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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 Proposal (WAC 173-224) 03/22/23

This is a rulemaking proposal (CR-102) for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/rulemaking-proposal-wac-173-224-03-22-23

Rulemaking Proposal (WAC 173-228) 10/04/17

This is a rulemaking proposal (CR-102) for WAC 173-228 Sewage No Discharge Zones

https://ecology.wa.gov/rulemaking-proposal-wac-173-228-10-04-17

Rulemaking Proposal (WAC 173-423) 11/07/18

This is a rulemaking proposal (CR-102 form) for WAC 173-423, Low Emission Vehicles.

https://ecology.wa.gov/rulemaking-proposal-wac-173-423-11-07-18

Rulemaking Proposal (WAC 173-337) 12/07/22

This is a rulemaking proposal (CR-102) for WAC 173-337 Safer Products Restrictions and Reporting.

https://ecology.wa.gov/rulemaking-proposal-wac-173-337-12-07-22

Rulemaking Proposal (WAC 173-423; WAC 173-400) 06/22/21

This is a rulemaking proposal (CR-102) for Chapter 173-423 WAC, Low Emission Vehicles; Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposal-wac-173-423;-wac-173-400-06

Rulemaking Proposal (WAC 173-350) 1/23/18

This is a rulemaking proposal (CR-102) for WAC 173-350 Solid Waste Handling Standards

https://ecology.wa.gov/rulemaking-proposal-wac-173-350-1-23-18

Rulemaking Proposal (WAC 173-224) 03/16/21

This is a rulemaking proposal (CR-102) for WAC 173-224 Water Quality Permit Fees

https://ecology.wa.gov/rulemaking-proposal-wac-173-224-03-16-21

Rulemaking Proposal (WAC 173-340) 02/15/23

This is a rulemaking proposal (CR-102) for WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/rulemaking-proposal-wac-173-340-02-15-23

Rulemaking Proposal (WAC 173-323) 10/03/17

This is a rulemaking proposal (CR-102) for WAC 173-323 Grants and Loans.

https://ecology.wa.gov/rulemaking-proposal-wac-173-323-10-03-17

Rulemaking Proposal (WAC 173-407) 10/04/17

This is a rulemaking proposal (CR-102) for WAC 173-407 Carbon Dioxide Mitigation Program, Greenhouse Gases Emissions Performance Standard and Sequestration Plans and Programs for Thermal Electric Generating Facilities

https://ecology.wa.gov/rulemaking-proposal-wac-173-407-20171004

Rulemaking proposal (WAC 173-230) 03/12/19

This is a rulemaking proposal (CR-102) for WAC 173-230 Wastewater Operator Certification

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-230-03-12-1

Rulemaking Proposal (WAC 173-422 and WAC 173-441) 01/05/16

This is a rulemaking proposal (CR-102) for WAC 173-422 and WAC 173-441.

https://ecology.wa.gov/rulemaking-proposal-wac-173-422-and-wac-173-441

Rulemaking Proposal (WAC 173-423; WAC 173-400) 9-7-22

This is a rulemaking proposal (CR-102) for Chapter 173-423 WAC, Clean Vehicles Program; Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-proposal-wac-173-423;-wac-173-400-9-7-2

Rulemaking Proposal (WAC 173-405; WAC 173-410; WAC 173-415) 11/07/18

This is a rulemaking proposal (CR-102 form) for WAC 173-405, Kraft Pulping Mills; WAC 173-410, Sulfite Pulping Mills; WAC 173-415, Primary Aluminum Plants.

https://ecology.wa.gov/rulemaking-proposal-wac-173-405;-wac-173-410;-wac

Rulemaking Proposal (WAC 173-360; WAC 170-360A) 01/24/18

This is a rulemaking proposal (CR-102) for WAC 173-360; WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/rulemaking-proposal-wac-173-360;-wac-170-360a-01

Rulemaking Proposal (WAC 173-400;401)02/05/18

This is the proposed rulemaking form (CR 102 form)

https://ecology.wa.gov/rulemaking-proposal-wac-173-400;-wac-173-401-02

Rulemaking Proposal (WAC 173-424; WAC 173-455) 07-18-22

This is a rulemaking proposal (CR-102) for Chapter 173-424 WAC, Clean Fuels Program Rule; Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-proposal-wac-173-424;-wac-173-455-07-18

Rulemaking Proposal (WAC 173-408) 10-30-23

This is a rulemaking proposal (CR-102) for Chapter 173-408 WAC, Landfill Methane Emissions.

https://ecology.wa.gov/rulemaking-proposal-wac-173-408-10-30-23

Rulemaking Proposal (WAC 173-400; WAC 173-401) 9-18-24

This is a rulemaking proposal (CR-102) for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-proposal-wac-173-400;-wac-173-401-9-18-24

Rulemaking Proposal (WAC 173-339) 02/6/25

This is a rulemaking proposal (CR-102) for WAC 173-339 Title.

https://ecology.wa.gov/rulemaking-proposal-wac-173-339-01-30-25