Oil and Natural Gas Annual Emission Inventory Reporting
Updates:
- 2025 reporting templates and data entry instructions are now available.
- The ONGAEIR interactive dashboard system provides the most up-to-date and publicly available data for the reporting workbooks submitted to the ONGAEIR database.
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 2025 ONGAEIR submissions are due June 30, 2026. The templates are available below. Updated guidance documents for report development, submission, and equipment/activity specific calculation methods are now available for all reporting years.
ONGAEIR interactive dashboard system
The new ONGAEIR dashboard system provides the most up-to-date and publicly available data for the reporting workbooks submitted to the ONGAEIR database. The system includes information on emissions amounts and trends from oil and gas facilities. To learn how the data is received, updated, and used, view the ONGAEIR frequently asked questions. For information on navigating the interactive dashboard system, read the instructions.
ONGAEIR data is provisional and subject to validation by division staff. Operators may revise and resubmit data (or may be required to do so) to correct reporting errors. Contact us for any additional information or questions regarding the ONGAEIR record or query of the data contained.
Reporting and submission guidance
The Air Quality Control Commission requires reporting for oil and gas emissions under Regulation 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 2025 Version 8.0 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.
- Flowback or completions.
- Fugitives.
- Loadout.
- Pipeline leaks (previously pipeline venting).
- Pneumatics.
- Process heaters or boilers.
- Separators.
- Stationary engines or turbines, and non-road engines.
- Tanks.
- Venting, blowdowns, bradenhead, and routine or predictable emissions (ROPE).
- Well maintenance.
- 2025 pre-production operations - version 8.0.
- 2025 production operations - version 8.0.
- 2025 midstream and pipeline operations - version 8.0.
- 2025 Underground Injection (UIC) operations - version 8.0.
For the production and pre-production 2025 ONGAEIR workbooks due June 30, 2026 subject to the oil and gas greenhouse gas intensity program, the division will apply the state default factor to the reported and validated methane emissions after submission for operators that are not implementing an operator-specific program. Operators implementing an operator-specific program will report their emissions as directed by the division and in accordance with the results of their program.
Upcoming information session
The division is hosting an online information session on Feb. 11 at 11 a.m. for oil and gas owners and operators. Join to learn about regulatory changes from the previous year and ask questions. The meeting will focus primarily on the changes from 2024 to 2025 ONGAEIR reporting and guidance.
Contact us
Questions? Email cdphe_apcd_ei@state.co.us.
If a reporting error is observed, for data entry assistance, or to obtain blank templates for reporting years 2023 and prior, 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 web page.
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