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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 173-400) 10/25/18

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

https://ecology.wa.gov/adopted-rule-language-wac-173-400-10-25-18

Adopted rule language (WAC 173-400) 08/16/18

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

https://ecology.wa.gov/adopted-rule-language-wac-173-400-08-16-18

Adopted rule language (WAC 173-405) 04/23/19

This is adopted rule language for Chapter 173-405 WAC, Kraft Pulping Mills.

https://ecology.wa.gov/adopted-rule-language-wac-173-405-04-23-19

Adopted rule language (WAC 173-407) 02/21/18

This is adopted rule language for WAC 173-407 Greenhouse Gas Mitigation Requirements and Emissions Performance Standard for Power Plants.

https://ecology.wa.gov/adopted-rule-language-wac-173-407-02-21-18

Adopted rule language (WAC 173-422) 06/02/21

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

https://ecology.wa.gov/adopted-rule-language-wac-173-422-06-02-21

Adopted rule language (WAC 173-400) 11/29/21

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

https://ecology.wa.gov/adopted-rule-language-wac-173-400-11-29-21

Adopted rule language (WAC 173-400) 12/19/22

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

https://ecology.wa.gov/adopted-rule-language-wac-173-400-12-19-22

Adopted rule language (WAC 173-423) 12/19/22

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

https://ecology.wa.gov/adopted-rule-language-wac-173-423-12-19-22

Adopted rule language (WAC 173-423) 11/29/21

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

https://ecology.wa.gov/adopted-rule-language-wac-173-423-11-29-21

Adopted rule language (WAC 173-422A) 06/02/21

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

https://ecology.wa.gov/adopted-rule-language-wac-173-422a-06-02-21

Adopted rule language (WAC 173-410) 04/23/19

This is adopted rule language for Chapter 173-410 WAC, Sulfite Pulping Mills.

https://ecology.wa.gov/adopted-rule-language-wac-173-410-04-23-19

Adopted rule language (WAC 173-401) 08/16/18

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

https://ecology.wa.gov/adopted-rule-language-wac-173-401-08-16-18

Adopted rule language (WAC 173-415) 04/23/19

This is adopted rule language for Chapter 173-415 WAC, Primary Aluminum Plants.

https://ecology.wa.gov/adopted-rule-language-wac-173-415-04-23-19

Adopted rule language (WAC 173-360; WAC 173-360A) 07/17/18

This is the adopted rule language for WAC 173-360; WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/adopted-rule-language-wac-173-360;-wac-173-360a

Adopted rule language (WAC 173-360A) 09/--/23

This is adopted rule language for WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/adopted-rule-language-wac-173-360a-09-23

Adopted rule language (WAC 173-408) 5-13-24

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

https://ecology.wa.gov/adopted-rule-language-wac-173-408-5-13-24

Adopted rule language (WAC 173-400) 2-12-25

This is the adopted rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources, sections -020, -030, -082, -091, -101, -110, -112, -113, -114, -171, -175, -180, -230, -240, -740, -930.

https://ecology.wa.gov/adopted-rule-language-wac-173-400-2-12-25

Adopted rule language (WAC 173-400, sections 025, 040, 050, 060, 105) 2-12-25

This is the adopted rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources, sections 025, 040, 050, 060, 105.

https://ecology.wa.gov/adopted-rule-language-wac-173-400-sections-025-040-050-060-105-2-12-25

Adopted rule language (WAC 173-401, section 925) 2-12-25

This is the adopted rule language for Chapter 173-401 WAC, Operating Permit Regulation, section -925 and repeal of section -645.

https://ecology.wa.gov/adopted-rule-language-wac-173-401-section-925-2-12-25

Adopted rule language (WAC 173-401, sections 200, 300, 400, 500, 600) 2-12-25

This is the adopted rule language for Chapter 173-401 WAC, Operating Permit Regulation, sections -200, -300, -400, -500, -600, -620, -700, -722, -724, -735, -900, -915, -920, -940.

https://ecology.wa.gov/adopted-rule-language-wac-173-401-sections-200-300-400-500-600-2-12-25