Equipment Registration

Desert Skyline

Certain equipment that would otherwise require a permit according to District Rule may instead be registered with the District.

This page contains information on forms, fees and other important information for obtaining a District registration for this equipment allowing operation in San Diego County. For information on obtaining a registration valid throughout the state of California including San Diego County, please see the California Air Resources Board (CARB) Portable Equipment Registration Program (PERP) page.

Equipment that is eligible for registration is described in District Rule 12 and Rule 12.1 including:

Equipment eligible for registration under Rule 12 (stationary/portable equipment):

NEW NEW NEW Boilers above 2 MMBtu/hr and less than 5 MMBtu/hr (natural gas, propane, or liquid fired)
Applications to register these boilers may not be submitted until April 1, 2021.  Applications for existing boilers are required no later than July 1, 2021.

Stationary emergency internal combustion engines (Installed prior to November 15, 2000)

Stationary engines rated less than or equal to 200 bhp operated for fewer than 200 hours per calendar year (Installed prior to November 15, 2000)

Asphalt roofing kettles and day tankers

Rock drills

Equipment eligible for registration under Rule 12.1 (portable equipment):

Internal Combustion Engines

Rock Crushing and Screening Equipment

Concrete Batch Plants

Unheated Asphalt Pavement Crushing/Recycling

Please note that equipment which operates as part of a stationary source may require a District permit instead of a registration with the District or CARB. The California Air Pollution Control Officers Association (CAPCOA) has prepared guidance on acceptable uses of portable equipment. If you have additional questions please do not hesitate to contact the District.

Application Forms

District Rule 12 and Rule 12.1 require the submittal of the District's general permit application form and supplemental form(s) that apply to the equipment being registered as listed below. Some equipment types have only a certificate form. This form contain  s applicable requirements for the equipment type and will be stamped/signed by a District engineer and the copy given to you will serve as our registration until a final version is mailed to you. Other equipment types have additional supplemental forms that must be included with your application for the District to evaluate whether the equipment meets the requirements for registration.

General Application Word PDF ***REQUIRED FOR ALL APPLICATIONS***


Equipment Specific Forms - Rule 12 Equipment Types

Medium Boilers (> 2MMBtu and < 5 MMBtu/hr):
Existing Boilers (Installed prior to 7/1/2021) Certificate Form (PDF)
New Boilers (Natural gas/propane only, or natural gas/propane with liquid fuel backup)
New Boilers (Natural gas/propane or liquid fuel as primary fuel)

Asphalt Roofing Kettles:

Asphalt Roofing Kettle Certificate Form (PDF)

Grain Silos:
Grain Silos (Breweries <100,000 bbl/yr) Certificate Form (PDF)

Paper Shredders:
Paper Shredders (>600 lbs/hr) Certificate Form (PDF)

Rock Drills:

Rock Drill Certificate Form (PDF)

Existing Stationary Internal Combustion Engines - Installed prior to November 15, 2000 (select correct form based on engine type and emission level. Generally engines fueled by gasoline, natural gas or propane fuel use spark ignition.):

Existing Stationary Spark Ignition Engine (emergency):
Spark Ignition Engine (emergency) Certificate Form (PDF)

Existing Stationary Spark Ignition Engine (<200bhp, <200 hr/yr): 
Spark Ignition Engine (<200 bhp, <200 hr/yr) Certificate Form (PDF)

Existing Stationary Diesel Engine (emergency, PM > 0.4g/bhp-hr):
Existing Diesel IC Engine (Commerical, Institutional, Residential Facility) Certificate Form (PDF) *
Existing Diesel IC Engine (Non-Commerical, Non-Institutional, Non-Residential Facility) Certificate Form (PDF) *
Existing Diesel IC Engine Supplemental Form (PDF)

Existing Stationary Diesel Engine (emergency, PM <=0.4 g/bhp-hr): 
Existing Diesel IC  Engine (Commerical, Institutional, Residential Facility) Certificate Form (PDF) *
Existing Diesel IC  Engine (Non-Commerical, Non-Institutional, Non-Residential Facility) Certificate Form (PDF) *
Existing Diesel IC Engine Supplemental Form (PDF)

*If you do not know the particulate emission level of your engine or emission data indicates emissions above 0.4 g/bhp-hr, select the first form which allows 20 hours per year for maintenance and testing operations. If there is documentation that PM exhaust emissions are less than or equal to 0.4g/bhp-hr, than the engine may be operated up to 30 hours per year for maintenance and testing purposes and the form labeled (PM<=0.4g/bhp-hr) should be completed and the data demonstrating the emission level should be attached to the application.


Equipment Specific Forms - Rule 12.1 (portable) Equipment Types

Portable Abrasive Blasting
Portable Abrasive Blasting Certificate Form (PDF)
Portable Confined Blasting Supplemental Form (PDF)
Portable Unconfined Blasting Supplemental Form (PDF)

Portable Sand and Aggregate Screening (no Crushing)

Portable Sand and Gravel Screening Certificate Form (PDF)
Portable Sand and Gravel Screening Supplemental Form (PDF)

Portable Rock Crushing (may include Screening)
Portable Rock Crushing Certificate Form (PDF)
Portable Rock Crushing Supplemental Form (PDF)

Portable Concrete Batch Plants or Similar
Portable Concrete Batch Plant Certificate Form (PDF)
Portable Concrete Batch Plant Supplemental Form (PDF)

Portable Spark Ignition Engine (typically gasoline, natural gas, propane)
Portable Spark Ignition IC Engine Certificate Form (PDF)
Portable IC Engine Supplemental Form (PDF)

Portable Compression Ignition (Diesel) Fired Engine (non-emergency) meeting current tier
Portable Diesel-Fired IC Engine Certificate Form (PDF)
Portable IC Engine Supplemental Form (PDF)

Portable Diesel IC Engine (Emergency or Low-Use)
Portable Diesel IC Engine (Emergency or Low-Use) Certificate Form (PDF)
Portable IC Engine Supplemental Form (PDF)

Portable Prime Diesel Engine - ATCM Exempt 
Portable Prime Diesel Engine - ATCM Exempt (PDF) 
Portable IC Engine Supplemental Form (PDF)

Asphalt Pavement Crushing/Recycling

Unheated Pavement Crushing/Recycling Certificate Form (PDF)
Pavement Crushing/Recycling Supplemental Form (PDF)

Additional Supplemental Forms Required for some Portable Engines: 
Engine Compliance Checklist
Associated Equipment Compliance Checklist
Modification to Registration or Registered Emission Unit
Proof of Residency for Portable IC Engines (34X-Series)
Portable Engine Timing Retard Certification Form (34X-Series)

Each application submitted must include the general application form, the applicable equipment specific certificate form and any supplemental forms listed under the equipment type. For portable engines, the District may require one of the special supplemental forms listed above. For modifications to existing registrations, please include a completed modification form as listed above. Please contact the District prior to submittal to determine if any of these forms is required. 

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This section contains estimated fees required for registration application submittal.

The correct fee, as shown in the table(s) below, must be submitted with your application in order for it to be accepted. Please note that the fees listed in these tables are estimated and the final fee may be more or less than this amount based on time and materials spent processing the application. The District maintains work records for this purpose.

Portable Abrasive Blasting
Asphalt Kettle/Tanker
Medium Boilers (> 2MMBtu and < 5 MMBtu/hr)
Grain Silos (Breweries<100,000 barrels per year)
Paper Shredders
Portable Rock Drill
Portable Screen Set
Portable Rock/Concrete Crushing System
Portable Concrete Batch Plant
Stationary Engines (Eligible for Rule 12 registration)
Portable Engines
Asphalt Crushing/Recycling

If you are unsure of the correct fee contact the District (see bottom of page) to obtain an application fee estimate to confirm the fees required for application submittal. Please note that an additional fee may also apply depending on the method of payment. A breakdown of how the application fee(s) are determined can be seen here. Additional information can be found in District Rule 40.

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How to Pay

These fees may be paid by check payable to "Air Pollution Control District" or by credit card (Visa, MasterCard, Discover, and American Express). 

If you choose to email or fax your application and intend on paying with a credit card, you must provide contact information (name and phone number) so that the District can complete payment.

Please note that credit card payments are assessed a transaction fee of 2.19% that is charged by the credit card provider.

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How to Submit Application Packet



Permit Processing

10124 Old Grove Rd

San Diego, CA 92131-1649


(858) 586-2601

For the fastest processing, applications may also be hand delivered to the mailing address listed above.

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Application Status

The District will act on complete applications as soon as possible but at most within 90 days. The engineer assigned to your application will review it and contact you within 30 days of receipt to confirm that it is complete or request additional information. For most complete applications that comply with District Rules, the District will sign and stamp the initial registration certificate within 1 business day of receipt; however, more complex applications may take additional time.

Ensuring your application is complete is the best way to reduce processing time. Complete emissions data is the most important factor in minimizing application processing time and iterative information requests. If you have any questions about what information is required, please contact the District using the information at the bottom of this page. Learn more about the rules that govern application processing time. 

Sign up for Citizen Access to get up to date information on the status of your application.

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ATCM for Stationary Compression Ignition Engines (Stationary ATCM) - Applies to stationary engines that combust diesel fuel, so may apply to engines registered under Rule 12. Common requirements of the Stationary ATCM include limiting testing and maintenance operation and keeping records of operation and maintenance.

ATCM for Portable Engines (Portable Engines) - This rule applies to engines that combust diesel fuel and are considered portable under the rule, so may apply to engines registered under Rule 12.1. Common requirements of the Portable ATCM include purchasing a current tier engine and meeting fleet averaging standards.

RICE NESHAP - This EPA rule applies to both spark ignition and compression ignition stationary engines, so may apply to engines registered under Rule 12. Typical requirements of this rule include maintenance and operating requirements. The District will evaluate your application and include any applicable requirements of this rule in an authority to construct.

NSPS Subpart OOO - This EPA rule applies to any portable rock crushing plants with a maximum processing rate of more than 150 tons per hour including asphalt crushers/recyclers. If your registered equipment will exceed this threshold, contact the District prior to submittal to determine potential requirements and application evaluation fees.

The engineer assigned to an application will review the proposed equipment to determine the requirements of these regulations that may apply and include them as conditions in your authority to construct.

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District Rules

Several District rules may apply to your equipment. General rules that may apply to your equipment include Rules 5051525354 and 62.

District Rule 12 and Rule 12.1 contain specific requirements for each equipment type being registered. Requirements can be found in the applicable rule and are also listed on the certificate application for the equipment type. A complete listing of the District's rules can be found here.

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Calculation Procedures and Additional Resources

These procedures may be utilized to ensure that your equipment meets all applicable rules and regulations and is eligible for registration prior to application submittal.

Abrasive Blasting Emission Calculation Procedures - This page contains procedures to be used for calculating emissions from abrasive blasting equipment. 

Mineral Products Industry Calculation Procedures - This page contains procedures that should be used to calculate emissions from equipment such as crushers, screens, conveyers, storage piles and other mineral products industry related emissions associated with the registered emissions unit.

Combustion Equipment Calculation Procedures - This page contains procedures that should be used to calculate emissions from registered engines. 

AP-42 - An alternative compilation of emission factors and calculation procedures prepared by the EPA that may be utilized by the District in some situations for some equipment types. 

EPA Certification Information - This page contains spreadsheets with emission factors for engines certified by the US EPA. Data is available for most diesel engines and certified spark-ignition engines and can be looked up by model year and EPA engine family name.

CARB Executive Orders - Use this link to obtain emission factors for certified diesel engines from the California Air Resources Board (CARB). Data can be looked up by engine manufacturer, model year and EPA engine family name.

Stationary Engine Compliance Information - Contains useful information prepared by the District for staying in compliance with stationary engine permit requirements.

Forms and Compliance Policies - See this page for compliance related forms (including reporting form templates) and compliance advisories that may be relevant to your equipment.

Portable Equipment Compliance Information - Helpful information for determining whether your equipment is considered portable and other useful compliance information for portable equipment.

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Obtain Assistance 

Need Help? Have Questions?

Email the District or call (858) 586-2600 and ask for the duty engineer.

More in depth help and site visits can be performed by the District Small Business Assistance Program Coordinator who can be reached at (858) 586-2656.