Reminder for the Upcoming Phase Out Deadline:
December 31, 2026 Phase Out Date
This is the phase out date for Tier 3 portable diesel engines:
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Owned by small fleets and built prior to 2009 rated 50 brake horsepower (bhp) to 750 bhp; and
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Owned by large fleets and built on or after 2009 rated 50 bhp to 750 bhp
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 do not apply to large fleets enrolled in the fleet averaging compliance path.
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, 2026.
The engine tier and phase out date are listed on each applicable PERP registration certificate. To continue operation past the phase-out date, you must submit a modification request using PERP Form 20 and elect one of the following options.
Option 1
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Must be postmarked between January 1 and January 31, 2026 and include an hour meter reading taken at the beginning of January 2026.
Modify to either:
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Low use (limited to 200 hours per calendar year); or
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Emergency use (limited to emergency operation only).
Option 2
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Must be postmarked on or before December 31, 2026
Contact
If you have any questions please contact portable@arb.ca.gov.
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