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PERP Regulation
PERP Home Page

Regulation Applies To:
Portable Engines
- Any Fuel Type
- No Gas Turbines (except TSE)

Portable Equipment Units
- Any device that emits only PM.
   - Crushers
   - Screening Plants
   - Wood Grinders
   - Concrete Batch Plants
   - Abrasive Blasting
► Exempt: ▼ Exempt:
  • - Equipment owned by agricultural cources (not rental)
    - Engines powering mobile vehicles or equipment (self-propelled)
    - Any engine or equipment unit that resides at a location for more than 12 consecutive months
    - Any engine or equipment that qualifies as part of a stationary source permitted by a local Air District

  The Portable Equipment Registration Program (PERP) is a voluntary program for the registration of portable engines and equipment units. WIth certain limited exceptions, portable equipment registered in PERP may operate throughout the state without obtaining permits from any of California's local Air Quality Management or Air Pollution Control Districts (Air Districts).

Please be advised that ARB is currently in the process of amending the PERP regulation and Portable Engine ATCM. During this time, ARB will not enforce the fleet standard in the Portable Engine ATCM. For more information please see Enforcement Advisory 347.

To recieve the latest information regarding the amendments, and to stay up to date with all things PERP, please join the Portable Listserv.

The following are currently eligible for initial registration in PERP:


Engines:
- Engines certified as Tier 4 Final
- Tier 4 interim engines between 75bhp - 174bhp
   and greater than 750bhp
- Engines built to the flexibility provisions of 40CFR
   89.102 or 1039.625.
- Currently permitted by a district and the permit was
   originally issued before February 19, 2011


Equipment Units:
- Any equipment unit is eligible if equipped with
   appropriate PM emission controls
- Rock crushing and/or screening plants must submit
   diagram with application
- Any equipment unit equipped with dust collectors
   must submit manufacturer specifications that the
   collection efficienty is 99%


 

Please note:

If your engine is not eligible for PERP, you must contact your local Air District to inquire about permit requirements.



Application forms must be submitted for any action in PERP. All application forms have instructions and must be submitted via regular mail to ARB (fax or email NOT accepted).

Download Application forms
Which forms should I use?

Fees - All applications must be submitted with the applicable fees. You may include a check or pay with a credit card using form ASD/Fiscal 307. All program fees are listed on Form 1A.

Renewals - You do not need to send in a form for renewal of registration. Renewal invoices will be sent to the mailing address on file approximately 90 days prior to the expiration date. If you need to update your mailing address, please submit Form 8.
 

Although ARB issues the PERP registration, the primary enforcement of the requirements is conducted by the Local Air Districts. It is required that you keep the registration documents on site at all times.

Inspections:
Within 45 days of receiving either initial registration or renewal, the registration holder must contact the home district to make an appointment for an inspection. This inspection must occur within 1 year of registration issuance date. The home district is defined as the Local Air District where that engine or equipment unit operates most of the time. The home district will be listed on the registration and can only be changed at renewal.

List of Local Air Districts

Notifications:
If a registered equipment unit will be at a location for more than five (5) days, then notification to the Local Air District is required. This notification may be performed electronically through the ARB website. Notification is NOT required for engines.

Online Notifcation

Portable vs. Stationary Operation
In genreal, PERP-registered engines and equipment units may not be operated as part of a stationary souce, nor may they replace stationary operations. If you are not sure if your specific operation qualifies as stationary, please consult your local air district. The local air districts have created a guidance document for several scenarios. PERP vs Stationary Guidance.

► 1. What types of equipment needs to be registered? ▼ 1. What types of equipment needs to be registered?
  •    Nothing is required to be registered in PERP. Registration in PERP is completely voluntary. The permit requirement at the local air district is mandatory, however. The type of portable equipment that needs a permit is determined by the local air districts only. An owner/operator of portable equipment that needs a permit may then choose to register in PERP in lieu of having to get a permit from the air districts.

► 2. How long does it have to be moved away to a different location before it can be considered portable again? ▼ 2. How long does it have to be moved away to a different location before it can be considered portable again?
  •    Section 2452(cc)(3) of the definition of portable prohibits the movement of equipment from one location to another in an attempt to restart the 12 month clock. It must be moved to a different location for a legitimate business purpose in order to get another 12 months at the new location. It is recommended that you consult your local air district in these cases.

► 3. What happens if my portable engine is not eligible for PERP? ▼ 3. What happens if my portable engine is not eligible for PERP?
  •    If your engine does not meet the PERP eligibility requirements, you must contact your local air district to inquire about permitting requirements. Although some local air districts may be able to issue permits for engines that do not meet the current nonroad or on-highway emission tier, other districts may choose not to issue a permit for these engines.

► 4. Why did I get two separate stickers for each registration? ▼ 4. Why did I get two separate stickers for each registration?
  •    Since the beginning of the program, an identification sticker was sent with the registration and was required to be placed directly on the registered engine or equipment unit. When placards started being required in 2007, it was decided that an additional sticker should be sent in case the registration holder wanted to put it on the placard. Technically, only one identification device is required to be placed on the registered engine or equipment unit. Putting one sticker on the placard satisfies this requirement.

► 5. How long can I use my certified engine until it has to be placed out of service? ▼ 5. How long can I use my certified engine until it has to be placed out of service?
  •    It depends on the other engines in your fleet. In the future, portable engines are subject to the fleet standards in the Portable Engine ATCM. In 2013, 2017, and 2020, the particulate matter emissions from the diesel engines are averaged together to see if they meet the standard. If your fleet average emissions are above the standard, then you must clean up your fleet by replacing older engines or adding on controls such as diesel particulate filters (DPF).

► 6. What if I am not able to comply with the 2017 fleet standard in the ATCM? ▼ 6. What if I am not able to comply with the 2017 fleet standard in the ATCM?
  •    Please be advised that ARB is currently in the process of amending the PERP regulation and Portable Engine ATCM. During this time, ARB will not enforce the fleet standard in the Portable Engine ATCM. For more information please see Enforcement Advisory 347.

For other questions not listed here, please review the complete Portable FAQ Document.
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