Research & Data

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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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Rulemaking Announcement (WAC 173-445) 04/30/20

This is a rulemaking announcement (CR-101) for WAC 173-445, Greenhouse Gas Assessment for Projects.

https://ecology.wa.gov/rulemaking-announcement-wac-173-445-04-30-20

Rulemaking Announcement (WAC 173-446B) 5-25-23

This is a rulemaking announcement (CR-101) for WAC 173-446B, Climate Commitment Act Funds Reporting.

https://ecology.wa.gov/rulemaking-announcement-wac-173-446b-5-11-23

Rulemaking withdrawal Notice (WAC 173-491) 8/19/2021

This is a rulemaking withdrawal notice for WAC 173-491 WAC Emissions standards and controls for sources emitting gasoline vapors

https://ecology.wa.gov/rulemaking-withdrawal-wac-173-491-08-19-2021

Rulemaking Announcement (WAC 173-446A) 08/04/21

This is a rulemaking announcement (CR-101) for Chapter 173-446A WAC, Criteria for Emissions-Intensive, Trade-Exposed Industries.

https://ecology.wa.gov/rulemaking-announcement-wac-173-446a-08-04-21

Rulemaking Announcement (WAC 173-442; WAC 173-441) 09/21/15

This is a rulemaking announcement for WAC 173-442 Clean Air Rule; WAC 173-441 Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/rulemaking-announcement-wac-173-442;-wac-173-441

Rulemaking Proposal (WAC 173-446A) 12/22/21

This is a rulemaking proposal (CR-102) for Chapter 173-446A WAC, Criteria for Emissions-Intensive, Trade-Exposed Industries.

https://ecology.wa.gov/rulemaking-proposal-wac-173-446a-12-22-21

Rulemaking proposed language (WAC 173-446A) 12/22/21

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-446a-12-22-21

Rulemaking proposal (WAC 173-442; WAC 173-441) 05/31/16

This is a rulemaking proposal (CR-102) for WAC 173-442 Clean Air Rule; WAC 173-441 Reporting of Emissions of Greenhouse Gases

https://ecology.wa.gov/rulemaking-announcement-wac-173-442;-wac-173-1

Rulemaking Proposal (WAC 173-422 and WAC 173-441) 01/05/16

This is a rulemaking proposal (CR-102) for WAC 173-422 and WAC 173-441.

https://ecology.wa.gov/rulemaking-proposal-wac-173-422-and-wac-173-441

Rulemaking proposal language for (WAC 173-441) 05/18/16

This is proposed rule language for WAC 173-441, Reporting of Emissions of Greenhouse Gases

https://ecology.wa.gov/rulemaking-proposal-language-for-wac-173-442;-wac

Rulemaking proposal language for (WAC 173-442) 05/18/16

This is proposed rule language for WAC 173-442 Clean Air Rule.

https://ecology.wa.gov/rulemaking-proposal-language-for-wac-173-442;-1

Rulemaking proposal language for (WAC 173-442)

This is proposed rule language for WAC 173-442.

https://ecology.wa.gov/rulemaking-proposal-language-for-wac-173-442-05

Rulemaking proposed language (WAC 173-441) 05/31/16

This is proposed rule language for WAC 173-441.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-441-05-31-1

Secondary economic impacts analysis (REMI) (WAC 173-442; WAC 173-441) 09/15/16

This is the secondary economic impacts analysis (REMI) for WAC 173-442 and WAC 173-441.

https://ecology.wa.gov/secondary-economic-impacts-analysis-remi-wac-17

Rulemaking Announcement (WAC 173-446) 08/04/21

This is a rulemaking announcement (CR-101) for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/rulemaking-announcement-wac-173-446-08-04-21

Rulemaking Announcement (WAC 173-443; WAC 173-455) 08/16/21

This is a rulemaking announcement (CR-101) for WAC 173-443, Hydrofluorocarbons (HFCs); WAC 173-455, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-announcement-wac-173-443-wac-173-455

Rulemaking Proposal (WAC 173-443; WAC 173-455) 7-13-23

This is a rulemaking proposal (CR-102) for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs) and Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-proposal-wac-173-443;-wac-173-455-7-13-23

Rulemaking proposed language (WAC 173-443) 7-13-23

This is proposed rule language for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-443-7-13-23

Rulemaking proposed language (WAC 173-455) 7-13-23

This is proposed rule language for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-455-7-13-23

Rulemaking Proposal (WAC 173-443; WAC 173-455) 8-31-23

This is a rulemaking continuance (CR-102) for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs) and Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-proposal-wac-173-443;-wac-173-455-8-31-23