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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 repeal language (WAC 173-422) 01/26/21

This is the proposed rule repeal language for Chapter 173-422 WAC, Motor Vehicle Emission Inspection.

https://ecology.wa.gov/rulemaking-proposed-repeal-language-wac-173-422

Rulemaking proposed repeal language (WAC 173-422A) 01/26/21

This is the proposed rule repeal language for Chapter 173-422A WAC, Motor Vehicle Emission Inspection.

https://ecology.wa.gov/rulemaking-proposed-repeal-language-wac-173-422a

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

SEPA Determination of Nonsignificance and Checklist (WAC 173-407) 10/04/17

This is SEPA DNS and Checklist 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/sepa-determination-of-nonsignificance-and-checklis

Rulemaking proposed language (WAC 173-455) 09-07-22

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

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

Stakeholder meeting summary (WAC 173-400) 09/12/18

This is the meeting summary for the 9/12/18 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/stakeholder-meeting-summary-wac-173-400-09-12-18

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

Stakeholder meeting summary (WAC 173-400) 10/16/18

This is the meeting summary for the 10/16/18 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/stakeholder-meeting-summary-wac-173-400-10-16-18

Stakeholder meeting summary (WAC 173-400) 12/20/18

This is the meeting summary for the 12/20/18 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/stakeholder-meeting-summary-wac-173-400-12-20-18

Stakeholder meeting summary (WAC 173-400) 1/24/19

This is the meeting summary for the 1/24/19 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/stakeholder-meeting-summary-wac-173-400-1-24-19

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 173-443) 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 Rule 400 (WAC 173-400; WAC 173-401)

This is the proposed rule for Chapter 173-400 WAC.

https://ecology.wa.gov/rulemaking-proposed-rule-400-wac-173-400-wac-173

Rulemaking proposed language (WAC 173-455) 06/20/18

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-455-06-20-1

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 173-460) 06/04/19

This is the proposed rule language for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-460-06-04-1

Simplot comments (WAC 173-460) 12/07/18

These are Simplot's 12/7/18 comments to remove ammonium sulfate from the toxic air pollutant list, Chapter 173-460 WAC.

https://ecology.wa.gov/simplot-comments-wac-173-460-12-07-18

Rulemaking proposed language (WAC 173-455) 07-18-22

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

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-455-07-18-22