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.

See more about this collection...

Preliminary rule language (WAC 173-323) 7/25/17

Preliminary rule language for WAC 173-323

https://ecology.wa.gov/preliminary-rule-language

Preliminary Draft State Technical Support Document (WAC 173-201A) 06/10/20

This preliminary draft document provides background and technical information for PCB Variances on the Spokane River. Chapter 173-201A WAC.

https://ecology.wa.gov/preliminary-draft-state-technical-support-document

Pre-proposal statement of inquiry (CR-101)

https://ecology.wa.gov/pre-proposal-statement-of-inquiry-cr-101-e7e3da1ef02576fe3379034dfa1d6a66

Presentation (WAC 173-408) 5-4-23

This is a presentation for the May 4, 2023 stakeholder meeting for Chapter 173-408 WAC, Landfill Methane Emissions.

https://ecology.wa.gov/presentation-wac-173-408-5-4-23

Presentation (WAC 173-408) 3-30-23

This is a presentation for the March 30, 2023 stakeholder meeting for Chapter 173-408 WAC, Landfill Methane Emissions.

https://ecology.wa.gov/presentation-wac-173-408-3-30-23

Presentation (WAC 173-423) 04/19/22

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

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

Presentation (WAC 173-423) 02/28/22

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

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

Preliminary draft toxics language and toxics table (WAC 173-201A) 9/30/14

This is the Preliminary draft toxics language and toxics table with footnotes at WAC 173-201A-240 for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-toxics-language-and-toxics-table

Preproposal Statement of Inquiry (CR-101) (WAC 173-360; WAC 173-360A) 03/23/2016

This is a rulemaking announcement (CR-101) for WAC 173-360 Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/pre-proposal-statement-of-inquiry-cr-101-wac-17

Presentation (WAC 173-424) 08-23-22

This is a presentation for the 8/23/22 public hearing for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/presentation-wac-173-424-08-23-22

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

This is a presentation for the 4/13/22 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

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

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

This is a presentation for the 3/15/22 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

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

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

This is a presentation for the 1/27/22 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

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

Sand & Gravel General permit preliminary draft language

This is the preliminary draft language for the 2016-2021 Sand & Gravel general permit.

https://ecology.wa.gov/preliminarydraft

Prelimary Draft Sand and Gravel

Draft language for the for Sand and Gravel Permit. Includees Process Water, Stormwater, and Mine Dewatering Water Discharges Associated with Sand and Gravel Operations, Rock Quarries, and Similar Mining Facilities, Including Stockpiles of Mined Materials, Concrete Batch Operations and Hot Mix Asphalt Operations.

https://ecology.wa.gov/preliminarydraft-1

Presentation (WAC 173-408) 6-21-23

This is a presentation for the June 21, 2023 stakeholder meeting for Chapter 173-408 WAC, Landfill Methane Emissions.

https://ecology.wa.gov/presentation-(wac-173-408)-6-21-23

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

This is a presentation for the April 18, 2024 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

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

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

This is a presentation for the May 15, 2024 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

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

Presentation (WAC 173-423) 1-30-25

This is a presentation for the January 30, 2025 industry focused meeting for Chapter 173-423 WAC, Clean Vehicles Program rulemaking.

https://ecology.wa.gov/presentation-wac-173-423-1-30-25

Presentation (WAC 173-423) 2-3-25

This is a presentation for the February 3, 2025 public information session for Chapter 173-423 WAC, Clean Vehicles Program rulemaking.

https://ecology.wa.gov/presentation-wac-173-423-2-3-25