Chapter 173-441 WAC – Reporting of Emissions of Greenhouse Gases

On February 9, 2022, Ecology updated Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases, as directed by Section 33 of the Climate Commitment Act.

This rule:

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

In May 2021, the governor signed the Climate Commitment Act which established a cap-and-invest program to help Washington meet 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 – October 5, 2021

Public input & involvement

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

Read comments 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

1 Webinar information:
   Register for each webinar to get your access code and password.
   To hear the webinar better or to call in only, use your phone (instead of the computer) to call 1-855-929-3239.

Rule proposal phase (CR-102)

Filing date:
Oct. 6, 2021

Rule proposal documents:

Comment period

Comments were due by November 16, 2021. We accepted comments in the following ways:

  • Read comments.

  • Attend a public hearing online (webinar):
    November 9, 2021 at 10 a.m.
  • Mail to:  Rachel Assink
       Department of Ecology
       Air Quality Program
       P.O. Box 47600
       Olympia, WA  98504-7600

Public hearing

Date/Time:  November 9, 2021 at 10 a.m. online webinar

Location:  online (webinar)
    Register for each webinar to get your access code and password.
    To hear the webinar better or to call in only, use your phone (instead of the computer) to call 1-855-929-3239.

Agenda: Presentation, question-and-answer session, followed by public hearing

Accessibility:  To request ADA accommodation for the public hearing, email Ecology’s ADA coordinator by November 2, 2021.  Or call (360) 407-6831, 711 (relay service), or 877-833-6341 (TTY).

Additional languages

Español (Spanish) 中文 (Chinese) Tiếng Việt (Vietnamese) 한국어 (Korean)


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.