What Onterris does

Onterris is a global environmental solutions company headquartered in Little Rock, Arkansas, that provides integrated consulting, laboratory testing, treatment, remediation, and 24-hour emergency response services across air, water, and soil media. The company serves 6,100+ clients across nine vertical sectors — chemical, energy, government, infrastructure, manufacturing, mining and minerals, solid waste, technology and digital infrastructure, and transportation — through 100+ offices in the United States, Canada, and Australia, with a stated headcount of 3,500 employees.

The company's core technology stack combines environmental science and engineering with proprietary treatment systems, notably Nanosorb® (an advanced synthetic resin for PFAS removal with on-site regeneration capability) and Foam-X (a scalable PFAS treatment system for landfill leachate). A national network of DOD-certified, NELAP-accredited, ISO-17025:2017-certified environmental laboratories (operated under the Enthalpy Analytical brand) provides accredited testing and chemist-led data validation, including Superfund data validation processes. Real-time multi-media monitoring, fenceline monitoring programs, and leak detection services extend the technical surface into operations-grade environmental intelligence.

The business model is enterprise B2B professional services delivered via a field-based, relationship-driven sales motion with quote-based pricing for government, industrial, and commercial clients. Revenue streams span environmental consulting, accredited laboratory testing, treatment technology deployment, and emergency response. The company was founded in 2012 as Montrose Environmental Group, grew through acquisitions (including CTEH in 2020), and rebranded to Onterris on April 21, 2026, with the NYSE ticker changing from MEG to ONT effective May 4, 2026.

Name

Onterris

Legal name

Onterris, Inc.

Website

https://onterris.com

Company type

Public

Founded year

2012

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Onterris is a global environmental solutions company that provides consulting, accredited laboratory testing, proprietary treatment technologies, and 24-hour emergency response across air, water, and soil media to 6,100+ government, industrial, and commercial clients in the U.S., Canada, and Australia.

Ownership category

akta.pro rank

Headquarters

HQ city

Little Rock

HQ country

United States

HQ region

North America

Offices17 records

Markets served

GTM type

B2B

Offering type

Services

Revenue model

1. Environmental Consulting Services: Professional consulting services for contaminated land assessment, remediation, permitting, compliance, planning, and regulatory support across government, industrial, and commercial sectors.
2. Laboratory Testing and Analysis: Accredited environmental laboratory testing services for air, water, soil and other environmental media. NELAP and DOD-certified operations across multiple U.S. locations.
3. Emergency Response Services: 24-hour emergency response for environmental incidents including chemical releases, industrial accidents, and environmental contamination. Air monitoring, exposure assessment, toxicology analysis, and real-time data interpretation.
4. Treatment Technologies: Advanced treatment systems including PFAS treatment, water and wastewater treatment, and vapor treatment. Proprietary technologies like Nanosorb® for on-site regeneration.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

Onterris (formerly Montrose Environmental Group) is a global environmental solutions firm that provides integrated consulting, accredited laboratory testing, proprietary treatment technologies, and 24/7 emergency response services across air, water, soil, and waste media. The company serves government agencies, industrial operators, energy producers, and commercial enterprises through a network of more than 100 offices in the U.S., Canada, and Australia, anchored by a DOD-certified, NELAP-accredited laboratory network and proprietary treatment systems such as Nanosorb® and Foam-X for PFAS removal.

Product overview

Onterris is a global environmental solutions company offering integrated environmental consulting, testing, and treatment services. The portfolio includes the core Onterris platform unified from former brands (Montrose Environmental, ECT2, CTEH, Enthalpy Analytical, Epic Environmental, Environmental Standards, Spirit Environmental, Sensible EDP, Two Dot Consulting). Key solutions include Contaminated Land & Remediation, Permitting & Compliance, Emergency Response (Planning, Preparedness, Response & Recovery), Health/Safety/Chemistry, Testing & Analysis (via Enthalpy Analytical network of DOD-certified labs), Water Consulting/Treatment, Community Resiliency, Natural Resources, and Treatment Technologies (including ECT2's proprietary Nanosorb PFAS treatment systems). The company operates across 100+ offices in the U.S., Canada, and Australia serving 6,100+ clients.

Differentiator

Problem solved

Functional benefit

Brands

• Enthalpy Analytical: Accredited environmental laboratory testing and analytical services network.
• CTEH
• ECT2
• Two Dot Consulting
• Epic Environmental

Products and services

• Contaminated Land & Remediation Assessment, management, and remediation of contaminated sites including brownfields, industrial sites, and defense locations, delivered to government and industrial clients.
• Permitting & Compliance Environmental permitting services and regulatory compliance support across federal, state, and local jurisdictions for industrial and government clients.
• Planning, Preparedness, Response & Recovery 24-hour emergency response and disaster recovery services including spill response, incident command coordination, exposure assessment, air monitoring, and toxicology analysis for environmental incidents.
• Health, Safety & Chemistry Industrial hygiene, occupational safety, toxicology consulting, and health risk assessment services supporting industrial hygiene and environmental health programs.
• Testing & Analysis Environmental laboratory testing and field analysis services including stack testing, source emissions testing, leak detection, ambient air monitoring, and PFAS testing delivered through the company's national network of accredited laboratories.
• Water Consulting, Testing & Treatment Water and wastewater consulting, testing, and treatment solutions including PFAS treatment, vapor treatment, and drinking water services for utilities, industry, and communities.
• Community Resiliency Climate risk management, climate impact assessments, and climate-related risk consulting for organizations navigating physical and transition climate risks.
• Natural Resources Ecological assessments, wetland delineation, waterway management, and wildlife habitat monitoring services for infrastructure and development projects.
• Treatment Technologies Advanced treatment systems including PFAS treatment via proprietary Nanosorb® resin and Foam-X system, plus mobile, modular, and bespoke water and vapor remediation systems.

Quantifiable outcome

• 220+ solar plus 80 MW/160 MWh battery storage projects enabled
• +4 more outcomes

Named customers6 records

Segments7 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Three partnerships are on record, tiered core.

• Infinity Métis Corp.coreStrategic or Co-development PartnerOnterris Infinity is a joint venture partnership with Infinity Métis Corp. in the McMurray Métis community. Collaborative environmental services delivery with local Indigenous community partnership and capacity building.
• Aseniwuche Winewak NationcoreStrategic or Co-development PartnerFormal relationship agreement with Aseniwuche Winewak Nation to collaboratively deliver environmental services and build local capacity. Committed to supporting meaningful progress toward reconciliation while delivering strong project outcomes.
• U.S. Environmental Protection Agency (EPA)coreStrategic or Co-development PartnerWorks side-by-side with EPA and their contractors to compare environmental monitoring data collected in communities. EPA has consistently approved Onterris data processes and interpretations regarding human health.

Scale indicators7 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Tetra Tech: Leading global consulting and engineering firm specializing in water, environment, and sustainable infrastructure. Directly comparable to Onterris across environmental consulting, water treatment, and federal/regulatory services, with a similar enterprise client base.
• Arcadis: Global design, engineering, and consulting firm with a focused environmental and water practice. Directly comparable to Onterris across contaminated site remediation, water consulting, and climate resilience services for industrial and government clients.
• ERM (Environmental Resources Management): Largest pure-play global environmental, health, safety, and sustainability consultancy. Directly comparable to Onterris across EHS consulting, permitting, contaminated site management, and ESG advisory for enterprise and energy clients.
• GHD: Australian-headquartered global engineering and environmental consultancy with strong presence in Australia, North America, and water/environment. Closely comparable to Onterris's Epic Environmental Australia operations and broader contaminated land and water practices.
• SLR Consulting: Global environmental and advisory consultancy focused on contaminated land, water, and EHS. Comparable to Onterris across environmental consulting, site assessment, and remediation, with a similar enterprise and government client mix.
• Haley & Aldrich: U.S. environmental and geotechnical consulting firm serving energy, infrastructure, and industrial clients. Comparable to Onterris across contaminated site management, environmental due diligence, and remediation services with similar mid-to-large enterprise engagement models.

Broad incumbents

• AECOM: Global professional services firm with a sizable environment practice covering remediation, water, and regulatory compliance. Comparable as a broad incumbent serving similar government and industrial clients, though with a much larger portfolio of non-environmental services.
• Jacobs Solutions: Diversified professional services firm with a critical mission solutions and environmental practice addressing water, remediation, and PFAS challenges. Comparable as an incumbent serving government and industrial clients across overlapping environmental consulting and treatment lines.
• WSP Global: Global professional services consultancy with strong environment, earth, and water practices. Comparable as a broad incumbent offering environmental permitting, remediation, and ESG advisory with a similar multi-sector enterprise client base.
• Stantec: North American engineering and consulting firm with a substantial environmental services practice covering water, remediation, and permitting. Comparable to Onterris across environmental and water consulting for industrial, mining, and government clients.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/onterris
• YouTubeyoutube.com/@onterris
• LinkedInlinkedin.com/company/onterris

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries9 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 Onterris