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Tracking Washington's carbon pollution

Carbon pollution threatens people's health and welfare by leading to long-lasting changes in climate that can have a range of negative effects. We have several reporting programs designed to help us better understand where greenhouse gases (generally known as carbon pollution) are coming from and the amounts. These programs require state agencies and many businesses to regularly report their greenhouse gases.

Washington state's greenhouse gas inventory

We publish a report that summarizes greenhouse gases by sector and identifies trends. The inventory helps track the progress toward meeting the state’s greenhouse reduction limits. Visit the Washington state greenhouse inventory page to read the report.

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Washington's greenhouse gas reporting programs

Washington has several greenhouse gas reporting programs that help us track the state’s emissions. We require businesses who emit at least 10,000 metric tons of carbon pollution annually and all state agencies to report their greenhouse gas emissions.

In addition to the reporting programs, we publish an inventory of Washington's greenhouse gases every two years. These reports help us design policies to reduce greenhouse gas emissions and track progress toward meeting the state’s reduction limits.

Mandatory greenhouse gas reporting program

We've been collecting greenhouse gas emissions from companies since 2012. Our mandatory greenhouse gas reporting requirement applies to:

  • Facilities that annually pollute at least 10,000 metric tons of greenhouse gasses in Washington.
  • Suppliers of liquid motor vehicle fuel, special fuel, and aircraft fuel that supply products equivalent to at least 10,000 metric tons of carbon dioxide in Washington.

State agency greenhouse gas reporting program

The State Agency Climate Leadership Act established greenhouse gas (GHG) emission reduction limits for Washington state agencies. To track progress, some state agencies and higher education institutions are required to report their GHG emissions annually through the Washington state agency greenhouse gas reporting program. They're also required to report actions taken to reduce their emissions. Those required to report include:

  • State agencies with a baseline of 5,000 metric tons of CO2e or higher.
  • State universities and colleges with a baseline of 10,000 metric tons of CO2e or higher.