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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 proposed language (WAC 173-423) 11/07/18

This is the proposed rule language for WAC 173-423, Low Emission Vehicles.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-423-11-07-1

Rulemaking proposed language (WAC 173-430) 12/04/18

This is the proposed rule language for WAC 173-430, Agricultural Burning.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-423-12-04-1

Rulemaking proposed language (WAC 173-423) 06/22/21

This is the proposed rule language for Chapter 173-423 WAC, Low Emission Vehicles.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-423-06-22-2

Rulemaking proposed language (WAC 173-441) 10/06/21

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-441-10-06-21

Rulemaking proposed language (WAC 173-407) 10/04/17

This is proposed rule language 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-proposed-language-wac-173-407-2017100

Rulemaking proposed language (WAC 173-423) 09-07-22

This is proposed rule language for Chapter 173-423 WAC, Clean Vehicles Program.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-423-09-07-22

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

Rulemaking proposed language (WAC 173-405) 11/07/18

This is the proposed rule language for WAC 173-405, Kraft Pulping Mills.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-405-11-07-1

Rulemaking proposed language (WAC 173-410) 11/07/18

This is the proposed rule language for WAC 173-410, Sulfite Pulping Mills.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-410-11-07-1

Rulemaking proposed language (WAC 173-444) 09/02/20

This is the proposed rule language for Chapter 173-444 WAC, Clean Energy Transformation Rule.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-444-09-02-2

Rulemaking proposed language (WAC 173-415) 11/07/18

This is the proposed rule language for WAC 173-415, Primary Aluminum Plants.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-415-11-07-1

Rulemaking proposed language (WAC 173-446) 5-16-22

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-446-5-16-22

Rulemaking proposed language (WAC 173-443) 06/16/20

This is the proposed rule language for Chapter 173-443 WAC, Hydrofluorocarbons.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-443-06-16-2

Rulemaking proposed language (WAC 173-424) 07-18-22

This is proposed rule language for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-424-07-18-22

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 173-408) 10-30-23

This is proposed rule language for Chapter 173-408 WAC, Landfill Methane Emissions.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-408-10-30-23

Proposed rule language

Proposed rule language for WAC 173-441, 446

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-441;-wac-173-446-6-27-24

Rulemaking proposed language (WAC 173-401) 9-18-24

This is the proposed rule language for Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-401-9-18-24

Rulemaking proposed language (WAC 173-401, sections 200-920 & 940)

This is the proposed rule language for Chapter 173-401 WAC, General Regulations for Air Pollution Sources

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-401-sections-200-920-940-9-18-24

Rulemaking Proposed language (WAC 173-446) 2-12-25

Proposed rule language for WAC 173-446

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-446-2-12-25