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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 173-224) 06/22/21

This is a rulemaking adoption (CR-103) for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-224-06-01-21

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 173-323) 12/18/17

This is a rulemaking adoption (CR-103) for WAC 173-323 Grants and Loans.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-323-12-18-17

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 173-407) 02/21/18

This is a rulemaking adoption (CR-103) for WAC 173-407 Greenhouse Gas Mitigation Requirements and Emissions Performance Standard for Power Plants.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-407-02-21-18

Rulemaking Adoption Notice (WAC 173-230) 07/10/19

This is a rulemaking adoption (CR-103) for WAC 173-230 Certification of Wastewater Operators

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-230-07-10-19

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 173-360; 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 173-219) 01/23/18

This is a rulemaking adoption (CR-103) for WAC 173-219 Reclaimed Water

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-219-01-23-18

Rulemaking Adoption Notice (WAC 173-424; WAC 173-455) 11-28-22

This is a rulemaking adoption notice (CR-103) for Chapter 173-424 WAC, Clean Fuels Program Rule; Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-424;-wac-173-45

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 173-224) 06/29/23

This is a rulemaking adoption (CR-103) for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-224-06-29-23

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 173-408) 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 173-400; 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