Regulations & Permits

Use this portal to filter and search for all of our regulatory information.

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

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Laws, rules, & rulemaking

Rulemaking Adoption Notice (WAC 173-430) 04/12/19

This is a rulemaking adoption notice (CR-103) for Chapter 173-430 WAC, Agricultural Burning.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-430-04-12-19

Rulemaking Adoption Notice (WAC 173-423) 12/27/18

This is a rulemaking adoption notice (CR-103) for WAC 173-423, Low Emission Vehicles.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-423-12-27-18

Rulemaking Adoption Notice (WAC 173-423; WAC 173-400) 11/29/21

This is a rulemaking adoption notice (CR-103) for Chapter 173-423 WAC, Clean Vehicles Program; Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-423;-wac-173-40

Rulemaking Adoption Notice (WAC 173-422; WAC 173-422A) 06/02/21

This is a rulemaking adoption notice for Chapters 173-422 and 173-422A WAC, Motor Vehicle Emission Inspection.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-422;-wac-173-4

Rulemaking Adoption Notice (WAC 173-441) 02/09/22

This is a rulemaking adoption notice (CR-103) for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-441-02-09-22

Rulemaking Adoption Notice (WAC 173-442; WAC 173-441) 09/15/16

This is a rulemaking adoption (CR-103) for WAC 173-442 Clean Air Rule; WAC 173-441 Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-442;-wac-173-4

Rulemaking Adoption Notice (WAC 173-423; WAC 173-400) 12-19-22

This is a rulemaking adoption notice (CR-103) for Chapter 173-423 WAC, Clean Vehicles Program; Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-423;-wac-173-400-12-19-22

Rulemaking Adoption Notice (WAC 173-405; WAC 173-410; WAC 173-415) 04/23/19

This is a rulemaking adoption notice (CR-103) for Chapter 173-405 WAC, Kraft Pulping Mills; Chapter 173-410 WAC, Sulfite Pulping Mills; Chapter 173-415 WAC, Primary Aluminum Plants.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-405;-wac-173-4

Rulemaking Adoption Notice (WAC 173-443 12/10/20

This is a rulemaking adoption notice (CR-103P) for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-443-12-10-20

Rulemaking Adoption Notice (WAC 173-360; WAC 173-360A) 07/17/18

This is the rulemaking adoption (CR-103) WAC 173-360; WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-360;-wac-173-3

Rulemaking Adoption Notice (WAC 173-400; WAC 173-401) 08/16/18

This is a rulemaking adoption notice (CR-103) for Chapter 173-400 WAC, General Regulations for Air Pollution; Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-400;-wac-173-4

Rulemaking Adoption Notice (WAC 173-360; WAC 173-360A) 07/18/2018

This is a rulemaking adoption (CR-103) for WAC 173-360A, Underground Storage Tank Regulations.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-360;-wac-1-1

Rulemaking Adoption Notice (WAC 173-337) 05/31/23

This is a rulemaking adoption (CR-103) for WAC 173-337 Safer Products Restrictions and Reporting

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-337

Rulemaking Adoption Notice (WAC 173-442) 7-18-23

This is a rulemaking adoption notice (CR-103) for Chapter 173-442 WAC, Clean Air Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-(wac-173-442)-7-18-23

Rulemaking Adoption Notice (WAC 173-340) 08/23/23

This is a rulemaking adoption (CR-103) for WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-340-08-23-23

Rulemaking Adoption Notice (WAC 173-360A) 09/--/23

This is a rulemaking adoption (CR-103) for WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-360a-09-23

Rulemaking Adoption Notice (WAC 173-443; WAC 173-455) 11-30-23

This is a rulemaking adoption notice (CR-103) for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs) and Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-443;-wac-173-455-11-30-23

Rulemaking Adoption Notice (WAC 173-408) 5-13-24

This is a rulemaking adoption notice (CR-103) for Chapter 173-408 WAC, Landfill Methane Emissions.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-408-5-13-24

Rulemaking Adoption Notice (WAC 173-441, 446)

Rulemaking adoption notice WAC 173-441, 446

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-441-446-12-03-24

Rulemaking Adoption Notice (WAC 173-400; WAC 173-401) 2-12-25

This is a rulemaking adoption notice (CR-103) for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-400;-wac-173-401-2-12-25