What Duffield Associates does

Duffield Associates operates as an integrated environmental science and engineering platform that delivers multidisciplinary professional services to infrastructure, energy, water, government, and industrial clients. Core service lines include Environmental Science Solutions (environmental assessment and remediation, CERCLA/RCRA and multiparty remediation, environmental health and safety, natural resources and environmental planning, and sustainability advisory) and Engineering Solutions spanning architecture, automation engineering, digital technologies, electrical, geotechnical, hydrology/hydraulics, mechanical, site and roadway civil engineering, structural, surveying, and water/wastewater systems engineering. Three "Key Differentiator" offerings — River and Flow-Related Solutions, Digital Technologies, and Superfund Project Coordination & Liability Management — and three "Growth Accelerator" offerings — Recreation & Resort Development, Stormwatershed 360, and Data Centers — extend the platform into higher-value and emerging-demand verticals.

Revenue is generated through project-based professional services engagements delivered directly to enterprise clients across vertical markets including power delivery, water, government, industrial, renewable energy, transportation, power generation, technology, real estate, and oil & gas. Distribution is primarily direct enterprise sales supported by an online Plan Room bid portal, with operations in the USA and India. Growth is pursued through strategic acquisitions of regional engineering firms (e.g., Yu & Associates in June 2026 to expand Northeast capabilities) and active hiring in both geographies.

Name

Duffield Associates

Website

https://duffnet.com

Company type

Private

Founded year

1976

Operating status

Operating

Headcount range

101–250 employees

Short description

Duffield Associates is an integrated environmental science and engineering firm delivering multidisciplinary consulting across environmental remediation, civil/geotechnical/structural engineering, water systems, and digital technologies to government, utility, industrial, power, and renewable energy clients in the USA and India.

Ownership category

akta.pro rank

Headquarters

HQ city

Wilmington

HQ country

United States

HQ region

North America

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 consulting services including environmental assessment, remediation, health and safety, natural resources planning, and sustainability advisory services. Revenue generated through project-based professional services engagements with government, industrial, and commercial clients.
2. Engineering Consulting Services: Engineering services spanning architecture, electrical, mechanical, structural, geotechnical, hydrology, civil engineering, and water/wastewater systems. Delivered as professional services to infrastructure, power, transportation, and real estate markets.
3. Digital Technology Services: Digital technologies solutions including automation engineering, creating innovative solutions for businesses to succeed in a digital world.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

Duffield Associates is a civil engineering firm headquartered in Wilmington, Delaware, serving clients across Delaware, Pennsylvania, New Jersey, and Maryland. The firm delivers integrated environmental science and engineering services, spanning civil, geotechnical, structural, water and wastewater systems, environmental assessment, remediation, sustainability advisory, surveying, and related consulting disciplines. Engagements are delivered as professional, project-based services to government, industrial, utilities, real estate, transportation, and energy sector clients.

Product overview

Verdantas offers an integrated suite of environmental science and engineering services delivered through a platform-plus-modules architecture. The core offerings are Environmental Science Solutions and Engineering Solutions, supplemented by three Key Differentiators (River and Flow-Related Solutions, Digital Technologies, and Superfund Project Coordination & Liability Management) and three Growth Accelerators (Recreation & Resort Development, Stormwatershed 360, and Data Centers). The company integrates environmental science and engineering with advanced technology to address challenges across environment, water, and energy transition markets.

Differentiator

Problem solved

Functional benefit

Brands

• Stormwatershed 360: Stormwater management solution offering
• HyTN (Hydropower Testing Network)

Products and services

• Environmental Science Solutions Environmental science services including environmental assessment and remediation, CERCLA/RCRA and multiparty remediation, environmental health and safety, natural resources and environmental planning, and sustainability advisory for government, industrial, and commercial clients.
• Engineering Solutions Comprehensive engineering services including architecture, automation engineering, digital technologies, electrical engineering, geotechnical and geological engineering, hydrology/hydraulics/fluids, mechanical engineering, site and roadway civil engineering, structural engineering, surveying, and water and wastewater systems engineering.
• River and Flow-Related Solutions Solving flow-related challenges where infrastructure and environment intersect, addressing complex hydrological and hydraulic problems.
• Digital Technologies Innovative digital solutions that help businesses succeed in an increasingly digital world, creating competitive advantage through technology integration.
• Superfund Project Coordination and Liability Management Strategies to manage risks and liabilities for Superfund and complex remediation efforts, including CERCLA/RCRA compliance and multiparty remediation coordination.
• Stormwatershed 360 Stormwater and watershed management solutions delivered as a branded offering under the firm's environmental and water portfolio.
• Data Centers Engineering and environmental solutions for data center development and infrastructure, including siting, environmental compliance, and sustainability support.
• Recreation and Resort Development Engineering and environmental solutions supporting recreation and resort development projects.

Segments10 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Yu & AssociatescoreStrategic or Co-development Partner · 18 June 2026Verdantas expanded Northeast capabilities with the acquisition of Yu & Associates on June 18, 2026. This acquisition strengthens Verdantas' presence and service offerings in the Northeast region, adding environmental and engineering expertise to the platform.

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• AECOM: Global infrastructure consulting firm with deep environmental services, water, and civil engineering practices. Comparable to Duffield because both compete for environmental, water/wastewater, and site/civil engineering work for government, industrial, and utility clients.
• Tetra Tech: High-end environmental and water resources consulting and engineering firm with strong federal and remediation practices. Comparable on water systems engineering, CERCLA/RCRA remediation, and government/municipal client overlap.
• WSP Global: International professional services firm focused on transportation, environmental, and water engineering. Comparable via overlapping site/roadway civil engineering, environmental assessment, and water/wastewater practice areas serving Mid-Atlantic and U.S. government clients.
• Stantec: Engineering, architecture, and environmental services firm with strong water and community development practices. Comparable across water/wastewater systems, site civil engineering, and environmental assessment for municipalities and developers.
• Jacobs Solutions: Global technical professional services firm with major environmental, water, transportation, and federal practices. Comparable on Superfund/cleanup work, water infrastructure, and government environmental program delivery.
• Arcadis: Design and consultancy firm with major U.S. presence in water, environmental, and resilience engineering. Comparable via water/wastewater systems engineering, environmental remediation, and flood/flow-related advisory work.
• GHD: Global engineering and environmental consulting firm with strong U.S. water, environmental, and community development practices. Comparable across water/wastewater, site civil, and environmental assessment for municipal and industrial clients.

Direct peers

• Brown and Caldwell: Employee-owned environmental and water consulting firm focused on U.S. municipal and industrial water/wastewater. Closely comparable to Duffield on water and wastewater systems engineering, with similar mid-size consulting economics.
• Geosyntec Consultants: Specialty environmental and geotechnical engineering consultancy strong in CERCLA/RCRA remediation, site investigation, and water resources. Comparable on environmental assessment/remediation, geotechnical engineering, and complex multiparty cleanup work.
• Haley & Aldrich: Mid-size environmental and geotechnical engineering consultancy with significant Mid-Atlantic and U.S. footprint. Comparable via site/civil engineering, geotechnical, and environmental remediation services to industrial, institutional, and real estate clients.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights5 records

Customer concentration

• YouTubeyoutube.com/channel/UCYWsJfHTBJAkMYZ1jcyVABA
• Facebookfacebook.com/duffieldassoc
• LinkedInlinkedin.com/company/duffield-associates
• Instagraminstagram.com/we.are.verdantas

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about Duffield Associates