Overview
Oil and gas operators must submit annual emissions inventory reports to the Oil and Natural Gas Annual Emission Inventory Reporting (ONGAEIR) web-based portal by June 30 each year. The reports are required under Air Quality Control Commission Regulation 7, Part B, Sections IV and V. This webpage offers guidance and other resources to help complete annual reports.
The 2024 ONGAEIR submissions are due June 30, 2025 and will be available January 2025. Updated guidance documents for report development, submission, and equipment/activity specific calculation methods are now available.
Reporting and submission guidance
The Air Quality Control Commission requires reporting for oil and gas emissions under Regulation No. 7, Part D, Section V. Reference the guidance for ONGAEIR report development for instructions on completing the data entry workbooks for the annual emissions reporting. Reference the guidance for submitting ONGAEIR reports for submission instructions. Access the web portal to submit annual emissions inventory reports, supporting documentation, and Section IV certifications. A registered user account is required before submitting the form.
Calculation methodology and reporting forms
Reference the calculation methodology and emission factors guidance for the regulated activities and equipment which correspond to the workbook tabs for each of the data entry sheets. The 2024 Version 7.0 workbooks and data entry instructions for each reporting workbook type are included below.
- Amine Units.
- Combustion Control Devices.
- Dehydration Units.
- Drilling mud and mud pits.
- Fugitives.
- Loadout.
- Pipeline leaks (previously pipeline venting).
- Pneumatics.
- Process heaters or boilers.
- Separators.
- Stationary (non-road) engines or turbines.
- Tanks.
- Venting, blowdowns, and routine or predictable emissions (ROPE).
- Well maintenance.
The operations workbooks will be available by February 2025.
The 2023 operator submissions data is provisional and subject to revision and validation by division staff. Operators provide the emissions data, which may be resubmitted by operators at any time. For the most recent data or if a reporting error is observed, contact the division at cdphe_apcd_ei@state.co.us.
- 2023 pre-production operations - version 6.1.
- 2023 production operations - version 6.1.
- 2023 midstream and pipeline operations - version 6.1.1.
- 2023 Underground Injection (UIC) operations - version 6.1.
The 2022 operator submissions data is provisional and subject to revision and validation by division staff. Operators provide the emissions data, which may be resubmitted by operators at any time. Contact the division at cdphe_apcd_ei@state.co.us for the most recent data, if a reporting error is observed, or to obtain blank templates for 2022 and prior.
Contact us
Questions? Email cdphe_apcd_ei@state.co.us.
For questions about the toxic air contaminant (TAC) reporting tab, visit the Guidance for facilities required to submit annual air toxics reports under HB22-1244.
Stay informed. Subscribe to receive email updates from the division. Sign up for the Oil and Gas Air Emissions Regulatory Information mailing list for ONGAEIR related regulatory updates and announcements.