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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 173-444) 01/06/21

This is adopted rule language for WAC 173-444, Clean Energy Transformation Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-444-01-06-21

Adopted rule language (WAC 173-455) 3-3-23

This is adopted rule language for WAC 173-445, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-3-3-23

Adopted rule language (WAC 173-455) 11-28-22

This is adopted rule language for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-11-28-22

Adopted rule language (WAC 173-455) 10/25/18

This is adopted rule language for Chapter 173-455, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-10-25-18

Agenda 02/15/17

Stakeholder meeting agenda 02/15/17

https://ecology.wa.gov/agenda-wac-173-400;401-02-15-17

Agenda (WAC 173-424) 04/13/22

This is the agenda for the April 13, 2022 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/agenda-wac-173-424-04-13-22

Agenda (WAC 173-423-400) 04/19/22

This is the agenda for the April 19, 2022 stakeholder meeting for Chapter 173-423 WAC, Clean Vehicles Program and Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/agenda-wac-173-423-400-04-19-22

Agenda (WAC 173-424) 03/15/22

This is the agenda for the March 15, 2022 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/agenda-wac-173-424-03-15-22

Agenda (WAC 173-423-400) 02/28/22

This is the agenda for the February 28, 2022 stakeholder meeting for Chapter 173-423 WAC, Clean Vehicles Program and Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/agenda-wac-173-423-400-02-28-22

Adopted rule language (WAC 173-443) 12/10/20

This is adopted rule language for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/adopted-rule-language-wac-173-443-12-10-20

Agenda 10/18/17

Stakeholder meeting agenda

https://ecology.wa.gov/agenda-wac-173-400;401-10-18-17

Agenda 11/29/17

This is the agenda for the 11/29/17 stakeholder meeting.

https://ecology.wa.gov/agenda-wac-173-400;401-11-29-17

Agenda (WAC 173-424) 01/27/22

This is the agenda for the January 27, 2022 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/agenda-wac-173-424-01-27-22

Agenda (WAC 173-423-400) 6-14-22

This is the agenda for the June 14, 2022 stakeholder meeting for Chapter 173-423 WAC, Clean Vehicles Program and Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/agenda-wac-173-423-400-6-14-22

Agenda (WAC 173-424) 10/06/21

This is the agenda for the October 6, 2021 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/agenda-wac-173-424-10-06-21

Adopted rule language (WAC 173-460) 11/22/19

This is adopted rule language for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/adopted-rule-language-wac-173-460-11-22-19

Adopted rule language (WAC 173-443) 11-30-23

This is adopted rule language for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs) and Other Fluorinated Greenhouse Gases.

https://ecology.wa.gov/adopted-rule-language-wac-173-443-11-30-23

Adopted rule language (WAC 173-455) 11-30-23

This is adopted rule language for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-11-30-23

Agenda (WAC 173-400; WAC 173-401) 4-18-24

This is the agenda for the April 18, 2024 stakeholder meeting for Chapter 173-440 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/agenda-wac-173-400;-wac-173-401-4-18-24

Agenda (WAC 173-400; WAC 173-401) 5-15-24

This is the agenda for the May 15, 2024 stakeholder meeting for Chapter 173-440 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/agenda-wac-173-400;-wac-173-401-5-15-24