Horsley Witten Group, Inc.

What Horsley Witten Group, Inc. does

Horsley Witten Group, Inc. (HW) is a privately-held, mission-driven engineering, design, and environmental consulting firm incorporated in 1987 and headquartered in Sandwich, Massachusetts. The firm employs 75+ interdisciplinary professionals — including civil engineers, hydrogeologists, scientists, planners, and landscape architects — across five offices in Massachusetts (Sandwich HQ, Boston), Rhode Island (Providence), New Hampshire (Exeter), and the U.S. Virgin Islands (St. Croix). HW delivers nature-based, green stormwater infrastructure (GSI) solutions combining civil engineering, hydrology, soil science, biology, and landscape architecture to address stormwater management, ecological restoration, climate resilience, and comprehensive municipal planning challenges.

HW generates revenue through project-based professional services engagements under a hybrid segmentation model spanning federal, state, municipal, nonprofit, and private clients. Federal revenue flows through GSA Multiple Award Schedule (Contract 47QRAA22D005P) and OASIS+SB (Contract 47QRCA25DSB78) vehicles, with anchor clients including EPA (five-year, $10 million emergency preparedness contract), NOAA ($2 million Coral Reef Conservation Program contract), FHWA, DOJ, and NIST. Service offerings span six core disciplines — Engineering, Planning, Design, Science, Training, and Outreach — plus specialized practices in GSI, Climate Resilience Planning, Emergency Response Planning, GIS/Geospatial Services, and Tropical Island Services. Pricing is quote-driven and project-based with no publicly disclosed tiers; federal contracts use pre-established GSA/OASIS pricing frameworks.

The firm's go-to-market is enterprise field sales through direct client engagement, supported by thought-leadership content marketing (HW Currents podcast, op-eds in regional press, LinkedIn/social channels) and federal past-performance credentials. Geographic reach spans New England as the core market, with active project work across the U.S. Caribbean (USVI, Puerto Rico, BVI, Bahamas), Pacific (Hawaii, CNMI, Guam, American Samoa, Palau), and Southeast Florida. HW holds no disclosed external investors, subsidiaries, or parent entities and is led by President Nathan Kelly and a principal cohort with 20-35+ years of individual tenure.

Name

Horsley Witten Group, Inc.

Legal name

Horsley Witten Group, Inc.

Website

https://horsleywitten.com

Company type

Private

Founded year

1987

Operating status

Operating

Headcount range

11–50 employees

Short description

Horsley Witten Group is a privately-held environmental consulting firm providing engineering, planning, design, and science services to federal, state, municipal, and nonprofit clients across New England, the Caribbean, and Pacific islands, with deep specialization in green stormwater infrastructure and climate resilience.

Ownership category

akta.pro rank

Product category

Environmental Engineering Consulting

NAICS

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

SIC

Services-Management Consulting Services (8742), Services-Commercial Physical & Biological Research (8731)

akta.pro primary industry

Water, Wastewater & Hydraulics Engineering Consulting (BPAHAIAD)

akta.pro secondary industry

Water, Wastewater & Stormwater Compliance (BPAHAJAJ)

Keywords

• Environmental engineering services
• Stormwater management consulting
• Climate resilience planning
• Green infrastructure design
• Water resources engineering

Headquarters

HQ city

Sandwich

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Environmental Consulting Services: Professional services revenue generated through engineering, design, environmental consulting, and planning engagements for government and private sector clients. Projects include stormwater management, water quality planning, ecological restoration, and climate resilience services.
2. Federal Government Contracts: Revenue through federal contract vehicles including GSA Multiple Award Schedule (MAS) and OASIS+SB government-wide contract programs. Services provided to federal agencies under these vehicles include environmental consulting, engineering, and planning.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels8 records

Core offering

Horsley Witten Group is an independent environmental consulting firm providing engineering, planning, design, science, training, outreach, and tropical-environment services. The firm's practice centers on green stormwater infrastructure, climate resilience, emergency response, and GIS/geospatial analysis for federal, state, local, and private-sector clients. With 75+ staff across offices in Massachusetts, Rhode Island, New Hampshire, and the U.S. Virgin Islands, HW delivers multidisciplinary technical solutions grounded in nature-based approaches.

Product overview

Horsley Witten Group is a mission-driven environmental consulting firm offering an integrated suite of services including Engineering, Planning, Design, Science, Training, and Outreach. The company provides specialized services in Green Stormwater Infrastructure (GSI), Climate Resilience Planning, Emergency Response Planning, GIS & Geospatial Services, and Tropical Services for Pacific and Caribbean islands. Their approach combines civil engineering, urban design, climate resiliency, and landscape architecture to deliver nature-based solutions for environmental and climate-related challenges. The firm operates through multiple offices across New England and serves federal, state, and local government clients as well as private sector clients.

Differentiator

Problem solved

Functional benefit

Products and services

• Engineering Services Environmental and water resources engineering services delivered to federal, state, local, and private-sector clients by Horsley Witten Group.

Quantifiable outcome

• Over 80% client return rate
• +2 more outcomes

Named customers9 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• BETA Group, Inc.coreStrategic or Co-development PartnerCollaborated on the Fuller Brook Park Preservation Project in Wellesley, MA. HW and BETA Group received ACEC Engineering Excellence Bronze Award for the project involving stream restoration and wetland enhancement.
• NOAA Coral Reef Conservation ProgramcoreStrategic or Co-development PartnerHW manages a 5-year NOAA Coral Reef Conservation Program Contract valued at $2 million to provide technical support services for watershed and stormwater work in US Virgin Islands, Puerto Rico, Florida, and Pacific jurisdictions.
• X-Cel Education Conservation CorpscoreStrategic or Co-development PartnerPartnership prepares Boston youth for careers in water management and conservation fields. HW and partners facilitate conservation projects providing hands-on training in green stormwater infrastructure maintenance, environmental field sampling, and wastewater operations.
• Natural Resources Conservation Service (NRCS)minorImplementation/ SI/ Consulting PartnerPartner on Crosby Landing Culvert Replacement project in Brewster, MA, working on climate-resilient road raising and green stormwater infrastructure improvements.
• Cape Cod Conservation District (CCCD)minorImplementation/ SI/ Consulting PartnerCollaborated on Crosby Landing project addressing salt marsh degradation and stormwater management in Brewster, MA.
• Association to Preserve Cape Cod (APCC)minorImplementation/ SI/ Consulting PartnerPartner in Crosby Landing project and Three Bays Watershed work to reduce stormwater pollution in Barnstable, MA.
• Pare Corp. and StantecminorImplementation/ SI/ Consulting PartnerCollaborated on Macomber Stadium GSI project with Narragansettett Bay Commission for combined sewer overflow reduction.
• VI Department of Planning and Natural ResourcescoreImplementation/ SI/ Consulting PartnerLong-term partnership for watershed management and planning in US Virgin Islands, including Smith Bay watershed work and mangrove habitat restoration.

Scale indicators6 records

Recent moves10 records

Expansion highlights6 records

Direct peers

• BETA Group, Inc. New England-based engineering and environmental consulting firm with overlapping civil, stormwater, and water resources practices. HW has partnered directly with BETA on projects such as the Fuller Brook Park preservation, demonstrating close product and customer alignment.
• Tighe & Bond: Engineering and environmental consulting firm headquartered in Massachusetts serving municipal and private clients with water, wastewater, stormwater, and planning services — directly overlapping with HW's core service lines in the same geography.
• Woodard & Curran: Maine-headquartered environmental engineering and consulting firm providing water, wastewater, and infrastructure services to municipalities. Comparable mid-sized firm competing in similar Northeast municipal RFPs.
• Weston & Sampson: New England-based environmental engineering firm offering water, wastewater, and stormwater consulting. Competes with HW on similar municipal and federal GSI, watershed, and resilience engagements.
• Fuss & O'Neill: Northeast-based engineering, planning, and environmental science firm providing civil/site design, water resources, and ecological restoration services — closely overlapping HW's integrated engineering and environmental practice.

Broad incumbents

• Tetra Tech: Global environmental and engineering consulting leader with substantial water resources, climate resilience, and nature-based solutions practices. A broad incumbent that frequently competes with HW on federal and large municipal pursuits.
• Stantec: Major global engineering, environmental, and design consultancy with strong water and community development practices. Collaborates with HW on projects such as Macomber Stadium and competes for similar federal and municipal work.
• AECOM: Global infrastructure consulting firm with extensive environmental, water, and climate adaptation services. A broad incumbent operating across the same federal contract vehicle ecosystem where HW competes.
• CDM Smith: Major water, environment, and infrastructure consulting firm with deep federal agency relationships. Competes with HW on EPA, NOAA, and municipal water/wastewater engagements.

Emerging players

• Biohabitats: Specialist ecological restoration and green infrastructure firm with national reach. Competes with HW's ecological restoration, GSI, and watershed practices, particularly on nature-based stormwater and stream restoration projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubevimeo.com/horsleywitten
• Facebookfacebook.com/horsleywittengroup
• LinkedInlinkedin.com/company/horsley-witten-group-inc
• Instagraminstagram.com/horsleywittengroup

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

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 Horsley Witten Group, Inc.