Subpart W - Petroleum and Natural Gas Systems

This page provides an overview of Subpart W reporting through e-GGRT. In certain instances, content on this page has been updated for Reporting Year (RY) 2019 and has been noted accordingly.

If you are starting out reporting for Subpart W, you must begin at the facility overview screen.  Add Subpart W to the list of subparts you will report and click on the "Open" link next to Subpart W. You will then see the following screen:

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Subpart W Reporting Form

An integrated reporting form that combines all of the Subpart W segments by source type as listed in 98.236 is available for download at Reporting Form Instructions.

You may also refer to Optional Calculation Spreadsheet Instructions to download the Subpart W calculation spreadsheet.

Subpart W includes ten industry segments with separate reporting requirements:

  • Onshore Petroleum and Natural Gas Production
  • Offshore Petroleum and Natural Gas Production
  • Onshore Petroleum and Natural Gas Gathering and Boosting
  • Onshore Natural Gas Processing
  • Onshore Natural Gas Transmission Compression
  • Onshore Natural Gas Transmission Pipelines
  • Underground Natural Gas Storage
  • Liquefied Natural Gas (LNG) Storage
  • LNG Import and Export Terminals
  • Natural Gas Distribution

Please prepare a separate version of the reporting form for EACH industry segment for which your facility must report. The Subpart W upload page as shown above will allow the user to upload multiple reporting forms. Only one reporting form may be uploaded for each industry segment; if you attempt to upload a reporting form representing an industry segment that has been previously uploaded the new file will over-write the previous file (see the February 2015 webinar  for information about source-specific reporting).

Sample populated reporting forms for each industry segment are available under “Example Files” at Subpart W XML Reporting Help.

The Subpart W RY19 reporting form includes the following worksheets:

Reporters should take note of the new items beginning in the RY17 reporting form described below:

There are multiple changes to the Equipment Leaks tab:

  • The applicability questions have been reworded for clarity and a new question has been added.
  • The leak survey characterization table (Table Q.1) now provides space to provide information about methods used to detect leaks. The table for reporting leak survey data (Table Q.2) now includes a place to report leaks from components in the Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting segments.
  • Finally, in the table for reporting emissions from components in the Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting segments using the population count methodology (Table R.1), the emission source type and the service type columns have been combined for clarity.

New tables have been added on the Associated Gas and Well Testing tabs to allow entry of data elements related to wildcat and delineation wells for which a 2-year reporting delay was claimed on the RY15 reporting form.

Please click this link for general guidance on how to enter data into the Subpart W reporting forms

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Completed Subpart W Reporting Forms

After you have successfully uploaded your reporting form, the upload page will be updated to reflect the file you have uploaded. During the upload e-GGRT will generate a validation report which will list potential deficiencies or issues with your reporting form. 

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If you attempt to upload a file but your file is not accepted by e-GGRT it is generally because your file has a critical error or is missing essential data - e-GGRT calls these critical errors screen errors. The reason why the file was not acceptable is displayed as a screen error message on the upload page. For an example of a screen error message, see above.

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Click on the "Subpart W: View Validation" link to review your validation report. An explanation of the validation report and the process for correcting validation issues prior to submission is presented in Reporting Form Validation

Once you have addressed the validation issues to the extent you believe necessary and address the requirements if any other applicable subparts you must generate, review, certify, and submit your annual report as described in How to Submit an Annual Report

Additional Resources:

This web site is maintained by a contractor to the U.S. Environmental Protection Agency (RY2023.R.01)