Research & Data

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

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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Toxics Release Inventory

The Toxics Release Inventory (TRI) identifies chemicals used at businesses or facilities.

https://ecology.wa.gov/research-data/data-resources/toxics-release-inventory

Air quality studies

Information about air quality studies we conduct.

https://ecology.wa.gov/research-data/scientific-reports/air-quality-studies

Washington Emissions Inventory Reporting System (WEIRS) Emissions Inventory Codes

Emissions Inventory Codes for Washington Emissions Inventory Reporting System (WEIRS), 12/20/19

https://ecology.wa.gov/20191220emissionsinventorycodes

Washington Emissions Inventory Reporting System (WEIRS) training, 2/8/23

This is the presentation for the February 8, 2023 training about Washington Emissions Inventory Reporting System (WEIRS).

https://ecology.wa.gov/20230208weirstraining

Washington Emissions Inventory Reporting System (WEIRS) training, 2/1/24

This is the presentation for the February 1, 2024 training about Washington Emissions Inventory Reporting System (WEIRS).

https://ecology.wa.gov/20240201weirstraining

Prevention of Significant Deterioration baseline emissions inventory technical support

This is the technical support document for the baseline emissions inventory for facilities with a Prevention of Significant Deterioration permit.

https://ecology.wa.gov/201603prevofsignificantdeteriorationtechsupport

Adopted rule language (WAC 173-446B)

Adopted rule language WAC 173-446B

https://ecology.wa.gov/adopted-rule-language-wac-173-446b-10-08-24

Draft offset protocol language

Draft offset protocol language for ozone depleting substances projects

https://ecology.wa.gov/draft-offset-protocol-language-173-446-wac-10-1-24

Rulemaking Announcement (WAC 173-423) 11-20-24

CR 101 for WAC 173-423

https://ecology.wa.gov/rulemaking-announcement-wac-173-423-11-20-24

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

Presentation (WAC 173-446) 10-21-24

This is a presentation for the October 21, 2024 public meeting for Chapter 173-446 WAC, Cap-and-invest rulemaking.

https://ecology.wa.gov/presentation-wac-173-446-11-14-23-540261c1d121085d0b0e570d950387a7

Environmental Justice Presentation (WAC 173-446) 10-21-24

This is a presentation for the October 21, 2024 Environmental Justice listening session for Chapter 173-446 WAC, Cap-and-invest rulemaking.

https://ecology.wa.gov/presentation-wac-173-446-11-14-23-540261c1d121085d0b0e570d950387a7-1ecee0d19f94900fb988911963b64367

Presentation (WAC 173-424) 9-26 2024

Slideshow presentation from the Sept. 26, 2024, CFS Rulemaking Update webinar

https://ecology.wa.gov/presentation-wac-173-424-9-26-2024

Chapter 173-441 and -446 WAC Linkage Rulemaking - Electricity Considerations

Slideshow presentation from the Cap-and-Invest linkage rulemaking public meeting (Nov. 19, 2024)

https://ecology.wa.gov/presentation-wac-173-441-446-11-19-24

Storm Seeds notice of construction (NOC) application and associated documents

This is the air quality notice of construction application and associated documents for Storm Seeds in Moses Lake.

https://ecology.wa.gov/20240823stormseedsnocapp

Workshop #10 Slides - Stakeholders

Stakeholder slides for Workshop #10

https://ecology.wa.gov/workshop-10-slides-stakeholders

Workshop #10 Slides - Tribes

Tribal slides for Workshop #10

https://ecology.wa.gov/workshop-10-slides-tribes

Wood-fired hydronic heaters that meet Washington standards, October 1, 2024

This is the October 1, 2024 list of wood-fired hydronic heaters that meet Washington standards.

https://ecology.wa.gov/20241001hydronicheaters

Questions (WAC 173-441, 446) 11-19-24

Questions from participants of the Nov. 19, 2024, linkage rulemaking info session

https://ecology.wa.gov/questions-wac-173-441-446-11-19-24

Technical Support Document - Small Water Heaters and Steam-Generating Boilers

Technical support document for general order for small water heaters and steam-generating boilers

https://ecology.wa.gov/genorder_boiler_background