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Oil and Gas APENs

  

February 2026 update: New electronic air quality forms

The Air Pollution Control Division is currently transitioning to electronic forms. Visit the electronic submission web page to determine if the form you need is available electronically. If the form is not listed, please complete and submit the PDF version and submit via email or mail.

The air division will launch a new electronic submission process for minor source permits in spring 2026. This new process will use the same online submission tool that now includes electronic forms for a variety of Air Pollutant Emission Notices (APENs). 

Starting June 2026, the division intends to only accept APEN and minor source permit application materials via the new electronic process. June 2026 is a target date. The division will confirm sunset date(s) for older submission processes later in spring 2026.

The division anticipates launching a new electronic submission process for Title V operating permits in summer 2026. The new process will also use the same online submission tool.

  

Reminders:

Application process

The division rejects incomplete permit applications. For more information, visit the division’s APENs and air permits web page and the application rejection frequently asked questions web page.

If your source (equipment) type is not listed below, please use the General Air Pollutant Emission Notice form (Form APCD-200). A guidance document is available for each form.

APENS

This is a generic form used to obtain an air permit for a new source of air emissions, modify an existing air permit, request an administrative amendment to an existing air permit, or complete a routine (five-year) Air Pollutant Emission Notice renewal even when there is no change to an existing permit. When an equipment-specific Air Pollutant Emission Notice exists for a given source, it must be used instead of the General Air Pollutant Emission Notice. 

This form will not be accepted for reporting emissions from gas venting activities, including maintenance/blowdown events (use Gas Venting Form APCD-211), or hydrocarbon liquid loading operations (use Hydrocarbon Liquid Loading Operations Form APCD-208).

Submit Form APCD-206 to report new or existing natural gas amine sweetening systems, complete a routine (five-year) Air Pollutant Emission Notice renewal, request permit modifications, or report changes in emissions, production, or equipment.

Submit Form APCD-220 to report a new or existing operation, complete a routine (five-year) APEN renewal, request a permit modification, or report changes in emissions, production, or equipment. Use this form to report boilers, hot oil heaters, process heaters and similar equipment.

This form is available online and in PDF format. Use the PDF version if you prefer the traditional format and email the completed form to cdphe_apcd_ssp_application@state.co.us.

Submit this notice to report new or existing condensate storage tanks for both E&P and midstream oil and gas operations.

If you prefer to submit your form online, submit the Well Production Facility APEN: Form APCD-216 form with the online submission tool.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

This form is available online and in PDF format. Use the PDF version if you prefer the traditional format and email the completed form to cdphe_apcd_ssp_application@state.co.us.

If you prefer to submit your form online, submit the Well Production Facility APEN: Form APCD-216 form with the online submission tool.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

Submit this notice to report new or existing crude oil storage tanks for both E&P and midstream oil and gas operations.

Attach this addendum form to forms APCD 205, 207 or 210 when needed to report additional wells.

Submit Form APCD-235 to report facility-wide greenhouse gas emissions. This emission notice is required to be submitted annually on or before December 31 of each year, starting on or before Dec. 31, 2023, for facilities directly emitting CO2e emissions equal to or greater than 25,000 metric tons per year. See Colorado AQCC Regulation 3, Part A, II.A.2. for additional information.

Submit Form APCD-211 to report new/existing emissions from gas venting activities, complete a routine (five-year) Air Pollutant Emission Notice renewal, request permit modifications, or report changes in emissions, production, or equipment. Gas venting activities include emissions from gas/liquid separators, and pneumatic pumps.

Submit Form APCD-202 to report new or existing natural gas dehydration systems using glycols, complete a routine (five-year) Air Pollutant Emission Notice renewal, request permit modifications, or report changes in emissions, production, or equipment.

Submit Form APCD-208 notice to report emissions from hydrocarbon liquid loading operations such as liquid load-out from above-ground storage tanks and liquid load-out from pressurized storage tanks (if reportable).

This form is available online and in PDF format. Use the PDF version if you prefer the traditional format and email the completed form to cdphe_apcd_ssp_application@state.co.us.

Submit Form APCD-207 notice for produced water tanks in oil and gas operations.

If you prefer to submit your form online, submit the Well Production Facility APEN: Form APCD-216 form with the online submission tool.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

Submit APCD-213 to report new/existing emissions from routine or predictable gas venting activities, complete a routine (five-year) Air Pollutant Emission Notice renewal, request permit modifications, or report changes in emissions, activities, or equipment. If necessary, also submit APCD-215.

Routine or predictable gas venting activities include emissions from blowdowns of equipment/vessels, pigging, well unloading, downhole well maintenance, and other blowdown events. Refer to PS Memo 20-04 for more information on this source and APEN guidance. 

Submit this notice to report new or existing internal combustion engines or generators, complete a routine (five-year) Air Pollutant Emission Notice renewal, request permit modifications, or report changes in emissions, fuel use or equipment. Provide all applicable information on the form.

Diesel engines that are subject to the New Source Performance Standard (NSPS)-40 CFR Part 60 Subpart IIII must submit the following APEN addendum form with form APCD-233 (this is required only for initial applications and AOS permanent replacements, for affected engines, this is not required for modifications or APEN Updates):

Submit the Well production facility APEN Form APCD-216 notice to report emissions from new well production facilities registering under general permit GP09 or GP10. Refer to PS Memo 20-03 for more information on this source.

This form is available online and in PDF format. Use the PDF version if you prefer the traditional format and email the completed form to cdphe_apcd_ssp_application@state.co.us. 

If you prefer to submit your form online, submit the Well Production Facility APEN: Form APCD-216 form with the online submission tool.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

Contact us

Questions? Email the CDPHE Air Pollution Control Division at cdphe_apcd_ogpermitting@state.co.us.

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