Transportation fuel suppliers are required to report their greenhouse gas emissions to us based on the information they already submit to the Washington Department of Licensing. Businesses that must report are those with active fuel tax licenses that supply enough applicable fuels to meet or exceed 10,000 metric tons of carbon dioxide emissions per year.
Petroleum product producers and importers have separate reporting requirements. If your business is both a transportation fuel supplier and a petroleum product producer or importer, you need to report using both the method on this page and the method on the greenhouse gas reporting page.
Applicable fuels
The following fuels need to be reported.
- All taxable gallons of motor vehicle fuel, including:
- All taxable gallons of special fuel, including:
- Diesel
- Biodiesel
- Propane
- Nature gas
- Kerosene
- Any other combustible liquid or gas used to power a motor vehicle, except fuel that is subject to the tax imposed by Chapter 82.36 RCW.
- Some aviation gasoline and jet fuel. (See transportation fuel supplier calculator for details.)
Reporting threshold
The reporting threshold is 10,000 metric tons of carbon dioxide emissions. Reporting requirements are based on the amount of annual carbon dioxide released from the complete combustion or oxidation of your fuels, not by the number of gallons you supply. However, you can use the table below to estimate if you are close to the reporting threshold, based on the gallons you supply. Any of the values below individually or in combination should be enough to require reporting. You need to use the transportation fuel supplier calculator to officially determine your emissions.
| Fuel type |
Approximate fuel sold annually in Washington to meet 10,000 metric tons of carbon dioxide emissions (gallons per year) |
| Gasoline |
1,100,000 |
| Ethanol |
1,700,000 |
| Diesel |
970,000 |
| Biodiesel |
1,000,000 |
| Jet fuel |
1,000,000 |
| Aviation gasoline |
1,200,000 |
Steps for transportation fuel suppliers
Follow these steps to report your greenhouse gas emissions. Reports are due by Oct. 31.
You're responsible for reporting greenhouse gas emissions associated with the fuels you supply in Washington if you have an active fuel tax license and supply enough applicable fuels to meet or exceed 10,000 metric tons of carbon dioxide emissions per year. You can determine your annual emissions using the transportation fuel supplier emission calculator. A list of organizations with active fuel tax licenses is available on the Department of Licensing website.
Complete the certificate of representation registration form and submit it to us. This form allows you to identify your designated and alternate designated representative. The representatives have permission to report for your organization. You may email the form to ghgreporting@ecy.wa.gov or mail it to the address on the form.
Use the transportation fuel supplier calculator to determine your annual greenhouse gas emissions produced from applicable fuels.
Transportation fuel supplier greenhouse gas emissions data
GHG reporting data can be viewed, filtered, and downloaded on our data.wa.gov site. This table contains information from all reports (including facilities) for each year since reporting began in 2012.