Mandatory greenhouse gas reporting for large emitters
Washington requires industrial facilities, electric power entities and fuel suppliers that emit at least 10,000 metric tons of greenhouse gases each year to report their emissions to Ecology. This information is used to better understand Washington’s emissions and run the Cap-and-Invest Program.
More about this dataset
Ecology has collected greenhouse gas emissions data from industrial facilities since 2012. In 2022, this dataset was expanded to include all of the state’s largest emitters in anticipation of the state’s major climate policies taking effect. Natural gas suppliers also back reported to 2015.
This dataset accounts for the majority of Washington’s emissions and is available on data.wa.gov where it can viewed, filtered, and downloaded.
You can also view the dataset using the graphs below.
What does the data tell us?
This data accounts for the majority of Washington’s emissions, it’s a valuable indicator of the state’s total emissions for those years, which will be calculated through the greenhouse gas inventory.
View the chart in full screen.
The graph above shows ‘reported emissions,’ which includes all emissions reported to Ecology by large emitters, and a subset of that total called ‘covered emissions,’ which is subject to the Cap-and-Invest Program. Over time, covered emissions data will be used to assess the effectiveness of the Cap-and-Invest Program.
Who is required to report in Washington?
Ecology collects emissions data from all large emitters in Washington, including:
- Facilities that emit 10,000 metric tons of carbon dioxide equivalent (MT CO2e) or more annually.
- Natural gas or other fuel suppliers that produce, import, or deliver products equivalent to 10,000 MT CO2e or more annually.
- Electric power entities (EPEs) that import or deliver electricity equivalent to 10,000 MT CO2e or more annually.
In certain instances, emitters that reduce their emissions levels under these reporting thresholds may still be required to report emissions data until certain conditions are met.
The graphic below represents the proportion of the total emissions reported to Ecology by each type of reporter.
The graphic above represents the proportion of the total emissions reported to Ecology by each type of reporter.
Reporting your greenhouse gas emissions
The information below will help you report your emissions to Ecology for the required greenhouse gas reporting program.
Some facilities that are required to report their emissions to Ecology are also required to report to the EPA. Please visit their website for more information about the EPA greenhouse gas reporting program.
Steps to register and report your emissions
| Types of reporters | Reporting deadlines |
| Facilities, natural gas and other fuel suppliers, and other reporters | March 31st following the emissions year |
| Electric power entities | June 1st following the emissions year |
There is an annual reporting fee. The fee is based on our cost to administer the program and the number of businesses reporting that year. View the fee schedule for 2025 reporting.
| Type of reporters | Fee for 2025 reports |
|---|---|
| Reporters required to, or voluntarily, report to Ecology and subject to third-party verification |
$2,413 |
| Reporters required to, or voluntarily, report to Ecology and not subject to third-party verification |
$456 |