Subpart W - Petroleum and Natural Gas Systems
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This page provides an overview of Subpart W reporting through e-GGRT. More detailed information regarding Subpart W reporting can be found in the Subpart W Webinar.  

If you are starting out reporting for Subpart W you must start at the facility overview screen.  Once you have added Subpart W to the list of subparts you will report and clicked on the "Open" link next to Subpart W you will 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 eight industry segments with separate reporting requirements:

  • Offshore Petroleum and Natural Gas Production
  • Onshore Petroleum and Natural Gas Production
  • Onshore Natural Gas Processing
  • Onshore Natural Gas Transmission Compression
  • 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 a 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):

  • Subpart W Introduction
  • Facility Overview
  • Natural Gas Pneumatic Devices
  • Natural Gas Driven Pneumatic Pumps
  • Acid Gas Removal Units
  • Dehydrators
  • Well Venting for Liquids Unloading
  • Gas Well Completions and Workovers
  • Blowdown Vent Stacks
  • Production Storage Tanks 
  • Transmission Storage Tanks
  • Well Testing
  • Associated Gas Venting and Flaring
  • Flare Stacks
  • Centrifugal Compressors
  • Reciprocating Compressors
  • Equipment Leaks Surveys and Population Counts
  • Offshore Petroleum and Natural Gas Production
  • Enhanced Oil Recovery Injection Pump Blowdown
  • Enhanced Oil Recovery Hydrocarbon Liquids 
  • Combustion Equipment at Onshore Petroleum and Natural Gas Production and Natural Gas Distribution /Facilities 

BAMM requirements, including the eligible emission sources, have changed for Reporting Year 2015. Certain eligible Reporters were able to use BAMM from January 1, 2015 to March 31, 2015 for the 2015 reporting year without prior approval from the EPA. In order to use BAMM beyond March 31, 2015,  a formal BAMM request must have been submitted to the EPA by January 31, 2015  and subsequently approved by the EPA. For more information click Subpart W BAMM Help.

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 below.

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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 (RY2015.R.03)