Montrose

What Montrose does

Onterris (formerly Montrose Environmental Group) is a publicly traded, multi-national environmental services firm headquartered in Little Rock, Arkansas, operating across the United States, Canada, and Australia under a unified brand adopted in May 2026 (NYSE: ONT, formerly MEG). The company delivers integrated environmental consulting, analytical laboratory testing, emissions and air quality monitoring, contaminated land remediation, and environmental emergency response services to federal/state/local government agencies, oil and gas operators, and industrial clients across chemicals, manufacturing, mining, infrastructure, solid waste, transportation, and technology/digital infrastructure sectors. Its core operating assets include NELAP-accredited laboratories (Vista Analytical, Enthalpy Analytical, ECI, Origins), the CTEH emergency response practice, and consulting brands such as Matrix Solutions, Two Dot, Huco, and Epic Environmental. The company has executed a sustained acquisition-led growth strategy since 2021, completing 20+ transactions that broadened its laboratory capacity, geographic reach, and service breadth.

Technically, Onterris operates a stack of field services, laboratory instrumentation, and proprietary measurement hardware and software. The patent-pending VeriPlume Capture System™ uses a lightweight carbon-fiber telescoping mast to measure methane from high-volume vents up to 60 feet above ground, enabling ground-level operation and EPA OOOO-b compliance for oil and gas operators. The company holds 31 patents and additional trademarked technologies targeting PFAS removal and industrial VOC abatement. The LDAR (Leak Detection and Repair) program uses optical gas imaging across 2,160 sites, detecting 22,195 leaks and capturing 201,487 tonnes of CO2e in 2025. Strategic partnerships with Intertek and GHGSat integrate satellite-based emissions monitoring, and the 2021 SensibleIoT acquisition brought IoT data analytics into the platform.

Onterris generates revenue almost entirely through professional services engagements priced on a quote/project basis, organized around four revenue streams: Environmental Consulting and Advisory; Laboratory Testing and Analysis; Emissions and Air Quality Services; and Environmental Emergency Response (the CTEH division delivered $29.0M of this in 2025). Full-year 2025 revenue was $830.5 million, up 19.3% year-over-year, with $81.8M organic growth, $29.0M from emergency response, and $25.5M from 2024 acquisitions. Adjusted EBITDA was $116.2M (+21.3%), operating cash flow $107.5M, and free cash flow $87.0M. The company exited 2025 with a 2.5x leverage ratio after fully redeeming $122.2M of Series A-2 Preferred Stock and guided 2026 revenue to $840-$900M. Distribution is direct enterprise sales to government and industrial clients, supported by thought-leadership content marketing through the Onterris Outlook Report and topic hubs covering methane, PFAS, and remediation.

Name

Montrose

Legal name

Onterris, Inc.

Website

https://montrose-env.com

Company type

Public

Founded year

2012

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Onterris (formerly Montrose Environmental Group) is a publicly traded environmental services firm delivering consulting, laboratory testing, emissions monitoring, remediation, and emergency response to government agencies, oil and gas operators, and industrial clients across the U.S., Canada, and Australia.

Ownership category

akta.pro rank

Product category

Environmental Services

NAICS

Environmental Consulting Services (541620), Environmental Consulting Services (54162), Testing Laboratories and Services (54138)

SIC

Services-Testing Laboratories (8734), Services-Commercial Physical & Biological Research (8731), Oil & Gas Field Services, Nec (1389)

akta.pro primary industry

Leak Detection, Emissions & LDAR Testing (OGI, methane, fugitive emissions) (EUAEAHAL)

akta.pro secondary industries

Chemical Management & Toxic Substances Compliance (TSCA, REACH, GHS/SDS, PFAS Programs) (EUAHABAE), Compliance Obligations Management (Permits-to-Controls Mapping) (EUAHAIAK), Environmental Aspects/Impacts Register & Legal Register Development (EUAHAIAD)

Keywords

• Environmental consulting services
• Environmental testing analysis
• Contaminated land remediation
• Emissions monitoring testing
• PFAS VOC laboratory analysis

Headquarters

HQ city

Little Rock

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Environmental Consulting and Advisory Services: Professional consulting services for environmental compliance, permitting, EHS management, and ESG systems. Services delivered through Advisory and Specialty Services division.
2. Laboratory Testing and Analysis: Analytical laboratory services for water, soil, air contamination testing including PFAS, VOCs analysis. Services integrated into Measurement and Analysis Segment.
3. Emissions and Air Quality Services: Stack testing, source emissions testing, and emissions monitoring services for industrial facilities including oil and gas operators.
4. Environmental Emergency Response: CTEH division provides environmental emergency response services including planning, preparedness, response and recovery. Generated $29.0 million in environmental emergency response revenue in 2025.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Montrose Environmental Group (now Onterris) is a global environmental solutions company that delivers integrated environmental consulting, measurement, and treatment services. The company provides laboratory testing and analysis (including PFAS, VOCs, water, soil, and air contamination), permitting and compliance support, contaminated land remediation, emissions testing and leak detection, water consulting and treatment, and environmental emergency response through its CTEH division. Services are delivered to government agencies, oil and gas operators, and industrial clients across the U.S., Canada, and Australia.

Product overview

Onterris (formerly Montrose Environmental Group) is a global environmental solutions company offering integrated environmental consulting, testing, and treatment services through a platform of solution services and acquired subsidiary brands. The portfolio includes core service lines spanning contaminated land remediation, permitting and compliance, emergency response (CTEH), testing and analysis (Enthalpy Analytical, Vista Analytical Laboratory, Environmental Chemistry Inc.), water consulting and treatment, and treatment technologies. The company holds 31 patents including the VeriPlume Capture System™ for methane measurement and has trademarked technologies for PFAS removal and industrial VOC abatement. Brands unified under Onterris include ECT2, CTEH, Enthalpy Analytical, Epic Environmental (Australia), and multiple acquired consulting and laboratory firms. Services are delivered across sectors including chemical, energy, government, infrastructure, manufacturing, mining, solid waste, technology, and transportation.

Differentiator

Problem solved

Functional benefit

Products and services

• Contaminated Land & Remediation Environmental remediation services for contaminated land, addressing soil and groundwater pollution to restore sites for productive use; sold to government, energy, and industrial clients.
• Permitting & Compliance Regulatory permitting services and environmental compliance support to help clients meet EPA and other regulatory requirements.
• Planning, Preparedness, Response & Recovery Environmental emergency response services for environmental incidents including planning, preparedness, response, and disaster recovery, delivered through the CTEH division.
• Health, Safety & Chemistry Environmental health and safety consulting services and chemistry analysis for industrial clients, including EHS and ESG systems advisory.
• Testing & Analysis Comprehensive environmental testing services including stack testing, source emissions testing, and leak detection for industrial facilities, with PFAS, VOC, water, soil, and air contaminant analysis.
• Water Consulting, Testing & Treatment Water resource management, environmental testing, and treatment solutions for water contamination issues including PFAS and emerging contaminants.
• Community Resiliency Services helping communities build environmental resilience and adapt to environmental challenges, including Brownfields grant assistance.
• Natural Resources Natural resource management and environmental consulting services for the mining and minerals sector.
• Treatment Technologies Advanced environmental treatment technologies for addressing various contaminants including PFAS and industrial VOC abatement, backed by 31 patents.
• VeriPlume Capture System™ Patent-pending methane measurement technology product for high-volume vent emissions monitoring; deployed for oil and gas operator compliance with EPA OOOO-b regulations.

Quantifiable outcome

• Reduced 201,487 tonnes of CO2 equivalent emissions through LDAR program in 2025
• +3 more outcomes

Named customers3 records

Segments9 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Three partnerships are on record, tiered core.

• IntertekcoreTechnology or Integration · 9 December 2025Strategic partnership with Intertek to strengthen satellite-based monitoring capabilities and regulatory compliance services for clients across North America.
• GHGSatcoreTechnology or Integration · 9 December 2025Strategic partnership with GHGSat providing satellite-based monitoring capabilities to enhance emissions detection and regulatory compliance for clients.
• U.S. Department of Energy Savannah River SitecoreOthers · 30 October 2025Three-year contract renewal for laboratory testing services supporting environmental cleanup efforts at the Savannah River Site, a Department of Energy facility involved in nuclear materials production and environmental remediation.

Scale indicators13 records

Recent moves9 records

Expansion highlights6 records

Direct peers

• Tetra Tech: Leading pure-play environmental and water consulting firm (NASDAQ: TTEK) with similar end markets (government, energy, infrastructure) and overlapping services in remediation, compliance, and water resources. Closest large-cap comparable to Onterris.
• GHD: Australia-headquartered global engineering, environmental, and advisory firm with comparable environmental services across Australasia and North America. Direct competitor in environmental consulting and testing.
• Clean Harbors: Environmental and industrial services company (NYSE: CLH) providing hazardous waste management, emergency response (similar to CTEH), and field services to oil and gas, chemical, and government clients — directly comparable service mix and customer base.
• ERM (Environmental Resources Management): Global environmental, health, safety, and sustainability consultancy serving oil and gas, chemical, and mining clients with advisory and technical services. Closest private peer in environmental consulting scale and customer overlap.

Broad incumbents

• Stantec: Canadian engineering and environmental consulting firm (TSX: STN) with strong North American government and energy environmental practices. Comparable in regulatory consulting and water services.
• AECOM: Global infrastructure consulting firm (NYSE: ACM) with a large Environment business serving government and energy clients on remediation, permitting, and compliance. Overlaps with Onterris but as part of a much broader portfolio.
• Bureau Veritas: Global testing, inspection, and certification firm (Euronext: BVI) with overlapping lab-based environmental testing, stack testing, and compliance services for industrial clients. Larger scale, broader portfolio.
• WSP Global: Global professional services firm (TSX: WSP) with a major Environment business covering remediation, permitting, and climate services. Comparable services, primarily competing in Canada and North America where Onterris operates.
• Jacobs Solutions: Engineering and professional services firm (NYSE: J) with environmental and water practices serving government, energy, and infrastructure clients. Comparable in adjacent categories though larger and more diversified.

Others

• Intertek: Global testing, inspection, and certification firm (LSE: ITRK) and current Onterris partner. Comparable in lab and field testing services; also a strategic alliance partner rather than pure competitor in North American oil and gas monitoring.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/montrose_env
• YouTubeyoutube.com/@onterris
• LinkedInlinkedin.com/company/montrose-environmental-group-inc-

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Subsidiaries15 records

Funding overview

Funding rounds4 records

Investors2 records

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

M&A22 records

Investments1 record

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

Frequently asked questions about Montrose