Emissions Compliance Testing
Meeting HON, NESHAP, and state deadlines with confidence
why it matters
Reliable emissions data is critical to compliance and operational continuity
Emissions compliance depends on accurate source data, clear planning and documentation that can withstand regulatory review. Without a reliable testing program, facilities can face missed obligations, reporting uncertainty, operational disruption and added risk during audits, permit reviews or enforcement inquiries.
- Meet permit requirements with defensible source testing
- Plan routine testing with fewer disruptions and delays
- Navigate complex regulatory requirements and pollutants
- Reduce risk from incomplete or inaccurate compliance data
- Respond to specialized regulatory testing needs
Stack testing for routine and complex emissions compliance programs
Onterris helps clients plan, execute and document emissions compliance testing programs across regulated source types. Our teams combine logistics, regulatory understanding, field testing and data analysis to support accurate results and efficient compliance execution.
Our capabilities
Routine emissions compliance testing
Compliance planning and permit review
Regulatory pollutant guidance
Air toxics and hazardous air pollutant testing
Complex and comprehensive performance testing
Data analysis and compliance reporting
Related Services
Environmental Permitting, Air & Water Compliance Services
Working through air, water and land permitting requirements and building compliance programs that hold up under regulatory review, across regulated industries.
Explore Related Insights
Federal Methane Rules in 2026: What Oil and Gas Operators Need to Do Now
Operators that act on measurement, documentation and system readiness now will strengthen performance and stay ahead of compliance
The Role of Stack Testing in OGMP 2.0 Gold Standard
Applying the power of FTIR stack testing to quantify methane slip and reconcile inventories with confidence
Continuous Emissions Monitoring Systems: A Key Enabler of Permit Protection
Real-time emissions data does more than meet EPA requirements, it protects operations and strengthens compliance decisions
LNG Methane Emissions Measurement & Monitoring
Learn how direct methane measurement across LNG loading, shipping and unloading helps operators strengthen emissions data, compliance and market access.