Index of forms and guidance for oil and gas

Effective September 7, 2022 the Division has updated its registration process for General Permits GP01, GP02, GP05, GP06, GP07, GP08, GP09, GP10 and GP11 to align with recent updates to the construction permitting process. Sources newly seeking coverage under a General Permit need to submit a demonstration of compliance with the National Ambient Air Quality Standards (NAAQS) with the General Permit registration. Consistent with the updates, the Division has created a Permit Application/Registration checklist (Form APCD-100) for General Permit registrations. For more information on the modeling determination process and permit modeling, please visit the Permit Modeling Unit webpage.


Effective August 1, 2023, in order for a General Permit registration to be considered complete, sources with any quantifiable amount of new emissions of NOx, SO2, PM, or CO, must fill out APCD Form-114, submit to the Permit Modeling Unit (PMU), provide PMU's determination with the General Permit registration, and obtain a completeness determination from the Division. If an applicant does not receive notification of a completeness determination from the Division within 60-days of the Division's receipt of the registration, the registration will be deemed complete.* Form instructions are provided here. More information on when APCD Form-114 is required, is provided here.

If you have questions about this new process, you can contact oil and gas permit unit supervisors, Bradley Eades, bradley.eades@state.co.us, or Stephanie Spector, stephanie.spector@state.co.us. If you have specific questions about APCD Form-114, you can contact Miriam Hacker, permit modeling unit supervisor, at miriam.hacker@state.co.us.

*See "General Permit Registration Approval Process" terms within each general permit, which requires a complete registration before commencing construction.



Oil & gas APENs

Your application will be rejected if it is filled out incorrectly, is missing information, missing required forms, or lacks payment for the filing fee. The Form APCD-100 and all applicable forms on that checklist are required with every application. The re-submittal will require a new filing fee. See our Application Rejection Frequently Asked Questions page for more information.


The following application types are exempted from the requirement to submit the Permit Application/Registration Checklist (Form APCD-100):

  • Air Pollutant Emission Notice (APEN) updates only (no changes to permit).
    • Renewal of 5-year APEN term.
    • Update to actual annual emissions, per AQCC Reg. 3, Part A, Section II.C.
  • APEN exempt sources.
  • Permit exempt sources.
  • Administrative permit amendments. (Including but not necessarily limited to name changes, changes in contact information, transfers of ownership, and typographical error corrections.)


General APEN  Form APCD-200  Guidance

Boilers APEN  Form APCD-220 

Well production facility APEN Form APCD-216 |  Guidance

  • Introduction to APENs video.
  • Detailed guidance for calculating your emissions.
  • APEN/permit threshold table.
  • Ozone non-attainment area boundaries.
  • Common APEN or air permit exemptions.
  • APEN update guidance.


Emissions Calculation Manual

Emissions Calculations & Regulatory Analysis Workbook | Guidance

Air permit application forms
PS Memos  Permitting guidance memos.

Air permit administrative forms

General Permits
  • GP01  Condensate storage tanks.
  • GP02  Natural gas-fired internal combustion engines, at oil & gas facilities only.
  • GP03  Land Development.
  • GP05  Produced water storage tanks.
  • GP06  Diesel-fired engines.
  • GP07  Hydrocarbon liquid loadout at oil & gas facilities.
  • GP08  Oil & gas industry storage tanks (condensate, crude oil and produced water).
  • GP09  Oil & gas well production facilities.
  • GP10  Oil & gas well production facilities.
  • GP11  Oil & gas routine or predictable gas venting.

Oil & gas O&M plans 

On November 14, 2022 the Air Pollution Control Division issued revised versions of Operating and Maintenance Plan Templates for the following sources: Amine Sweetening Systems; Condensate, Crude Oil, and/or Produced Water Storage Tanks; Glycol Dehydration Systems, Hydrocarbon Liquid Loadout, Natural Gas-driven Pneumatic Pumps, Process Flares or Emergency Flares, Natural Gas Fired Reciprocating Internal Combustion Engines, and Separators. 

The changes made to the Operating and Maintenance Plan Templates include, but are not limited to:

  • Consolidation of Forms APCD-304: Condensate Storage Tanks, APCD-307: Produced water storage tanks, and APCD-308: Crude oil storage tanks into a single template - APCD-304: Hydrocarbon liquid and/or Produced Water Storage Tanks.
  • Rendering obsolete and removing Form APCD-303: Fugitive component leaks.

O&M Plan guidance and information

Equipment-specific pages

  • Storage tank and vapor control system guidelines.
  • Regulation No. 7 guidance and forms (STEM, AIMM, periodic reporting).
  • Leak detection and repair (LDAR) guidance and forms.
  • Visible emissions observation forms.
  • NSPS OOOO guidance and forms.
  • Compliance test manual.
  • Continuous monitoring system guidelines.
  • Portable analyzer monitoring protocol.
  • Rolling 12-month emission calculation guidance.
  • Malfunction/upset reporting.
  • Gasoline tank truck certification information and form.
  • APCD enforcement and inspection contacts. 
  • ERC stakeholder presentation.
  • Forms to apply for ERCs, use ERCs, or change ownership of ERCs.
  • Frequently asked questions.
  • Fact sheet.

AQCC Regulations


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General Permits Public Meetings

The Colorado Air Pollution Control Division is developing a facility-wide general permit for upstream oil and gas facilities in Colorado. Join us to learn more, ask questions, and share your thoughts on the drafting of the permit and the development of the Air Dispersion Modeling study used to support the permit.