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

  • Boilers above 2 MMBtu/hr and less than 5 MMBtu/hr (natural gas or propane)
  • 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.  Click here for additional guidance on acceptable uses of PERP Equipment

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 (Installed on or after 7/1/2021) Certificate Form (PDF)

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 (Commercial, Institutional, Residential Facility) Certificate Form (PDF) *
Existing Diesel IC Engine (Non-Commercial, 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 (Commercial, Institutional, Residential Facility) Certificate Form (PDF) *
Existing Diesel IC  Engine (Non-Commercial, 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

Portable Unheated Pavement Crushing/Recycling Certificate Form ( ≥ 150 Tons Per Hour)(PDF)
Portable Unheated Pavement Crushing/Recycling Certificate Form (< 150 Tons Per Hour)(PDF)
Pavement Crushing/Recycling Supplemental Form (PDF)

Additional Supplemental Forms Required for some Portable Engines: 
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. 

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.

Fee Tables

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 Assistance tab) 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.

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, ensure that you have obtained your fee estimate and have it in hand, and then after submitting the application, you must contact the District over the phone at (858)586-2600 to provide payment information.

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

Citizen Access
Select equipment type applications can now be submitted online.

Fax: (858) 586-2601

Permit Processing
10124 Old Grove Rd
San Diego, CA 92131-1649

The District will act on complete applications as soon as possible but at most within 180 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. Typically permits are issued in about 60 days. More complex processes will take longer. Common reasons that applications may take longer than 60 days to evaluate include: the project is a complex project specifically at a major source, if the project requires a mandatory public notice period due to being installed within 1000 feet of a school or triggering the requirement for a air quality impact analysis (AQIA), if they do not initially pass a health risk assessment (HRA) or AQIA, if BACT is not proposed or complete BACT analysis is not submitted or for major sources if actual emission data is not included.

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 on the Assistance tab.

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

Learn more about the permitting process and what to expect.


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 (ZZZZ) - 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

District Rules

Several District rules may apply to your equipment. General rules that may apply  include Rules 505152, 5354, 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.

Calculation Procedures and Additional Resources

Equipment Calculation Procedures - This page contains procedures to be used for calculating emissions from this equipment that should be submitted with each application.

Use of these calculation procedures will aid in minimizing application review time and costs.  The correct emission factors should be selected from the list based on equipment. If available, manufacturer provided equipment specific emission data or source test results should be utilized before using default emission factors. Sources of all emission data used must be included as attachments to the application.

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.

Call Duty Engineer
(858) 586-2600

District Small Business Assistance Program Coordinator
(858) 586-2650