Stack Testing and Source Emissions Testing Services

Solutions Testing & Analysis Stack Testing and Source Emissions Testing Services

Stack Testing and Source Emissions Testing Services

A large industrial facility with tall smokestacks releasing thick clouds of emissions at sunrise, overlooking a frozen river and a snow‑covered cityscape.

INTRO

Accurate, EPA-compliant stack testing for industrial facilities

Regulatory compliance starts at the source of emissions, where accurate measurement is critical to operational performance and environmental responsibility. Partnering with Onterris gives you confidence every step of the way.

Our stack testing teams measure emissions at the source using approved EPA and regulatory methods. By combining experienced field specialists, advanced monitoring technologies and accredited laboratory analysis, we deliver data you can use for permits, compliance and operational decisions.

Supporting Your Industry

Organizations in highly regulated, complex industries rely on our comprehensive air quality testing and analysis expertise to ensure regulatory compliance, operational efficiency and environmental progress.

Chemical

Energy

Government

Manufacturing

Methane

Solid Waste

why it matters

Stack testing that stands up to scrutiny

Tightening federal, state and local requirements
Data that holds up to regulatory scrutiny and audits
Consistent methods across facilities and vendors
Lower risk from delayed or uncertain results

Delivering Accurate Emissions Data to Support Compliance and Operational Confidence

Onterris helps clients plan, execute and document stack testing programs that generate defensible emissions data, support regulatory compliance and inform operational decision-making across routine and complex source testing scenarios.

Air toxics and emissions compliance testing

Continuous emissions monitoring (CEMS)

We implement continuous emissions monitoring system testing programs that support real-time emissions measurement, system validation and ongoing compliance across regulated operations.

Ethylene oxide compliance monitoring
Initial performance specification tests (PST) and quarterly audits
Annual relative accuracy test audit (RATA)
Temporary CEMS during maintenance or replacement

Boiler and combustion emissions testing

We conduct boiler and combustion emissions testing programs that support accurate source measurement, performance evaluation and compliance across boilers, heaters, turbines and flares.