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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Inslee statement on Clean Air Rule decision

Statement by Gov. Jay Inslee on 1-16-20 related to the Supreme Court ruling on the Clean Air Rule.

https://ecology.wa.gov/inslee-statement-on-clean-air-rule-decision

Expedited Rulemaking Proposal (WAC 173-442) 03-22-23

This is an expedited rulemaking proposal (CR-105 form) for Chapter 173-442, Clean Air Rule.

https://ecology.wa.gov/expedited-rulemaking-proposal-wac-173-442-01-23-23

Draft rule language (WAC 173-446A) 09/21/21

This is the draft rule language for Chapter 173-446A WAC, Criteria for Emissions-Intensive, Trade-Exposed Industries.

https://ecology.wa.gov/draft-rule-language-wac-173-446a-09-21-21

Draft rule language (WAC 173-446) 01/04/22

This is the draft rule language for Chapter 173-446 WAC, Climate Commitment Act Program. (1/4/22 version)

https://ecology.wa.gov/draft-rule-language-wac-173-446-01-11-22

Draft rule language (WAC 173-446) 12/09/21

This is the draft rule language for Chapter 173-446 WAC, Climate Commitment Act Program. (12/9/21 version)

https://ecology.wa.gov/draft-rule-language-wac-173-446-12-09-21

Draft rule language (WAC 173-446) 11/08/21

This is the draft rule language for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/draft-rule-language-wac-173-446-11-08-21

Implementation dates (WAC 173-446) 9-29-22

This is the September 29, 2022 implementation timeline for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/implementation-dates-wac-173-446-9-29-22

Draft timeline (WAC 173-446) 6-8-22

This is a draft implementation timeline for Chapter 173-446 WAC, Climate Commitment Act Program. (6/8/22 version)

https://ecology.wa.gov/draft-timeline-wac-173-446-6-8-22

Draft timeline (WAC 173-446) 01/24/22

This is a draft implementation timeline for Chapter 173-446 WAC, Climate Commitment Act Program. (1/24/22 version)

https://ecology.wa.gov/draft-timeline-wac-173-446-01-24-22

Presentation (WAC 173-446) 1/11/22

This is the presentation for the 1/11/22 stakeholder meeting for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/presentation-wac-173-446-1-11-22

Presentation (WAC 173-446) 12/16/21PM

This is a presentation for the 12/16/21 (PM) stakeholder meeting for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/presentation-wac-173-446-12-16-21pm

Presentation (WAC 173-446) 12/16/21AM

This is a presentation for the 12/16/21 (AM) stakeholder meeting for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/presentation-wac-173-446-12-16-21

Draft rule language (WAC 173-443) 9-14-22

This is the September 14, 2022 draft rule language for Chapter 173-443 WAC, Hydrofluorocarbons.

https://ecology.wa.gov/draft-rule-language-wac-173-443-9-14-22

Draft rule language (WAC 173-443) 7-6-22

This is the July 6, 2022 draft rule language for Chapter 173-443 WAC, Hydrofluorocarbons.

https://ecology.wa.gov/draft-rule-language-wac-173-443-7-6-22

Presentation (WAC 173-446) 11/08/21

This is a presentation for the 11/8/21 stakeholder meeting for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/presentation-wac-173-446-11-08-21

Presentation (WAC 173-446) 6-21-22

This is the presentation for the June 21, 22, 27, 28, 2022 public hearings for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/presentation-wac-173-446-6-21-22

Presentation (WAC 173-424) 08-23-22

This is a presentation for the 8/23/22 public hearing for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/presentation-wac-173-424-08-23-22

Presentation (WAC 173-441) 9-28-23

These are the presentation slides from the 9/28/23 meeting with the Southwest Power Pool for the Electricity Markets rulemaking.

https://ecology.wa.gov/presentation-wac-173-441-9-28-23

Draft rule language (tracked) (173-424)

Summary of proposed changes to WAC 173-424

https://ecology.wa.gov/draft-rule-language-tracked-173-424

Draft rule language (WAC 173-424) 11-26-24

“November 2024 CFS Draft Rule Language” contains the full draft rule language text

https://ecology.wa.gov/draft-rule-language-wac-173-424-11-26-24