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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 Announcement (WAC 173-491,400, 455) 07/02/13

This is a rulemaking announcement (CR-101) for Chapter 173-400 WAC General regulation for air pollution sources; Chapter 173-455 WAC Air quality fee regulation and Chapter 173-491 WAC Emission standards and controls for sources emitting gasoline vapors.

https://ecology.wa.gov/rulemaking-announcement-wac-173-491-400-455-07

Rulemaking Proposal (WAC 173-423) 11/07/18

This is a rulemaking proposal (CR-102 form) for WAC 173-423, Low Emission Vehicles.

https://ecology.wa.gov/rulemaking-proposal-wac-173-423-11-07-18

Rulemaking Proposal (WAC 173-423; WAC 173-400) 06/22/21

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

https://ecology.wa.gov/rulemaking-proposal-wac-173-423;-wac-173-400-06

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 Proposal (WAC 173-407) 10/04/17

This is a rulemaking proposal (CR-102) 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-proposal-wac-173-407-20171004

Rulemaking Announcement (WAC 173-455) 09-23-21

This is a rulemaking announcement (CR-101) for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-announcement-wac-173-455-09-23-21

Rulemaking Proposal (WAC 173-405; WAC 173-410; WAC 173-415) 11/07/18

This is a rulemaking proposal (CR-102 form) for WAC 173-405, Kraft Pulping Mills; WAC 173-410, Sulfite Pulping Mills; WAC 173-415, Primary Aluminum Plants.

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

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 Emergency Adoption Notice (WAC 173-443) 10/20/20

This is the fifth emergency rulemaking adoption notice (CR-103E) for WAC 173-443, Hydrofluorocarbons (HFCs).

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

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 Emergency Adoption Notice (WAC 173-443) 06/25/20

This is the fourth emergency rulemaking adoption (CR-103E) for WAC 173-443, Hydrofluorocarbons (HFCs).

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

Rulemaking Emergency Adoption Notice (WAC 173-443) 03/16/20

This is the third emergency rulemaking adoption (CR-103E) for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/rulemaking-emergency-adoption-notice-wac-173-2

Rulemaking Emergency Adoption Notice (WAC 173-443) 11/21/19

This is the second emergency rulemaking adoption (CR-103E) for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/rulemaking-emergency-adoption-notice-wac-173-1

Rulemaking Emergency Adoption Notice (WAC 173-443) 07/30/19

This is the first emergency rulemaking adoption (CR-103E) for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/rulemaking-emergency-adoption-notice-wac-173-443

Rulemaking Proposal (WAC 173-400;401)02/05/18

This is the proposed rulemaking form (CR 102 form)

https://ecology.wa.gov/rulemaking-proposal-wac-173-400;-wac-173-401-02

Rulemaking Announcement (WAC 173-455; WAC 173-400) 04/18/18

This is the rulemaking announcement (CR-101) for WAC 173-455 Air Quality Fee rule; WAC 173-400 General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-announcement-wac173-455;-wac-173-400

Rulemaking Announcement (WAC 173-455; WAC 173-400) 02/06/2017

This is a rulemaking announcement (CR-101) for WAC 173-455 Air Quality Fee Rule; WAC 173-400 General Regulations for Air Pollution Sources.

https://ecology.wa.gov/d1609

Rulemaking Proposal (WAC 173-408) 10-30-23

This is a rulemaking proposal (CR-102) for Chapter 173-408 WAC, Landfill Methane Emissions.

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

Rulemaking Proposal (WAC 173-400; WAC 173-401) 9-18-24

This is a rulemaking proposal (CR-102) for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-proposal-wac-173-400;-wac-173-401-9-18-24

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