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Our Story

The challenges have changed. So have we.

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Innovation

Seeing the full system and improving it.

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Our commitments

Driving long-term value through responsible delivery.

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Locations

Explore our locations across the U.S., Canada and Australia.

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Solutions

Featured Solutions

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Emergency Response

Building readiness for decisive environmental action.

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Stack Testing

Accurate, EPA-compliant stack testing for industrial facilities.

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Leak Detection

Managing fugitive emissions in complex industrial facilities.

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Contact Laboratory Services

Request a quote for advanced laboratory analysis and support.

Our Projects
Our Thinking

Our Thinking Spotlight

The Onterris Outlook Report
NEW REPORT

The Onterris Outlook: Why Environmental Performance Is Business-Critical

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BRIEF

Federal Methane Rules in 2026: What Oil and Gas Operators Need to Do Now

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PERSPECTIVE

CCL 6 Is a Signal, Not a Standard. Why a Science-Forward Strategy Matters Now

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BRIEF

The HON MACT Rule: Shifting Compliance Monitoring to Emissions Intelligence

Culture & Careers
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Who We Are
Onterris is a global environmental solutions company partnering with organizations to solve complex challenges where environmental pressures, regulatory expectations and operational risks intersect.
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Sectors
Access deep environmental expertise tailored to your industry, with solutions built for real-world conditions.
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Solutions
Prepare for escalating environmental risks with expert solutions designed to perform under pressure.
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Our Thinking
Explore briefs, perspectives and articles that turn insight into action. Discover thought leadership that informs decisions and drives impact. See the ideas shaping environmental solutions and guiding your next move.
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Cuture & Careers
Where brilliant people come together to turn environmental science into real-world progress for communities, industry and the planet.
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Energy & Utilities

Aerial view liquid chemical tank terminal.
Brief
3 min read

California SB 1137: Why Early Planning is Crucial for Oil and Gas Operators

Learn how California oil and gas operators can prepare for SB 1137 with early sampling, air dispersion modeling, EDS planning and a defensible LDRP.
Read More
Worker wearing PPE walking near an oil pumpjack in an onshore oil field.
Article
4 min read

Marcellus Gas: Environmental Data & Market Access

Explore how Marcellus gas operators can connect methane monitoring, environmental data and operations to build buyer confidence and support market access.
Read More
Field technician servicing solar-powered environmental monitoring equipment outdoors.
Perspective
5 min read

How Ambient Air Monitoring Provides Context and Transparency for Data Centers

Ambient air monitoring helps data center developers establish pre-construction air quality baselines, track changing conditions and contribute to greater environmental transparency throughout the project lifecycle
Read More
Part of a chemical plant or refinery with fractioning or distillation towers, boilers and pipes for oil and chemicals against a blue sky.
Case study
3 min read

A Smarter Air Permitting Strategy for a Texas Refinery

Strategic planning creates a more efficient permitting pathway and keeps critical refinery modernization on schedule
Read More
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Perspective
5 min read

“Just-in-Time” Compliance: The Hidden Risk Building in Legacy Environmental Programs

Teams in asset-intensive industries now need to recognize indicators of operational risk long before compliance brings them into view
Read More
Article
5 min read

Designing a Modern LDAR Program: Why Compliance Alone Is No Longer Enough

The best LDAR programs no longer ask, “Are we compliant?” They ask, “What are our emissions telling us about our operation?”
Read More
Horizontal color image of a data center from a drone point of view.
Brief
5 min read

7 Things Data Center Operators Need to Know About Engine and Cogeneration Emissions Compliance

Field lessons for improving data quality, control performance and permitting decisions
Read More
Oil pumpjack against a clear blue sky.
Article
5 min read

Can Environmental Programs Keep Pace with Production in the Permian Basin?

Learn how leading operators are building connected, defensible programs that scale with today’s operations and tomorrow’s opportunities
Read More
Construction site with cranes, machinery, and high-rise buildings.
Perspective
6 min read

Where Environmental Commissioning Creates Value in Digital Infrastructure: Closing the Gap Between Construction and Operations

Critical digital infrastructure has a critical gap
Read More
Environmental field scientist collecting a water sample from a stream.
Article
8 min read

Water Availability Is Only the First Water Question in Data Center Site Selection

Evaluate water intake, thermal discharge, aquatic ecology and other permitting constraints before securing a site to reduce development risk and improve schedule certainty
Read More