Name

Terraphase Engineering

Legal name

Terraphase Engineering Inc.

Website

https://terraphase.com

Company type

Private

Founded year

2010

Operating status

Operating

Headcount range

101–250 employees

Ownership category

akta.pro rank

Product category

Environmental Consulting Services

NAICS

Environmental Consulting Services (54162), Engineering Services (54133), Environmental Consulting Services (541620)

SIC

Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Geotechnical & Subsurface Engineering Consulting (BPAHAIAB)

akta.pro secondary industries

Civil & Structural Engineering Consulting (BPAHAIAA), Geotechnical Design, Engineering & Consulting (Analysis, Design, Peer Review) (IMAFAOAK)

Keywords

• Environmental consulting services
• Site remediation engineering
• Water resource management
• Environmental due diligence
• Geotechnical engineering services

Headquarters

HQ city

Oakland

HQ country

United States

HQ region

North America

Offices18 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Environmental Consulting Services: Professional services revenue generated through project-based engagements for environmental consulting, site assessment, remediation design, compliance services, water resources, and site engineering. Projects are typically scoped and quoted based on client needs, regulatory requirements, and project complexity.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Terraphase Engineering is a national environmental consulting firm that delivers professional engineering and science services across four core practice areas: Environmental Services (due diligence, site characterization, remediation), Compliance Services (regulatory interpretation, permitting, auditing, litigation support), Water Services (water rights, stormwater, drinking water, flood control), and Site Engineering Services (civil, geotechnical, and construction management). Engagements are project-based and serve industrial, government, energy/utilities, real estate, tribal, legal, and insurance/finance clients across the United States.

Product overview

Terraphase Engineering is an environmental consulting firm offering a comprehensive suite of services organized into four core service areas: Environmental Services, Compliance Services, Water Services, and Site Engineering Services. These core services encompass numerous specialized sub-services including Due Diligence, Site Characterization, Remedial Design and Implementation, Vapor Intrusion Assessment and Mitigation, PFAS Services, Data Visualization and Technology Services, Human Health and Ecological Risk Assessment, Environmental Portfolio Advisory Services, Litigation Support, Industrial Hygiene Services, NEPA/CEQA Services, Air Quality Compliance, Tanks and Spill Prevention Planning, Stormwater Services, Drinking Water Quality Compliance, EMS and Auditing Services, Hazardous Waste and Materials Compliance, Water Rights, Water Well Services, Wetlands Planning and Design, Flood Control and Drainage, Sea-Level Rise Vulnerability Assessments, Post-Fire Response, Civil Design, Geotechnical Engineering, Construction and Project Management Services, and Fate and Transport Modeling. The firm serves diverse market sectors including Industrial, Government, Energy and Utilities, Real Estate, Tribal, Legal Support, and Insurance and Finance.

Differentiator

Problem solved

Functional benefit

Products and services

• Environmental Services Environmental consulting services including due diligence, site assessment, and remediation solutions to navigate complex regulatory environments for public and private clients.
• Compliance Services Expertise in risk assessment, regulatory interpretation, permitting, auditing, litigation support, and training to help clients function responsibly and enhance environmental stewardship.
• Water Services Comprehensive water resource management services for public and private clients nationwide, including water rights, regulatory compliance, and tailored engineering solutions.
• Site Engineering Services Civil engineering, geotechnical engineering, and construction project management services applying advanced technologies to complex programs.
• Due Diligence Phase I Environmental Site Assessments (ESAs) in accordance with ASTM E1527-21 standard to assess potential liabilities and provide release of liability under CERCLA.
• Site Characterization Innovative site investigations supporting clients in making informed decisions and achieving regulatory compliance for soil, soil vapor, groundwater, and sediment contamination.
• Remedial Design and Implementation Design and implementation of effective remediation solutions including containment, ex-situ and in-situ treatment for multi-media contaminant mitigation.
• Vapor Intrusion Assessment and Mitigation Comprehensive vapor intrusion assessment and mitigation services including soil gas, sub-slab, and indoor air sampling, modeling, and mitigation system design.
• PFAS Services PFAS investigation, forensic source identification, risk assessment, compliance, and remediation services for emerging contaminants.
• Data Visualization and Technology Services Geospatial analytics, drone and sensor technologies, interactive visualizations, and Python automation for environmental data interpretation and decision-making.
• Human Health and Ecological Risk Assessment Tailored risk assessment and risk management services evaluating human health and ecological risks for contaminated sites and unique exposure scenarios.
• Environmental Portfolio Advisory Services Strategic environmental advisory services to private equity firms and institutional investors throughout the investment lifecycle.
• Litigation Support Expert witness services including expert reports, depositions, mediation support, and testimony for environmental legal matters.
• NEPA/CEQA Services California Environmental Quality Act and National Environmental Policy Act compliance, impact analysis, mitigation strategies, and environmental documentation.
• Air Quality Compliance Air permitting, emissions calculation and reporting, facility compliance, and ESG/sustainability support for diverse market sectors.
• Stormwater Services Industrial, construction, and municipal stormwater compliance support including permit preparation, sampling, corrective action planning, and green infrastructure design.
• Drinking Water Quality Compliance Lead and PFAS testing, potable water system management, well sampling, permit support, and compliance monitoring database development.
• Water Rights Water rights consulting, groundwater modeling, impairment assessments, and mitigation plan development for new and change water right applications.
• Water Well Services Well design, drilling oversight, testing, rehabilitation planning, wellhead protection, hydrogeologic studies, and groundwater modeling.
• Wetlands Planning and Design Wetland resource and sediment management strategies, wetland creation/enhancement designs, and Clean Water Act Section 401/404 compliance support.
• Flood Control and Drainage FEMA map revisions, hydrologic and hydraulic studies, flood protection planning, and scour and stabilization analysis and design.
• Sea-Level Rise Vulnerability Assessments Climate change adaptation and SLR vulnerability assessments for contaminated sites, wastewater facilities, and shoreline-adjacent areas.
• Post-Fire Response Rapid post-fire assessments, risk prioritization, and mitigation planning using satellite imagery, GIS mapping, UAVs, and erosion control best management practices.
• Civil Design Feasibility assessments, design analyses, and construction-ready documents for site development, stormwater facilities, wetlands, and water/wastewater treatment.
• Geotechnical Engineering Geotechnical feasibility studies, slope stability analysis, seismic hazards evaluation, foundation design, ground improvement, and retaining wall design.
• Construction and Project Management Services Planning, managing, and constructing multi-disciplinary projects through design-bid-build, design-build, CMAR, and EPC delivery methods.
• Fate and Transport Modeling and Hydrogeologic Assessment Quantitative analysis of groundwater flow and contaminant transport using analytical and numerical models including MODFLOW, MT3D, and HYDRUS.
• Tanks and Spill Prevention Planning End-to-end support for aboveground and underground storage tanks including SPCC plans, facility response plans, tank integrity inspections, and regulatory reporting.
• Industrial Hygiene Services Hazardous building material surveys, abatement support, mold assessments, indoor air quality testing, and facility operation and maintenance plans.
• Hazardous Waste and Materials Compliance Hazardous waste characterization, RCRA compliance, waste exemptions, audit support, and hazardous materials management including CalARP and RMPs.
• EMS and Auditing Services Multimedia regulatory compliance support, compliance audits, internal management system audits, and environmental policy and SOP development.

Quantifiable outcome

• Completed environmental due diligence on multiple manufacturing sites across 5 states and Mexico on expedited schedule
• +2 more outcomes

Named customers7 records

Segments7 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Two partnerships are on record, tiered major and core.

• BrightFields, Inc.majorStrategic or Co-development Partner · 21 November 2025Strategic merger/acquisition expanding Terraphase's Mid-Atlantic presence. BrightFields brings expertise in Delaware Hazardous Substances Cleanup Act compliance, sediment remediation, water supply work, environmental demolition, and asbestos and lead management. BrightFields will continue operating under its existing brand during a transition period, with co-founders Marian Young and Mark Lannan retaining leadership roles.
• Eolas Environmental, LLCcoreStrategic or Co-development Partner · 30 October 2025Acquisition strengthening Terraphase's environmental consulting capabilities in Connecticut and Massachusetts. The acquisition allows Terraphase to expand its regional presence and enhance services in site investigation, remediation, and regulatory compliance.

Scale indicators3 records

Recent moves5 records

Expansion highlights6 records

Broad incumbents

• AECOM: Global engineering and environmental services firm offering site assessment, remediation, water, and geotechnical services. Directly comparable to Terraphase across environmental, compliance, water, and site engineering, but at much larger scale and with broader geographic and program-management capabilities.
• Tetra Tech: Leading environmental and engineering consulting firm with deep expertise in water resources, environmental assessment, and remediation. Highly comparable to Terraphase across environmental due diligence, water rights, and site characterization, with substantially broader geographic reach.
• Jacobs Solutions: Major global engineering and environmental services provider offering site investigation, remediation, water, and geotechnical services. Overlaps with Terraphase across nearly all four service pillars, though operating at multi-billion-dollar scale.
• WSP Global: Global professional services firm with strong environmental, water, geotechnical, and site engineering practices (including via Golder Associates). Directly competes with Terraphase in environmental due diligence, remediation design, and water resources.
• Arcadis: International design and consultancy firm with substantial environmental remediation, water, and resilience practices. Comparable to Terraphase in PFAS, brownfield redevelopment, climate adaptation, and compliance services.
• Environmental Resources Management (ERM): Largest pure-play global environmental consultancy offering EHS compliance, site investigation/remediation, and sustainability advisory. Comparable to Terraphase across industrial due diligence, remediation, and PE portfolio advisory work.

Direct peers

• Haley & Aldrich: Privately held environmental and geotechnical engineering consultancy with similar service mix to Terraphase — site characterization, remediation, compliance, and geotechnical engineering — and a comparable multi-office US footprint.
• Roux Associates: Environmental consulting and remediation firm offering site investigation, remedial design, litigation support, and environmental due diligence. Closely comparable in service mix, scale, and licensing-driven delivery model.
• Brown and Caldwell: Environmental engineering and consulting firm focused on water, wastewater, and stormwater — directly overlapping with Terraphase's Water Services practice and stormwater compliance work.
• TRC Companies: US-focused engineering, environmental, and construction management firm with strong practice in environmental remediation, compliance, water, and energy transition services. Closely comparable to Terraphase's vertically integrated environmental/site engineering model.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/terraphase-engineering-inc-

Revenue estimate

Valuation estimate

Number of profiles

Profiles20 records

Subsidiaries2 records

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A2 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Terraphase Engineering