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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 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 173-910) 08/23/16

This is a rulemaking adoption (CR-103) for WAC 173-910 Mecury-Containing Lights Product Stewardship Program.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-910-08-24-16

Rulemaking Adoption Notice (WAC 173-566) 06/25/2019

This is a rulemaking adoption (CR-103) for WAC 173-566 Streamflow Restoration Funding

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-566-06-25-201

Rulemaking Adoption Notice (WAC 173-501) 05/27/2020

Rulemaking Adoption Notice (WAC 173-501) Instream Resources Protection Program - Nooksack Water Resource Inventory Area (WRIA) 1

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-501-05-27-202

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 173-446A) 06-01-22

This is a rulemaking adoption notice (CR-103) for Chapter 173-446A WAC, Criteria for Emissions-Intensive, Trade-Exposed Industries.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-446a-06-01-22

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 173-557) 01/27/15

This is a rulemaking adoption (CR-103) for WAC 173-557 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-557-01-27-15

Rulemaking Adoption Notice (WAC 173-455) 3-3-23

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

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-455-3-3-23

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 173-444) 01/06/21

This is a rulemaking adoption notice for Chapter 173-444 WAC, Clean Energy Transformation Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-444-01-06-21

Rulemaking Adoption Notice (WAC 173-446) 9-29-22

This is a rulemaking adoption notice (CR-103) for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-446-9-29-22

Rulemaking Adoption Notice (WAC 173-455; WAC 173-400) 10/25/18

This is a rulemaking adoption notice (CR-103) for WAC 173-455, Air Quality Fee Rule; WAC 173-400, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-455;-wac-173-4

Rulemaking Adoption Notice (WAC 173-460) 11/22/19

This is a rulemaking adoption notice (CR-103) for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-460-11-22-19

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 173-50) 09/01/23

This is a rulemaking adoption (CR-103) for WAC 173-50 Accreditation of Environmental Laboratories.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-50-09-01-23

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 173-446) 02/21/24

This is a rulemaking adoption notice for Chapter 173-446 WAC, Climate Commitment Act Program Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-446-02-21-24

Rulemaking Adoption Notice (WAC 173-446B)

Rulemaking adoption notice WAC 173-446B

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-446b-10-08-24

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