Research & Data

Use this portal to filter and search for all of our scientific information.

Ecology provides the high-quality science that is the foundation of Washington state environmental policy. Our monitoring, assessment, and modeling services provide a data-rich understanding of our state’s land, air, and water. We provide access to that data through reports, databases, maps and user-friendly online tools.

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Washington Climate Commitment Act: Summary of economic and market modeling and analysis of the proposed cap and invest program

This is the foreword to the draft report of the summary of market modeling and analysis of the proposed cap and invest program of the Climate Commitment Act.

https://ecology.wa.gov/202207ccaeconforewd

Washington Climate Commitment Act: Summary of market modeling and analysis of the proposed Cap and Invest Program, June 2022

This is the draft report of the summary of market modeling and analysis of the proposed cap and invest program of the Climate Commitment Act.

https://ecology.wa.gov/202206ccaeconmodel

Greenhouse Gas Assessment for Projects (GAP) Rulemaking June 2020 Presentation

Public webinar presentation given 6-25-20

https://ecology.wa.gov/6-25-20-presentation

Greenhouse Gas Assessment for Projects (GAP) Rulemaking June 2020 Meeting Summary

Meeting summary for 6-25-20 public rulemaking webinar

https://ecology.wa.gov/6-25-20-meeting-summary

Greenhouse Gas Assessment for Projects (GAP) Rulemaking July 2020 Presentation

Public webinar presentation given 7-23-20

https://ecology.wa.gov/7-23-20-presentation

Greenhouse Gas Assessment for Projects (GAP) Rulemaking July 2020 Meeting Summary

Meeting summary for 7-23-20 public rulemaking webinar

https://ecology.wa.gov/7-23-20-meeting-summary

Greenhouse Gas Assessment for Projects (GAP) Rulemaking August 2020 Presentation

Public webinar presentation given 8-27-20

https://ecology.wa.gov/8-27-20-presentation

Greenhouse Gas Assessment for Projects (GAP) Rulemaking August 2020 Meeting Summary

Meeting summary for 8-27-20 public rulemaking webinar

https://ecology.wa.gov/8-27-20-meeting-summary

Adopted emergency rule language (WAC 173-446) 9-7-23

This is the second emergency adopted rule language for WAC 173-446, Climate Commitment Act Program Rule.

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-446-9-7-23

Director's Preliminary Linkage Decision

The Director of Ecology made a preliminary decision to pursue linking Washington's carbon market with California and Québec.

https://ecology.wa.gov/20231002directorlinkagedecision

Cap-and-Invest Agency Request Legislation

Summary of the the proposed agency request legislation for the Cap-and-Invest Bill

https://ecology.wa.gov/20231108capinvestagencyrequest

Adopted emergency rule language (WAC 173-446) 1-4-24

This is the third emergency adopted rule language for WAC 173-446, Climate Commitment Act Program Rule.

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-446-1-4-24

Cap-and-Invest Key Market Events Timeline 2024

Static .pdf timeline of key cap-and-invest market events for 2024. Companion to the interactive timeline on the Auctions and Market webpage.

https://ecology.wa.gov/20240110capandinvestkeymarketeventstimeline2024

Adopted rule language (WAC 173-446) 2-21-24

This is adopted rule language for WAC 173-446, Climate Commitment Act Program Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-446-2-21-24

State Agency Reporting Instructions

.pdf instructions for State Agencies reporting GHG emissions using the State Agency GHG Reporting tool

https://ecology.wa.gov/2024stateagencyreportinginstruction-ghgreporting

State Agency Greenhouse Gas Emissions Calculator

Excel sheet used to determine state agencies annual greenhouse gas emissions

https://ecology.wa.gov/2024stateagencyghgemissionscalculator-ghgreportingtool

Adopted rule language (WAC 173-441)

Adopted rule language WAC 173-441

https://ecology.wa.gov/adopted-rule-language-wac-173-441-12-03-24

Adopted rule language (WAC 173-446)

Adopted rule language WAC 173-446

https://ecology.wa.gov/adopted-rule-language-wac-173-446-12-03-24

Fuel Exemptions Workgroup Meeting Agendas and Summaries

Agendas and summaries from the fuel exemption workgroup meeting

https://ecology.wa.gov/fuel_exemptions_workgroup

Public comments on Cap-and-Invest linkage (Jan. 31-May 15, 2023)

Document with all comments received about linkage from Jan. 31 to May 15, 2023

https://ecology.wa.gov/linkage_comments_spring2023