Chapter 173-441 WAC

Ecology plans to update Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases, as directed by Section 33 of the Climate Commitment Act.

This rulemaking may:

  • Add natural gas suppliers, carbon dioxide suppliers, and electric power entities to the existing greenhouse gas reporting program.
  • Replace the transportation fuel supplier program with a program that is compatible with the Climate Commitment Act.
  • Update greenhouse gas reporting requirements to support the Climate Commitment Act and facilitate program linkage with other jurisdictions.
  • Add program elements to support the verification of greenhouse gas reporting data.
  • Modify administrative provisions, such as deadlines and greenhouse gas reporting fees.
  • Include requirements necessary to support the above items, the overall objectives of the statute or chapter, or the goals of the Climate Commitment Act. 
  • Make administrative changes for correction or clarification.

In 2021, the governor signed the Climate Commitment Act which established a cap-and-invest program to achieve Washington's greenhouse gas limits by 2050. About 75 percent of greenhouse gas emissions included in the new cap-and-invest program are not reported or are reported using methods that conflict with the Climate Commitment Act. Ecology will create a reporting system that complies with the Climate Commitment Act.

Rulemaking timeline


Announcement phase (CR-101)

Filing date:
July 7, 2021

Announcement documents

Rule development phase

July 7, 2021 – Fall 2021

Public input & involvement

Public comment period (informal)
July 15, 2021 – August 1, 2021

Comment on the draft rule.

Ecology's meeting with stakeholders

Date Documents Location
July 22, 2021
10 a.m. – 4 p.m.
Draft rule language
webinar 1

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Additional languages

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To request ADA accommodation for disabilities, or printed materials in a format for the visually impaired, contact Ecology's ADA Coordinator by email at, or call 360-407-6831. People with impaired hearing may call Washington Relay Service at 711. People with speech disability may call TTY at 877-833-6341.