Chapter 173-446 WAC – Cap-and-Invest Offsets

We propose to update Chapter 173-446 WAC, Climate Commitment Act Program Rule. This rulemaking may consider amendments to address new and revised cap-and-invest offset protocols. Offsets are projects or programs designed to reduce the amount of greenhouse gases (GHGs) in the atmosphere. In the cap-and-invest program, offset projects must also provide direct environmental benefits to Washington. Offsets allow businesses to balance out the negative impacts of their emissions by funding a project that benefits the environment such as capturing methane on dairy farms or planting trees in urban areas.

The scope of this rulemaking may consider adding or updating protocols to increase the potential variety of offset projects that can be developed within the cap-and-invest program, as directed by RCW 70A.65.170(4)(b). This statute directs Ecology to conduct rulemaking that makes sure that any updates or additions to the offset program are both based in the best available science, and support the needs of landowners and communities in Washington.

Rulemaking timeline


Announcement phase (CR-101)

Filing date:
Sept. 12, 2023

Announcement documents

Rule development phase

September 12, 2023 – Fall 2024

Public input & involvement

We plan to hold public meetings to provide information about the rulemaking and seek your input.  We will update this page with meeting specifics. To get updates about these meetings and this rulemaking, join our email list.

Public comment period (informal)
Nov. 9, 2023 – June 30, 2024

Comment online about which offset protocols should be revised or added and about the scope and process of this rulemaking.

Ecology's public meetings

Date Documents Location
Nov. 14, 2023
1 PM – 3 PM

webinar recording 1

April 23, 2024
8 AM - 10 AM
Presentation Virtual  

Friday May 17, 2024

8AM - 10AM

  Zoom registration

Tuesday, June 4, 2024


  Zoom registration coming soon. 
Tuesday, June 25, 8am-10am   Zoom registration coming soon

 Webinar information:
   Register for each webinar to get your meeting ID and passcode.
   To hear the webinar better or to call in only, use your phone (instead of the computer) to call 253‑215‑8782.

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.