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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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Adopted rule language (WAC 173-423) 12/27/18

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

https://ecology.wa.gov/adopted-rule-language-wac-173-423-12-27-18

Adopted rule language (WAC 173-430) 04/12/19

This is adopted rule language for Chapter 173-430 WAC, Agricultural Burning.

https://ecology.wa.gov/adopted-rule-language-wac-173-430-04-12-19

Adopted rule language (WAC 173-444) 01/06/21

This is adopted rule language for WAC 173-444, Clean Energy Transformation Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-444-01-06-21

Adopted rule language (WAC 173-441) 02/09/22

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

https://ecology.wa.gov/adopted-rule-language-wac-173-441-02-09-22

Adopted rule language (WAC 173-446A) 06-01-22

This is adopted rule language for Chapter 173-446A WAC, Criteria for Emissions-Intensive, Trade-Exposed Industries.

https://ecology.wa.gov/adopted-rule-language-wac-173-446a-06-01-22

Adopted rule language (WAC 173-455) 3-3-23

This is adopted rule language for WAC 173-445, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-3-3-23

Adopted rule language (WAC 173-424) 11-28-22

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

https://ecology.wa.gov/adopted-rule-language-wac-173-424-11-28-22

Adopted rule language (WAC 173-446) 9-29-22

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

https://ecology.wa.gov/adopted-rule-language-wac-173-446-9-29-22

Adopted rule language (WAC 173-455) 11-28-22

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

https://ecology.wa.gov/adopted-rule-language-wac-173-455-11-28-22

Adopted rule language (WAC 173-455) 10/25/18

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

https://ecology.wa.gov/adopted-rule-language-wac-173-455-10-25-18

Adopted rule language (WAC 173-443) 12/10/20

This is adopted rule language for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/adopted-rule-language-wac-173-443-12-10-20

Adopted rule language (WAC 173-460) 11/22/19

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

https://ecology.wa.gov/adopted-rule-language-wac-173-460-11-22-19

Adopted rule language (WAC 173-442) 7-18-23

This is adopted rule language for Chapter 173-442 WAC, Clean Air Rule.

https://ecology.wa.gov/adopted-rule-language-(wac-173-442)-7-18-23

Adopted rule language (WAC 173-50) 09/01/23

This is adopted rule language for WAC 173-50 Accreditation of Environmental Laboratories.

https://ecology.wa.gov/adopted-rule-language-wac-173-50-09-01-23

Adopted rule language (WAC 173-443) 11-30-23

This is adopted rule language for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs) and Other Fluorinated Greenhouse Gases.

https://ecology.wa.gov/adopted-rule-language-wac-173-443-11-30-23

Adopted rule language (WAC 173-455) 11-30-23

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

https://ecology.wa.gov/adopted-rule-language-wac-173-455-11-30-23

Adopted rule language (WAC 173-446) 2-21-24

This is adopted rule language for WAC 173-446, Climate Commitment Act Program Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-446-2-21-24

Adopted rule language (WAC 173-446B)

Adopted rule language WAC 173-446B

https://ecology.wa.gov/adopted-rule-language-wac-173-446b-10-08-24

Adopted rule language (WAC 173-441)

Adopted rule language WAC 173-441

https://ecology.wa.gov/adopted-rule-language-wac-173-441-12-03-24

Adopted rule language (WAC 173-446)

Adopted rule language WAC 173-446

https://ecology.wa.gov/adopted-rule-language-wac-173-446-12-03-24