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Emission Evaluation & Stack Testing for Air Quality

Directions for sampling notifications and reports, and links to technical guidance on stack testing of emissions. Resources include stack test methodology and requirements for compliance and performance tests. Find information on Continuous Emission Monitoring System (CEMS) and Predictive Emission Monitoring System (PEMS) certification, performance evaluation, Relative Accuracy Test Audits (RATAs), and performance specifications.

If your facility requires initial or continuous demonstration of compliance for air emission standards, you may need to conduct stack testing (also referred to as source sampling, emission testing, or performance testing) on the timeline designated in your applicable state and/or federal rules.

Most facilities that conduct stack testing must meet reporting and notification requirements as established in their applicable permits and state and federal rules.

Stack Test Online Reporting System (STORS)

On May 22, 2023, the Stack Test Online Reporting System (STORS) module became available in STEERS (State of Texas Environmental Electronic Reporting System) to accept stack test documents (reports and notifications) electronically.

This module applies to anyone required to submit initial or continuous demonstration of compliance for air emission standards or stack tests, which are also referred to as source sampling, emission testing, or performance testing. This will not replace any reporting required by the EPA.

Beginning January 1, 2024, all stack test notifications must be submitted using the online electronic reporting system.

Beginning July 1, 2024, all stack test reports must be submitted using the online electronic reporting system. Only one stack test report per source is required. Reports are no longer required to be submitted to the regional offices or Air Permits Division.

Please see the STORS Guidance on how to use and access STORS.

We are making further efforts to streamline and ease your important compliance efforts and we welcome your feedback at STORS@tceq.texas.gov.

The EPA provides other resources with the intent to improve consistency in the information required for test plans, normal load determination, significant figure use, and defining “startup.”