Event detail icon
Comment Period

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

Proposed rulemaking

Oct. 6, 2021 - Nov. 16, 2021, 11:59 p.m.

Ecology proposes to update Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.

This rulemaking:

  • 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 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.

Documents for review


We write rules to implement and enforce state and federal environmental laws and rules.  Ecology follows a 3-phase process for rulemaking:

  1. Announcement and development
  2. Proposal
  3. Adoption

For each phase of the process, we update the rulemaking web page and notify interested parties. We also file notice in the Washington State Register. To learn more about Ecology’s rulemaking process, read the Frequently Asked Questions.

Comment online icon

Comment online

Comment by mail icon

Comment by mail

Rachel Assink
Washington Department of Ecology
Air Quality Program
P.O. Box 47600
Olympia, WA 98504-7600
Related event icon

Attend a related event

Questions icon


Rachel Assink
Rulemaking Lead

To request ADA accommodation, contact Ecology's ADA Coordinator by email at ecyadacoordinator@ecy.wa.gov, or call 360-407-6831, 711 (relay service), or 877-833-6341 (TTY). More about our accessibility services.