Greenhouse gas regulations

The Legislature has given us the responsibility to track the state's greenhouse gas emissions, to measure the progress state agencies are making to reduce their greenhouse gas emissions, and to make recommendations on whether the state needs to set more stringent targets for emission reductions.

Clean Air Rule

In March 2018, Thurston County Superior Court ruled that parts of the Clean Air Rule are invalid. The Superior Court's ruling prevents us from implementing the Clean Air Rule regulations that cap and gradually reduce major sources of carbon pollution. This means that compliance with the rule currently is suspended. On May 14, 2018 we filed an appeal with the Washington State Supreme Court.

Under a separate Ecology rule, facilities covered by the Clean Air Rule still are required to report their emissions for the Greenhouse Gas Reporting program.

Clean Power Plan

The U.S. Environmental Protection Agency set the first-ever greenhouse gas limits for the nation's existing power plants in August 2015. States must develop and submit a plan showing how they will implement the federal rule. Ecology is responsible for developing Washington's Clean Power Plan.

Greenhouse gas emissions standard and sequestration

Certain power plants in Washington are required to meet greenhouse gas emission standards, and offset or mitigate their carbon pollution. Learn more about this regulation on the greenhouse gas emission standard and sequestration page.

Petroleum refinery greenhouse gas emission requirements

Oil refineries were required to reduce their greenhouse gas emissions 10 percent by 2015. If they were not able to reduce their emissions, they are required to maintain an above-average energy efficiency rating. Read more on the petroleum refinery greenhouse gas emission requirements page.

Required greenhouse gas reporting programs

We require facilities that emit at least 10,000 metric tons of carbon pollution annually to report their greenhouse gas emissions. We also require state agencies with a baseline of 5,000 metric tons, and universities or colleges with a baseline of 10,000 metric tons, to report their emissions.
Facilities 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 reporting program

Industry regulations

Clean Air Rule Clean Power Plan Greenhouse gas emission standard and sequestration Petroleum refinery greenhouse gas emission requirements