What Horizon does

Onterris, Inc. (formerly Montrose Environmental Group; tracked as "Horizon" in input data with a likely firmographic mis-attribution) is a global environmental solutions company operating across the United States, Canada, and Australia. The company delivers an integrated portfolio of nine solution areas: contaminated land and remediation; permitting and compliance; planning, preparedness, response and recovery; health, safety and chemistry; testing and analysis (including EPA-compliant stack testing and fugitive emissions leak detection); water consulting, testing and treatment; community resiliency; natural resources; and treatment technologies. Underpinning these services is a "systems thinking" methodology that the company describes as uniting science, data, and practical field expertise, delivered through a "Client Login" portal and direct enterprise engagement.

Onterris serves nine target verticals: chemical, energy, government, infrastructure, manufacturing, mining and minerals, solid waste, technology and digital infrastructure, and transportation. The company monetizes via quote-based, multi-year professional services contracts — covering consulting engagements, laboratory analysis, stack and emissions testing, and remediation projects — with pricing not publicly disclosed. Distribution is direct enterprise field sales, supported by thought-leadership content including the Onterris Outlook Report and topical briefs on regulatory developments such as 2026 Federal Methane Rules, PFAS, and emerging contaminants. The company maintains an investor relations site at ir.onterris.com, an active Workday careers portal, and social channels on LinkedIn, X/Twitter, and YouTube.

The business was carried forward through a 2025 company-wide rebrand of Montrose Environmental Group to Onterris, presented as a unification of its global environmental solutions identity under a single brand. The legal entity remains Onterris, Inc., a U.S. corporation. Notable data gaps in the input include: no disclosed revenue figures, no disclosed funding rounds, no named customer logos, no specific headcount figure (the firmographic block's 11–50 employee range is inconsistent with the global operational scope described elsewhere), and no disclosed leadership team beyond a single founding principal.

Name

Horizon

Legal name

Onterris, Inc.

Website

https://horizonh2o.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

11–50 employees

Short description

Onterris, Inc. (formerly Montrose Environmental Group) is a global environmental solutions company providing integrated consulting, testing, remediation, and compliance services to enterprise and government clients across nine industry verticals in the U.S., Canada, and Australia.

Ownership category

akta.pro rank

Product category

Environmental Consulting Services

NAICS

Environmental Consulting Services (541620)

SIC

Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Environmental Compliance & Permitting (BPAHAJAA)

akta.pro secondary industries

Air Quality & Emissions Management (BPAHAJAI), Water, Wastewater & Stormwater Compliance (BPAHAJAJ), Sustainability, ESG & Climate Risk Advisory (BPAHAJAH), Sustainability & ESG Consulting (BPAHACAK)

Keywords

• Environmental consulting services
• Air quality testing
• Site remediation solutions
• Regulatory compliance services
• Emissions testing services

Headquarters

HQ city

Oakland

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, Marketing or Sales, Infrastructure

Revenue model

1. Environmental Consulting Services: Professional consulting services for environmental compliance, permitting, planning, preparedness, response and recovery, health, safety and chemistry, and natural resources
2. Testing and Analysis Services: Laboratory analysis, stack testing, source emissions testing, leak detection and fugitive emissions management, water testing
3. Remediation Services: Contaminated land remediation and treatment technologies

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Horizon (operating data refers to Onterris, Inc., formerly Montrose Environmental Group) is a global environmental solutions company delivering integrated services across air quality, emissions testing, environmental consulting, analytical services, contaminated land remediation, and regulatory compliance. Its portfolio spans Contaminated Land & Remediation, Permitting & Compliance, Planning/Preparedness/Response & Recovery, Health/Safety & Chemistry, Testing & Analysis (including stack testing and leak detection), Water Consulting/Testing & Treatment, Community Resiliency, Natural Resources, and Treatment Technologies. Services are delivered to enterprise and government clients across chemical, energy, government, infrastructure, manufacturing, mining, solid waste, technology and digital infrastructure, and transportation sectors in the U.S., Canada, and Australia.

Product overview

Onterris is a global environmental solutions company offering an integrated platform of environmental services. The company operates across nine core solution areas: Contaminated Land & Remediation, Permitting & Compliance, Planning/Preparedness/Response & Recovery, Health/Safety & Chemistry, Testing & Analysis (including Stack Testing and Leak Detection services), Water Consulting/Testing & Treatment, Community Resiliency, Natural Resources, and Treatment Technologies. These solutions serve diverse sectors including Chemical, Energy, Government, Infrastructure, Manufacturing, Mining & Minerals, Solid Waste, Technology & Digital Infrastructure, and Transportation. The company was formed through the rebrand of Montrose Environmental Group and carries forward its legacy of air quality solutions, emissions testing, environmental consulting and analytical services.

Differentiator

Problem solved

Functional benefit

Products and services

• Contaminated Land & Remediation Environmental remediation services for contaminated land sites, addressing soil and groundwater contamination through systematic assessment and cleanup approaches for industrial, mining, and brownfield clients.
• Permitting & Compliance Regulatory permitting services and ongoing compliance support to help organizations meet environmental regulatory requirements across jurisdictions including the U.S., Canada, and Australia.
• Planning, Preparedness, Response & Recovery Emergency response planning and recovery services, including Emergency Response capabilities for decisive environmental action during incidents affecting clients' operations or surrounding communities.
• Health, Safety & Chemistry Health, safety, and chemical services to help organizations manage occupational health risks and chemical safety compliance across industrial operations.
• Testing & Analysis Comprehensive testing and analysis services including EPA-compliant Stack Testing (source emissions testing for industrial facilities) and Leak Detection (fugitive emissions management) for complex industrial facilities, with laboratory analysis delivered on a quote basis.
• Water Consulting, Testing & Treatment Water-related consulting, testing, and treatment services addressing water quality, treatment technologies, and water resource management for industrial, municipal, and mining clients.
• Community Resiliency Services focused on building community resilience against environmental challenges and climate-related impacts for government, infrastructure, and industrial clients.
• Natural Resources Natural resource management and consulting services to support sustainable utilization and protection of natural assets across client operations.
• Treatment Technologies Advanced treatment technology solutions for addressing environmental contamination and waste challenges across contaminated land, water, and waste streams.

Segments9 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Scale indicators1 record

Recent moves6 records

Expansion highlights5 records

Direct peers

• GHD: Employee-owned global engineering, architecture, and environmental consulting firm. Comparable to Onterris in environmental compliance, water, contaminated land, and multi-sector industrial client base across North America and Australia.
• Ramboll: Global engineering, architecture, and consultancy firm with a strong environmental and health practice. Closely aligned with Onterris' environmental solutions, climate advisory, and sustainability positioning across Europe, North America, and APAC.
• SLR Consulting: Global environmental and sustainability consultancy offering advisory, compliance, remediation, and air quality services. Closely comparable to Onterris in mid-sized environmental consulting profile, multi-sector coverage, and multi-jurisdictional operations.
• Arcadis: Global design and consultancy firm with a substantial environmental and water practice. Comparable to Onterris through shared focus on remediation, water treatment, climate resilience, and multi-jurisdictional regulatory advisory.
• Tetra Tech: Leading global consulting and engineering firm specializing in water, environment, and sustainable infrastructure. Directly comparable to Onterris given overlapping air quality, water consulting, remediation, and environmental compliance offerings across similar industrial verticals.
• ERM (Environmental Resources Management): World's largest pure-play sustainability and environmental consultancy, providing EH&S, permitting, remediation, and climate advisory services. Closely aligned with Onterris' systems-thinking approach and integrated environmental solutions model.

Broad incumbents

• AECOM: Global infrastructure consulting firm with significant environmental services, water, and remediation practices. Comparable in environmental services offering but competes from a substantially larger diversified platform with deeper engineering bench.
• WSP Global: Global professional services consultancy with strong environmental and earth sciences capabilities. Overlaps with Onterris across air, water, permitting, and remediation, but at a much broader engineering and design scale.
• Stantec: Engineering, architecture, and environmental consulting firm serving water, infrastructure, and energy clients. Comparable to Onterris in environmental assessment, water, and remediation services, though part of a much larger multi-disciplinary portfolio.
• Jacobs Solutions: Diversified professional services firm with a major environmental and water business serving energy, infrastructure, and government clients. Overlaps with Onterris in air quality, remediation, and federal compliance but operates at much larger scale across many non-environmental disciplines.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xtwitter.com/onterris
• YouTubeyoutube.com/@onterris
• LinkedInlinkedin.com/company/onterris
• Facebookfacebook.com/156378828058321

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 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 Horizon