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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 Adoption Notice (WAC 173-430) 04/12/19

This is a rulemaking adoption notice (CR-103) for Chapter 173-430 WAC, Agricultural Burning.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-430-04-12-19

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 Adoption Notice (WAC 173-441) 02/09/22

This is a rulemaking adoption notice (CR-103) for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-441-02-09-22

Rulemaking Adoption Notice (WAC 173-442; WAC 173-441) 09/15/16

This is a rulemaking adoption (CR-103) for WAC 173-442 Clean Air Rule; WAC 173-441 Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-442;-wac-173-4

Rulemaking Announcement (WAC 173-407) 02/07/17

This is a rulemaking Announcement (CR-101) for WAC 173-407 Carbon Dioxide Mitigation Program, Greenhouse Gases Emissions Performance Standard and Sequestration Plans and Programs for Thermal Electric Generating Facilities

https://ecology.wa.gov/rulemaking-announcement-wac-173-407-20170207

Rulemaking Adoption Notice (WAC 173-455) 3-3-23

This is a rulemaking adoption notice (CR-103) for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-455-3-3-23

Rulemaking Adoption Notice (WAC 173-423; WAC 173-400) 12-19-22

This is a rulemaking adoption notice (CR-103) for Chapter 173-423 WAC, Clean Vehicles Program; Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-423;-wac-173-400-12-19-22

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 173-400) 07/17/18

This is the rulemaking announcement (CR-101) for WAC 173-400, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-announcement-wac-173-400-07-17-18

Rulemaking Adoption Notice (WAC 173-443 12/10/20

This is a rulemaking adoption notice (CR-103P) for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-443-12-10-20

Rulemaking Announcement (WAC 173-405; WAC 173-410; WAC 173-415) 06/20/18

This is a rulemaking announcement (CR-101) for WAC 173-405, Kraft Pulping Mills; WAC 173-410 Sulfite Pulping Mills; WAC 173-415 Primary Aluminum Plants.

https://ecology.wa.gov/rulemaking-announcement-wac-173-405;-wac-173-410;

Rulemaking Adoption Notice (WAC 173-444) 01/06/21

This is a rulemaking adoption notice for Chapter 173-444 WAC, Clean Energy Transformation Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-444-01-06-21

Rulemaking Announcement 07/21/15

This is the first rulemaking announcement (CR 101) for Chapter 173-400 WAC General Regulations for Air Pollution Sources; Chapter 173-401 WAC Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-announcement-wac-173-400;401-12-16-16

Rulemaking Announcement 12/16/16

This is the withdrawn rulemaking announcement (CR 101) for Chapter 173-400 WAC General Regulations for Air Pollution Sources; Chapter 173-401 WAC Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-announcement-wc-173-400;401-07-21-15

Rulemaking Adoption Notice (WAC 173-455; WAC 173-400) 10/25/18

This is a rulemaking adoption notice (CR-103) for WAC 173-455, Air Quality Fee Rule; WAC 173-400, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-455;-wac-173-4

Rulemaking Adoption Notice (WAC 173-460) 11/22/19

This is a rulemaking adoption notice (CR-103) for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-460-11-22-19

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 Adoption Notice (WAC 173-443; WAC 173-455) 11-30-23

This is a rulemaking adoption notice (CR-103) for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs) and Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-443;-wac-173-455-11-30-23

Rulemaking Announcement (WAC 173-400; WAC 173-401) 01-18-24

This is a rulemaking announcement (CR-101) for WAC 173-400, General Regulations for Air Pollution Sources and WAC 173-401, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-announcement-wac-173-400;-wac-173-401-01-18-24

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