Upcoming Phase-Out Date Reminder
This serves as a reminder of upcoming deadlines for Tier 3 portable diesel engines owned by large fleets that are built prior to 2009 rated at 50 to 750 brake horsepower (bhp). This reminder also applies to Tier 2 engines owned by small and large fleets that are built prior to 2009 rated over 750 bhp.
December 31, 2024 Phase-Out Date
These engines, whether registered in PERP, locally permitted, or otherwise subject to the Portable Diesel Engine Airborne Toxic Control Measure, will no longer be able to operate in California after December 31, 2024.
The engine tier and phase-out date is listed on each applicable PERP registration certificate.
To continue operation past the phase-out date, owners must submit a modification request using PERP Form 20 to add a properly functioning level‑3 verified diesel emission control technology, that will enable full use of the engine after December 31, 2024.
This request must be postmarked on or before December 31, 2024.
PERP Form 20 is located under the Forms & Requirements page in CARB’s dedicated PERP website.
* Large fleets were established on June 30, 2019, and have a total cumulative horsepower over 750 bhp for all portable engines under common ownership and control of the fleet. These deadlines only apply to large fleets following the phase out compliance pathway.
Contact
If you have any questions please contact portable@arb.ca.gov.
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