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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 Proposal (WAC 173-430) 12/04/18

This is a rulemaking proposal (CR-102 form) for WAC 173-430, Agricultural Burning.

https://ecology.wa.gov/rulemaking-proposal-wac-173-430-12-04-18

Rulemaking proposed language (WAC 173-400) 06/22/21

This is the proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-06-22-2

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 Proposal (WAC 173-441) 10/06/21

This is a rulemaking proposal (CR-102) for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/rulemaking-proposal-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 Proposal (WAC 173-455) 09-07-22

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

https://ecology.wa.gov/rulemaking-proposal-wac-173-455-09-07-22

Rulemaking Proposal (WAC 173-423; WAC 173-400) 9-7-22

This is a rulemaking proposal (CR-102) for Chapter 173-423 WAC, Clean Vehicles Program; Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposal-wac-173-423;-wac-173-400-9-7-2

Rulemaking proposed language (WAC 173-400) 09-07-22

This is proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-09-07-22

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 Proposal (WAC 173-444) 09/02/20

This is a rulemaking proposal (CR-102) for Chapter 173-444 WAC, Chapter 173-444 WAC, Clean Energy Transformation Rule.

https://ecology.wa.gov/rulemaking-proposal-wac-173-444-09-02-20

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 Proposal (WAC 173-443) 06/16/20

This is a rulemaking proposal (CR-102) for Chapter 173-443 WAC, Hydrofluorocarbons.

https://ecology.wa.gov/rulemaking-proposal-wac-173-443-06-16-20

Rulemaking Proposal (WAC 173-455; WAC 173-400) 06/20/18

This is a rulemaking proposal (CR-102 form) for WAC 173-455, Air Quality Fee Rule; WAC 173-400, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposal-wac-173-455;-wac-173-400-06

Rulemaking proposed language (WAC 173-400) 06/20/18

This is the proposed rule language for WAC 173-400, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-06-20-1

Rulemaking Proposal (WAC 173-460) 06/04/19

This is a rulemaking proposal (CR-102) for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/rulemaking-proposal-wac-173-460-06-04-19

Rulemaking Proposal (WAC 173-424; WAC 173-455) 07-18-22

This is a rulemaking proposal (CR-102) for Chapter 173-424 WAC, Clean Fuels Program Rule; Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-proposal-wac-173-424;-wac-173-455-07-18

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

Rulemaking proposed language (WAC 173-400) 9-18-24

This is the proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-400-9-18-24

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