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.
Sectors
Access deep environmental expertise tailored to your industry, with solutions built for real-world conditions.
Solutions
Prepare for escalating environmental risks with expert solutions designed to perform under pressure.
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.
Cuture & Careers
Where brilliant people come together to turn environmental science into real-world progress for communities, industry and the planet.

Testing & Analysis

Turning defensible data into decisive action
Laboratory technician performing environmental testing.
Field technician servicing solar-powered environmental monitoring equipment in a remote outdoor location
INTRO

Defensible data is the foundation of environmental clarity

Environmental decisions rely on accurate, independent data to understand impact, verify performance and maintain compliance across operations. Across air, water and soil, our testing and analysis services provide the evidence organizations need to operate with confidence.

Our specialists combine advanced field measurement, laboratory analysis and technical expertise to deliver reliable environmental data validation across complex operating environments.

By combining environmental data collection with insight-led interpretation and deep regulatory understanding, we help organizations move beyond measurement to make informed decisions, manage compliance risk and maintain operational continuity.
Why it matters

Data alone does not solve environmental complexity

Environmental systems are becoming more interconnected, while regulatory expectations and stakeholder scrutiny continue to increase. Organizations must manage emissions, water quality and emerging contaminants across multiple environments, often in real time and under evolving requirements.

Testing generates data, but without accurate interpretation and context, it does not provide the clarity that decision-makers rely on to act with confidence. Disconnected measurement programs, inconsistent methodologies and limited analytical insight can leave organizations exposed to risk, compliance challenges and operational disruption.

With our comprehensive testing, analysis and interpretation, supported by environmental monitoring programs, emissions factor analysis and real-time monitoring technologies, organizations can reduce uncertainty, strengthen compliance and make confident environmental decisions in increasingly complex environments.
Lab employee working with sample vials and laboratory equipment.
Oil refinery facility with distillation towers and industrial processing units at a petroleum refinery
Technical specialists collaborating to deliver accurate environmental data and operational insights.

Environmental clarity proven in practice

Delivered defensible emissions data for regulatory approvals

Validated environmental performance across multi-site operations

Enabled real-time monitoring across complex industrial facilities

Resolved compliance challenges through targeted emissions testing

Strengthened air quality management through air dispersion modeling

Provided independent data for regulatory and legal scrutiny

Testing & Analysis Services

Digital environmental monitoring equipment displaying air quality data.

Ambient Air Monitoring Services

Air quality doesn’t stop at the fenceline, and neither does regulatory or community scrutiny.
Laboratory scientist analyzing environmental samples in an accredited testing laboratory.

Laboratory Services

Environmental decisions depend on laboratory data that holds up under scrutiny.
Oil refinery facility with distillation towers and industrial processing units at a petroleum refinery

Leak Detection Services

Industrial facilities can contain thousands of components that release methane or volatile organic compounds (VOCs).
Woman wearing a yellow vest and looking through binoculars while standing in a field with homes and mountains in the background.

Stack Testing Services

Regulatory compliance starts at the source of emissions, where accurate measurement is critical to operational performance and environmental responsibility.

Precision, consistency and confidence in every result

We combine advanced field measurement, in-house laboratory analysis and technical interpretation to deliver environmental data that is accurate, defensible and ready for confident decision-making.
Close-up shot of water bubbles

Explore Related Content

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Rethinking Emissions Monitoring as a Tool for Operational Assurance

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Landfill Gas Is the Ultimate Test of Environmental Maturity

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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.

Your Bottling Plant Measures Almost Everything. Why Not CO2 Loss?

Tracking carbon dioxide (CO₂) loss helps plants reduce emissions, prioritize repairs and protect margins

When Landfills Run Hot: Why Leachate Strategy Matters

Learn how elevated temperature landfills can change leachate chemistry, treatment needs and costs and why early characterization and contingency planning matter.

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.

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

A Smarter Air Permitting Strategy for a Texas Refinery

Strategic planning creates a more efficient permitting pathway and keeps critical refinery modernization on schedule

The Industrial Wastewater Paradigm Shift: From Treatment to Resource Recovery

Why forward-thinking industries are transforming wastewater from a compliance cost into a strategic source of water, energy and valuable materials

Odor Complaints Need Chemistry

Odor complaints often begin with someone reporting a smell in the environment: rotten eggs, chemical-like or something foul

“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

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?”

Preparing for the 2026 PCWP NESHAP Amendments

New emissions compliance requirements mean additional planning and action for new and existing plywood, composite wood product and kiln-dried lumber facilities

Why the AFFF Transition Is Becoming a Major Engineering and Liability Test

As fluorine-free foam becomes the industry standard, facility operators are finding that the real challenge is not choosing a replacement, but addressing what legacy systems reveal during the transition.