NDT

What NDT does

NDT Corporation, founded in 1994 in Sterling, Massachusetts, is a B2B professional services firm specializing in non-destructive testing (NDT) and geophysical evaluation of concrete and subsurface infrastructure. The company serves infrastructure owners, engineering consultants, and contractors — including state DOTs (MBTA, Rhode Island DOT, NYDOT, Florida DOT), major engineering firms (WSP, SGH, AECOM, Mueser Rutledge), and contractors (Skanska, Kiewit) — providing condition assessment, repair design, rehabilitation planning, and asset management data across bridges, buildings, marine structures, parking structures, pipes and tanks, power/dam infrastructure, and agriculture.

The company's service portfolio is built around four core offerings: (1) general Non-Destructive Testing (including proprietary Impact Echo/Pulse Velocity systems, Ground Penetrating Radar, acoustic tomography, ultrasonic thickness, infrared thermography, corrosion potential mapping, and the Automated Concrete Tie Tester for railroad crossties); (2) Prestressed and Post-Tension Inspection (grout void identification, borescope inspection); (3) Geophysics, Subsurface and Pile Testing (cross-hole seismic, parallel seismic, MASW, low-frequency GPR); and (4) Core Collection and Material Testing (compressive strength, chloride, carbonation, petrography). Differentiated technology includes custom-built IE/PV systems developed in-house, an FRA-co-developed automated railroad crosstie inspection tool, and gold-standard cross-hole seismic testing capabilities.

Revenue is generated on a project-based professional services model, with pricing tied to project scope, structure type, and required testing methods, and sales conducted via enterprise field engagement with engineering consultants and asset owners. The company has historically been founder-led (Paul Fisk and Richard Holt, ex-Weston Geophysical, 1994), transitioned leadership to Bill Horne (formerly of CHA) in 2017 with Paul Fisk's retirement in 2021, and in August 2025 received institutional backing from Novacap and La Caisse to acquire Entegra from Amberjack. NDT operates across the United States, Canada, the United Kingdom, and the Middle East, with a principal-heavy technical staff including R&D, operations, and senior technician roles and ongoing investment in proprietary instrumentation.

Name

NDT

Legal name

NDT Corporation

Website

https://ndtcorporation.com

Company type

Private

Founded year

1994

Operating status

Operating

Headcount range

11–50 employees

Short description

NDT Corporation, founded in 1994 and based in Sterling, Massachusetts, provides non-destructive and geophysical testing services for concrete and subsurface infrastructure, serving state DOTs, engineering consultants, and contractors across bridges, marine, power, and water sectors.

Ownership category

akta.pro rank

Product category

Infrastructure Testing Services

NAICS

Testing Laboratories and Services (541380), Geophysical Surveying and Mapping Services (541360), Engineering Services (54133)

SIC

Services-Testing Laboratories (8734)

akta.pro primary industry

Non-Destructive Testing (NDT) & Inspection Services (IMAIACAI)

akta.pro secondary industries

Non-Destructive Testing (NDT) & Advanced Inspection (Phased Array, TOFD, Guided Wave) (EUAEAKAF), Structural & Civil Inspection (Steel, Concrete, Foundations) (EUAEAHAI), Marine Surveys, Testing & NDT (Thickness Gauging, UT/MPI, Pressure Testing, Commissioning) (TLAHAMAK)

Keywords

• Non-destructive testing services
• Concrete condition assessment
• Geophysical infrastructure testing
• Post-tension inspection
• Bridge deck evaluation

Headquarters

HQ city

Sterling

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Non-Destructive Testing Services: Professional services revenue generated from providing non-destructive and geophysical testing services to evaluate the condition, integrity, and performance of concrete and subsurface infrastructure. Services include testing delivered to engineers and owners for condition assessment, repair design, rehabilitation strategies, and asset management. Revenue is project-based, typically obtained through engineering consultant retainers or direct owner engagement.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

NDT Corporation provides non-destructive and geophysical testing services for concrete and subsurface infrastructure. The company delivers quantitative condition assessment data using methods such as Impact Echo/Pulse Velocity, Ground Penetrating Radar, acoustic tomography, corrosion potential mapping, seismic geophysics, and borescope inspection. Services support engineers, asset owners, government transportation agencies, and contractors in repair design, rehabilitation planning, and asset management decisions for bridges, dams, wharves, parking structures, and foundations.

Product overview

NDT Corporation is a non-destructive testing services company founded in 1994 that provides testing and evaluation services for concrete and steel infrastructure. The company operates as a single unified service offering rather than a software platform, organized around four main service areas: Non-Destructive Testing Services (which includes Ground Penetrating Radar, Impact Echo/Pulse Velocity, Acoustic Tomography, Corrosion Potential Mapping, Ultrasonic Thickness Testing, Infrared Thermography, and Railroad Tie Testing), Prestressed and Post-Tension Inspection (including Borescope Inspection), Geophysics/Subsurface & Pile Testing (including MASW and various seismic methods), and Core Collection & Material Testing (including Petrography). The company's proprietary Impact Echo/Pulse Velocity system is central to their diagnostic toolkit, enabling simultaneous data collection for assessing concrete conditions and locating grout voids in post-tension ducts. Services are delivered across multiple market sectors including bridges, buildings, parking structures, marine, power/dam, pipes/tanks, and agriculture.

Differentiator

Problem solved

Functional benefit

Products and services

• Non-Destructive Testing Services Comprehensive NDT services including acoustic tomography, corrosion potential and rate testing, ground penetrating radar, impact echo/pulse velocity testing, infrared thermography, railroad tie testing, and ultrasonic thickness testing for evaluating concrete and steel infrastructure conditions. Delivered to engineers, asset owners, government DOTs, and contractors.
• Prestressed and Post-Tension Inspection Inspection services for prestressed and post-tension concrete structures including grout void identification, unbonded PT evaluation, borescope inspection, and acoustic inspection methods to assess structural integrity and durability of tendons and ducts.
• Geophysics, Subsurface and Pile Testing Geophysical testing services including cross-hole seismic measurements, electrical soil resistivity, parallel seismic data, pile length testing, shallow seismic refraction, vertical seismic profiling, MASW, low-frequency GPR, and magnetic gradiometer for subsurface characterization and foundation evaluation.
• Core Collection and Material Testing Material testing services including concrete core extraction, carbonation depth testing, chloride concentration analysis, compressive strength testing, and petrographic analysis for comprehensive material condition assessment of concrete structures.

Quantifiable outcome

• Over 92,000 linear feet of IE/PV measurements collected on single project (Jamestown-Verrazzano Bridge)
• +2 more outcomes

Named customers14 records

Segments7 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

Two partnerships are on record, tiered flagship.

• Federal Railroad AdministrationflagshipStrategic or Co-development PartnerNDT Corporation partnered with the Federal Railroad Administration to develop an automated railroad crosstie inspection tool. This specialized non-destructive method enables rapid assessment of internal concrete crosstie conditions with real-time ratings, ensuring safety along critical rail corridors.
• Departments of TransportationflagshipStrategic or Co-development PartnerNDT Corporation collaborated with Departments of Transportation to develop a bridge deck testing system for efficient collection of IE/PV data supporting concrete condition assessments. This system has been routinely deployed on bridge decks and slabs.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Olson Engineering: Olson Engineering is a direct peer specializing in non-destructive testing of concrete and geophysical methods for infrastructure evaluation, including impact-echo, GPR, and seismic testing — directly overlapping NDT Corporation's core service offering and customer base.
• CTLGroup: CTLGroup provides materials and structural consulting including concrete condition assessment, petrography, and durability testing — overlapping with NDT's core collection, material testing, and concrete diagnostic service lines.
• SGH (Simpson Gumpertz & Heger): SGH is both an NDT customer (engineering consultant) and a structural engineering firm that performs condition assessments on concrete infrastructure — operating as a structural peer with overlapping inspection expertise.

Broad incumbents

• Mistras Group: Mistras Group is a broad incumbent in NDT/inspection services across energy, aerospace, and infrastructure, offering ultrasonic, radiographic, and advanced methods at significantly greater scale than NDT Corporation.
• Wiss, Janney, Elstner Associates (WJE): WJE is a large engineering and architecture firm that performs structural investigations and condition assessments of concrete and steel infrastructure, frequently commissioning or conducting NDT work that NDT Corporation supports.
• Bureau Veritas: Bureau Veritas is a global TIC (testing, inspection, certification) giant with infrastructure assessment and NDT capabilities across multiple verticals, providing a much broader but less specialized alternative.
• Terracon Consultants: Terracon is a large US geotechnical, environmental, and construction materials testing firm that performs NDT and condition assessment for infrastructure owners, competing indirectly for DOT and bridge inspection work.
• Braun Intertec: Braun Intertec is a US engineering firm providing geotechnical, environmental, and NDT services to transportation, infrastructure, and energy clients — frequently retained alongside or instead of smaller specialists like NDT Corporation.
• Pure Technologies (Xylem): Pure Technologies, part of Xylem, specializes in pipeline and structural condition assessment using acoustic, electromagnetic, and other NDT methods — overlapping with NDT's pipes/tanks and subsurface inspection capabilities.

Regional players

• Building & Earth Sciences: Building & Earth Sciences is a US geotechnical and construction materials testing firm offering NDT-adjacent inspection services to infrastructure and commercial clients, primarily in the southeastern US.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 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 NDT