
Delivering accurate environmental data that organizations need to operate with confidence
Water Consulting, Testing & Treatment
Innovative testing and treatment solutions to protect water quality, manage risk, and ensure sustainability
Community Resiliency
Helping organizations adapt to climate risks with forward-looking strategies that build resilience
Natural Resources
Enabling progress that protects natural systems
Treatment Technologies
Treatment systems designed, built, installed and operated for PFAS and other complex contaminants
Case Studies
Rebuilding Highway 8 for a Changing River
See how Onterris helped rebuild Highway 8 along the Nicola River with climate-resilient bridge design, hydrotechnical engineering and habitat enhancements.
Flexible Modular Leachate Treatment for Greater Operational Control
Integrated engineering and full-service operations provides an adaptable treatment pathway for changing site conditions and evolving requirements
A Smarter Air Permitting Strategy for a Texas Refinery
Strategic planning creates a more efficient permitting pathway and keeps critical refinery modernization on schedule
Keeping Sydney Metro West Tunnelling On Track With Audit-Backed Environmental Delivery
A multi-site investigation, remediation and validation program aligned with NSW EPA accredited Site Auditor review cycles enables construction teams to progress safely and confirm site suitability
Validating PFAS Destruction for Cleantech Innovator Aquagga
Advanced analytical approach verifies PFAS destruction in complex samples
Accelerating Remote Groundwater PFAS Treatment with Modular Systems
Compact deployment, remote operation and a reliable treatment design supported consistent PFAS treatment across six groundwater sites
Real-Time Benzene Source Detection for Refinery Emissions
Mobile PTR-TOF-MS monitoring helped a refinery pinpoint benzene emission sources in days, accelerate corrective action and strengthen regulatory confidence.
Delivering A PFAS Treatment Solution For Sydney Water
Rapid PFAS treatment deployment enables Australia’s largest water utility to meet drinking water guidelines and build community trust
Restoring A Critical Southwest Rail Corridor Through Decision-Grade Air Monitoring
A coordinated response paired continuous field intelligence with practical execution to guide evacuation decisions, protect crews and support the staged reopening of a critical freight and highway corridor
Building a Scalable Environmental, Health and Safety Operating Model Across a Growing Data Center Portfolio
Environmental health and safety consulting and software delivery stayed tightly aligned, giving the client a clearer path from evaluation to execution
Pioneering Sustainable Energy Transition, Protecting Wildlife: Saint Elmo Vanadium Mining Project
Sustainable mining advanced through integrated approvals, community stewardship and innovative Julia Creek Dunnart research
Strengthening Superfund Data Confidence Through Chemist-Led Validation
Early chemist review proactively elevated data quality by confirming that automated quality control matched the method intent, a step beyond standard practice, adding an extra layer of assurance
Strengthening GHG Reporting for a Growing Midstream Operator
A repeatable, EPA-aligned quality gate routes exceptions to the right owners and benchmarks performance against public industry data
Protecting Drinking Water for Pender County: Turning PFAS Uncertainty Into a Long-Term Plan
Creating a reliable testing and treatment roadmap that supports capital planning for long-term safe drinking water
Decommissioning a Legacy Textile Site With Reliable PFAS Wastewater Treatment
Reliable commissioning and remote support maintained steady treatment performance in complex lagoon water as the site progressed toward closure