The California Air Resources Board recently notified stakeholders of the upcoming phase out deadline for Tier 3 portable diesel engines on December 31st, 2025. Please note, this update is for CARB registered equipment. The San Joaquin Valley Air Pollution Control District has a different set of requirements. The model year specifications for the CARB registered equipment are as follows:
- PERP Units owned by small fleets and built prior to 2009, rated at 50 bhp up to 750 bhp
- PERP Units owned by large fleets and built on or after 2009, rated between 50 bhp to 750 bhp
If this equipment was registered under CARB’s Portable Equipment Registration Program (PERP), or otherwise subject to CARB’s Portable Diesel Engine Airborne Toxic Control Measure, they will no longer be able to operate in California after the December 31st deadline.
There are phase out exemptions allowed in order to maintain use of the affected equipment. Exemptions are provided to facilities that can provide written documentation that:
- The equipment operates less than 200 hours per calendar year
- Is limited to emergency use only
- Or has been retrofit with level-3 verified emission control technology
The first two exemption provisions must be applied for between January 1st – 31st, and must include photos of the hour meter read on January 1, 2026. The third exemption option listed must be applied for prior to December 31st of this year. Stay tuned for more updates.