When must I conduct subsequent performance tests?

If you use a control system (add-on control device and capture system) to meet the emission limitations, you must also conduct a performance test at least once every 5 years following your initial compliance demonstration to verify control system performance and reestablish operating parameters or operating limits for control systems used to comply with the emissions limits. [67 FR 45598, July 9, 2002, as amended at 89 FR 94908, Nov. 29, 2024; 91 FR 37276, June 22, 2026]