Emissions Inventories

Staff

If you have questions regarding these inventories, please contact:

Ben Way
Emissions Inventory Supervisor
307-777-7017
ben.way@wyo.gov

Tyler Ward
307-777-7872                             
tyler.ward@wyo.gov

Ryan Beavers
307-777-6126                           
ryan.beavers@wyo.gov

Actual Emissions Inventory

The Wyoming Department of Environmental Quality monitors and collects actual emissions data in accordance with federal regulations. Inventory data is uploaded to the appropriate database after all reporting facilities have submitted data to the AQD and that information has been reviewed. Emissions data may be updated when new information is received.

The AQD placed a Query Wizard into operation on July 1, 2014. This tool allows internal and external users to query the AQD’s two actual emissions databases. The WISE View database contains both Major and Minor point source actual emissions on a facility-by-facility, source-by-source, and pollutant-by-pollutant basis. The OGER database contains actual emissions associated with oil and gas production site operations on a well-by-well, source-by-source, and pollutant-by-pollutant basis.  

To access the Query Wizard, please click here.

The other files available below also contain actual emission data and are current as of the date posted. The most recent emissions data is made available by the Query Wizard described above. Please contact the AQD’s Emissions Inventory & Regional Haze Supervisor for inquiries regarding emissions data.

Annual and Winter UGRB Emissions

Actual emissions inventories and production information is required of both major and minor, oil and gas sources in the Upper Green River Basin (UGRB) in support of efforts to reduce elevated ozone levels in the area.  This information is collected on an annual basis. 

Annual emissions inventories for the previous year will be due no later than April 30th of the current year. 

Winter time emissions inventories (covering operations during February 1st – March 31st) will be due no later than June 30th of the current year.

Facilities with associated American Petroleum Institute (API) number (i.e. production sites, water injection wells, tank batteries, etc.) should be reported using one of three excel “Production Equipment Inventory” forms available below.  These forms are identical in nature except that they allow the user to report more or less facilities.

All other facilities (i.e. compressor stations, gas processing facilities, water injection facilities, etc.) should be reported using one of two “Compressor Station and Pipeline Emissions Inventory” forms available below.  These forms are identical in nature except that they allow the user to report more or less facilities.

The “Emission Factor Groups” Excel file available below can be used to determine which emission factor group oil and gas facilities belong to.  The AQD has developed 55 different field and formation specific emission factor groups.  Emission factors have been generated for roughly 18 of the 55 groups.  Within this Excel file is a pivot table designed to provide a list of wells by operator that are in each emission factor group.  Further instructions can be found on the “Instructions” tab of this Excel file.

Instructional .pdf files for completing and uploading emissions inventory forms can also be downloaded below. For questions concerning whether a fcaility is located within the UGRB designation area, please contact Tyler Ward at 307-777-7872 or tyler.ward@wyo.gov and provide a legal description (lat/long coordinates) of the location.

Please note that the Excel forms available below must be completed using Microsoft Excel 2007 or a newer version of this software.  Also, please be aware that the files below can exceed 5 MB in size!

Annual Sulfur Dioxide Inventory

Sources subject to the emissions trading program for SO2 under WAQSR Chapter 14, Section 3, for Regional Haze, are required to submit annual SO2 emission inventories.

Forms

Minor Source Emissions Inventories
In accordance with 40 CFR Part 51, Subpart A, states are required to report total state-wide emissions to the United States Environmental Protection Agency (EPA) every three years.  The Division requires each minor source in Wyoming to submit actual emission data for this effort.  Emissions data for a calendar year are due to the Division by April 30th of the following year.

Construction, mining, crushing & screening, and other non-oil & gas related minor sources should report using the “Annual Minor Source Inventory (Non Oil & Gas)” form for reporting actual emissions from minor sources can be accessed through the “Triennial Minor Source Emissions” link on the left.

UGRB Oil and Gas Emissions Inventories
Actual emissions inventories and production information is required of both major and minor, oil and gas sources in the Upper Green River Basin (UGRB) in support of efforts to reduce elevated ozone levels in the area.  This information is collected on an annual basis. 

Annual emissions inventories for the previous year will be due no later than April 30th of the current year. 

Winter time emissions inventories (covering operations during February 1st – March 31st) will be due no later than June 30th of the current year.

Oil and Gas Emissions Inventories
Facilities with associated American Petroleum Institute (API) number (i.e. production sites, water injection wells, tank batteries, etc.) should be reported using one of three excel “Production Equipment Inventory” forms available below.  These forms are identical in nature except that they allow the user to report more or less facilities.

All other facilities (i.e. compressor stations, gas processing facilities, water injection facilities, etc.) should be reported using one of two “Compressor Station and Pipeline Emissions Inventory” forms available below.  These forms are identical in nature except that they allow the user to report more or less facilities.

The “Emission Factor Groups” Excel file available below can be used to determine which emission factor group oil and gas facilities belong to.  The AQD has developed 55 different field and formation specific emission factor groups.  Emission factors have been generated for roughly 18 of the 55 groups.  Within this Excel file is a pivot table designed to provide a list of wells by operator that are in each emission factor group.  Further instructions can be found on the “Instructions” tab of this Excel file.

Instructional .pdf files for completing and uploading emissions inventory forms can also be downloaded below. For questions concerning whether a facility is located within the UGRB designation area, please contact Tyler Ward at 307-777-7872 or tyler.ward@wyo.gov and provide a legal description (lat/long coordinates) of the location.

Please note that the Excel forms available below must be completed using Microsoft Excel 2007 or a newer version of this software.  Also, please be aware that the files below can exceed 5 MB in size!

Major Title V Emissions Inventories

The Wyoming Department of Environmental Quality (DEQ), Air Quality Division (AQD), collects and manages data on air pollution emissions throughout the state.  There are several different emission inventory efforts.  

Minor Source Emissions Inventories

In accordance with 40 CFR Part 51, Subpart A, states are required to report total state-wide emissions to the United States Environmental Protection Agency (EPA) every three years.  The Division requires each minor source in Wyoming to submit actual emission data for this effort.  Emissions data for a calendar year are due to the Division by April 30th of the following year.

Construction, mining, crushing & screening, and other non-oil & gas related minor sources should report using the “Annual Minor Source Inventory (Non Oil & Gas)” form for reporting actual emissions from minor sources can be accessed through the “Triennial Minor Source Emissions” link on the left.

UGRB Oil and Gas Emissions Inventories

Actual emissions inventories and production information is required of both major and minor, oil and gas sources in the Upper Green River Basin (UGRB) in support of efforts to reduce elevated ozone levels in the area.  This information is collected on an annual basis. 

Annual emissions inventories for the previous year will be due no later than April 30th of the current year. 

Winter time emissions inventories (covering operations during February 1st – March 31st) will be due no later than June 30th of the current year.

Oil and Gas Emissions Inventories

Facilities with associated American Petroleum Institute (API) number (i.e. production sites, water injection wells, tank batteries, etc.) should be reported using one of three excel “Production Equipment Inventory” forms available below.  These forms are identical in nature except that they allow the user to report more or less facilities.

All other facilities (i.e. compressor stations, gas processing facilities, water injection facilities, etc.) should be reported using one of two “Compressor Station and Pipeline Emissions Inventory” forms available below.  These forms are identical in nature except that they allow the user to report more or less facilities.

The “Emission Factor Groups” Excel file available below can be used to determine which emission factor group oil and gas facilities belong to.  The AQD has developed 55 different field and formation specific emission factor groups.  Emission factors have been generated for roughly 18 of the 55 groups.  Within this Excel file is a pivot table designed to provide a list of wells by operator that are in each emission factor group.  Further instructions can be found on the “Instructions” tab of this Excel file.

Instructional .pdf files for completing and uploading emissions inventory forms can also be downloaded below. For questions concerning whether a facility is located within the UGRB designation area, please contact Tyler Ward at 307-777-7872 or tyler.ward@wyo.gov and provide a legal description (lat/long coordinates) of the location.

Please note that the Excel forms available below must be completed using Microsoft Excel 2007 or a newer version of this software.  Also, please be aware that the files below can exceed 5 MB in size!

Triennial Minor Source Emissions

In accordance with 40 CFR Part 51, Subpart A, states are required to report total state-wide emissions to the United States Environmental Protection Agency (EPA) every three years. The Division requires each minor source in Wyoming to submit estimated actual emissions data for this effort. Emissions data for calendar year 2020 are due to the Division by April 30, 2021.

How to Submit Minor-Source Emissions inventories. All operators should be using the Division’s IMPACT data management system to manage their facility inventories and report emissions inventories via the web portal. Exceptions: There are certain cases – i.e., oil and gas production-site operators with a large number of facilities – for which the Division has developed new, external Excel workbooks designed to capture, process and upload data into IMPACT for multiple facilities in batch mode. (See below in Oil and Gas Production Facilities for more information.)

Oil and Gas Production Facilities. Facilities with an associated American Petroleum Institute (API) number (i.e., production sites, injection wells, tank batteries, etc.) have two options for developing/ submitting 2020 emissions inventories:

  1. Work directly in IMPACT via the web portal to develop the EI for each facility. This is probably the best option for operators that have a relatively small number of facilities to report (~ 25 or fewer). Or…
  2. Follow the new batch submittal reporting procedure outlined in the “New Production-Site Batch EI Submission Process Overview_2020 Annual EI" document available below for download. The Excel tools described in this Overview help mitigate IMPACT’s constraint that limits users to working on one facility at a time.

IMPORTANT: (a) Before you can develop an EI in IMPACT or submit batch EI data for upload, operators must first develop complete facility inventories in IMPACT. (b) IMPACT will not auto-calculate estimated emissions for dehys, tanks or truck loading emission units. Operators can calculate emissions for these unit types using an approved method and enter those results into IMPACT, or the Division can assist by running the associated parameters through ProMax to generate estimated emissions, as part of the batch data handling outlined in the above-mentioned Overview.

Although the legacy “Production Equipment – Emissions Inventory” Excel forms are still posted here for downloading, please do not use them for the 2020 EI without first contacting the Emissions Inventory Section staff.

Oil and Gas Midstream Facilities.  The Division requests that Operators develop emissions inventories for compressor stations, gas processing facilities, water injection facilities, etc. in the IMPACT system. If you are unable to use IMPACT, report your emissions using one of the two “Compressor Station and Pipeline Emissions Inventory” forms available below.  NOTE: These two forms are identical in function, they are simply configured to allow operators to report a smaller or larger number of facilities.

Emission Factor Groups. The “Emission Factor Groups” Excel file available below can be used to determine which emission factor group oil and gas facilities belong to. The AQD has developed 55 different field- and formation-specific emission factor groups. Emission factors have been generated for roughly 18 of the 55 groups. Within this Excel file is a pivot table designed to provide a list of wells by operator that are in each emission factor group. Further instructions can be found on the “Instructions” tab of this Excel file.

Non-Oil & Gas Minor Sources. The Division requests that operators of construction, mining, crushing & screening, and other non-oil & gas related minor sources develop their emissions inventories directly in IMPACT via the web portal. If you are unable to use IMPACT, you may report emissions using the form “Emissions Inventory Form_Minor Sources Non-Oil & Gas_Annual 2020” available below.

General Information

  • Instructional .pdf files for completing and uploading emissions inventory forms can also be downloaded below.
  • Please note that if using the Excel forms available below, the version of Microsoft Excel must be 2007 or newer.  

The Wyoming Department of Environmental Quality monitors and collects actual emissions data in accordance with federal regulations. After review, this data is uploaded to the appropriate database. Emissions data may be updated when new information is received. Actual emissions data is made available by the Query Wizard.

All documents made available by the Emissions Inventory section of the DEQ-Air Quality Division are current as of the date posted. Please be aware that these documents are updated as needed by the DEQ-AQD and can exceed 5 MB in size. 

State-wide minor source emissions inventories are collected every three years in accordance with 40 CFR Part 51, Subpart A, except as explained below for sites in the Upper Green River Basin (UGRB). Forms, Excel spreadsheets and other information for reporting actual emissions from minor sources can be accessed through the “Triennial Minor Source Emissions” tab at the top.

Most Wyoming oil and gas facilities, including production sites, are considered minor emission sources, with inventories typically collected every three years. However, emissions inventories for oil and gas facilities operating in the UGRB are collected each year for two different reporting periods: the Annual emissions inventory covers the entire calendar year, and the Winter emissions inventory covers the period of February 1 through March 31.

Forms, Excel spreadsheets and other information for reporting actual emissions from minor source oil and gas facilities in the UGRB can be accessed through the “Annual and Winter UGRB Emissions” tab at the top.  

The AQD has developed emissions factor groups to assist operators in reporting actual emissions from minor source oil and gas facilities. A link to an Excel pivot table with instructions for determining the emission factor group of an oil and gas facility is available under the “Forms” tab at the top. 

For information on oil and gas production, including MCF of gas or BBLs of oil and produced water, visit the Wyoming Oil & Gas Conservation Commission website.