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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Research & Data

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

Research & Data icon

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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4469 results
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 Announcement (WAC 173-446) 6-8-23
This is a rulemaking announcement (CR-101) for WAC 173-446, Climate Commitment Act Program Rule.
https://ecology.wa.gov/rulemaking-announcement-wac-173-446-6-8-23
Rulemaking announcement (WAC 173-430) 06/20/18
This is the rulemaking announcement (CR-101) for WAC 173-430, Agricultural Burning.
https://ecology.wa.gov/rulemaking-announcement-wac-173-430-05-20-18
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 173-441) 07/07/21
This is a rulemaking announcement (CR-101) for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/rulemaking-announcement-wac-173-441-07-07-21
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 Announcement (WAC 173-423; WAC 173-400) 01/18/22
This is a rulemaking announcement (CR-101) for WAC 173-423, Clean Vehicles Program and WAC 173-400, General Air Quality Regulations for Air Pollution Sources.
https://ecology.wa.gov/rulemaking-announcement-wac-173-423;-wac-173-400-0
Rulemaking Announcement (WAC 173-443) 07/30/19
This is a rulemaking announcement (CR-101) for WAC 173-443, Hydrofluorocarbons (HFCs).
https://ecology.wa.gov/rulemaking-announcement-wac-173-443-07-30-19
Rulemaking Announcement (WAC 173-444) 10/18/19
This is a rulemaking announcement (CR-101) for WAC 173-444, Clean Energy Transformation Rule.
https://ecology.wa.gov/rulemaking-announcement-wac-173-444-10-18-19
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 Announcement (WAC 173-424; WAC 173-455) 07/20/21
This is a rulemaking announcement (CR-101) for Chapter 173-424 WAC, Clean Fuels Program Rule; Chapter 173-455 WAC, Air Quality Fee Rule.
https://ecology.wa.gov/rulemaking-announcement-wac-173-424;-wac-173-455
Rulemaking Announcement (WAC 173-441; WAC 173-446) 6-26-23
This is a rulemaking announcement (CR-101) for WAC 173-441, Reporting of Emissions of Greenhouse Gases and WAC 173-446, Climate Commitment Act Program Rule.
https://ecology.wa.gov/rulemaking-announcement-wac-173-441;-wac-173-446-6-26-23
Rulemaking Announcement (WAC 173-446) 9-12-23
This is a rulemaking announcement (CR-101) for WAC 173-446, Climate Commitment Act Program Rule, cap-and-invest offsets.
https://ecology.wa.gov/rulemaking-announcement-wac-173-446-9-12-23
Rulemaking Announcement (WAC 173-424) 12-18-23
This is a rulemaking announcement (CR-101) for WAC 173-424, Clean Fuels Program Rule.
https://ecology.wa.gov/rulemaking-announcement-wac-173-424-12-18-23
Rulemaking Announcement (WAC 173-441-446) 04-11-24
This is a rulemaking announcement (CR-101) for WAC 173-441-446, Cap-and-invest Linkage.
https://ecology.wa.gov/rulemaking-announcement-wac-173-441-446-04-11-24
Rulemaking Announcement (WAC 173-443) 10-2-24
CR 101 for WAC 173-443
https://ecology.wa.gov/rulemaking-announcement-wac-173-443-10-2-24
Rulemaking Announcement (WAC 173-448) 10-10-24
This is a rulemaking announcement (CR-101) for WAC 173-448, Air Quality in Overburdened Communities.
https://ecology.wa.gov/rulemaking-announcement-wac-173-448-10-10-24
Rulemaking Announcement (WAC 173-425-430-400) 2-6-25
This is a rulemaking announcement (CR-101) for Chapters 173-425 (outdoor burning), 173-430 (agricultural burning), and 173-400 (general regulation for air pollution sources).
https://ecology.wa.gov/rulemaking-announcement-wac-173-425-430-400-2-6-25
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