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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Adopted rule language (WAC 173-910) 08/23/16

Thsi is adopted rule language for WAC 173-910 Mercury-Containing Lights Product Stewardship Program.

https://ecology.wa.gov/adopted-rule-language-wac-173-910-08-23-16

Adopted rule language (WAC 173-555) 01/27/15

This is adopted rule language for WAC 173-555 Water Resources Program in the Little Spokane River basin, WRIA 55.

https://ecology.wa.gov/adopted-rule-language-wac-173-555-01-27-15

Adopted rule language (WAC 173-566) 06/25/2019

This is adopted rule language for WAC 173-566 Streamflow Restoration Funding

https://ecology.wa.gov/adopted-rule-language-wac-173-566-06-25-2019

Adopted rule language for (WAC 173-441) 09/15/16

This is adopted rule language for WAC 173-441 Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/adopted-rule-language-for-wac-173-441-09-15-16

Adopted rule language (WAC 173-501) 05/27/2020

This is the adopted rule language for (WAC 173-501) Instream Resources Protection Program - Nooksack Water Resource Inventory Area (WRIA) 1

https://ecology.wa.gov/adopted-rule-language-wac-173-501-05-27-2020

PCR Advisory committee meeting notes

These are notes from an advisory committee meeting, dealing with definitions regarding Washington's requirements for products to contain recycled material.

https://ecology.wa.gov/advisory-committee-meeting-notes

Adopted rule language for (WAC 173-442) 09/21/16

This is adopted rule language for WAC 173-442 Clean Air Rule.

https://ecology.wa.gov/adopted-rule-language-for-wac-173-442-09-21-16

Adopted rule language (WAC 173-557) 01/27/15

This is adopted rule language for WAC 173-557 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer.

https://ecology.wa.gov/adopted-rule-language-wac-173-557-01-27-15

Agenda 02/15/17

Stakeholder meeting agenda 02/15/17

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

Adoption Notice - Focus sheet

This is a rulemaking adoption focus sheet for WAC 173-230 AO 18-02 Wastewater Operator Certification

https://ecology.wa.gov/announcement-focus-sheet

Baffle Funtional Equivenlancy Letter

Letter showing Baffles are functionally equivenant.

https://ecology.wa.gov/aflbafflefel

Agenda 10/18/17

Stakeholder meeting agenda

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

Reissuence Agenda

2017 municiple agenda

https://ecology.wa.gov/agenda

Adopted Rule Text with Tracked and Footnoted Changes to Current Rule (WAC 173-340) 08/23/23

This document tracks and footnotes adopted changes to current WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/adopted-rule-text-with-tracked-and-footnoted-changes-to-current-rule-wac-173-340-08-23-23

Adopted Rule Text with Tracked Changes to Proposed Rule (WAC 173-340) 08/23/23

This document tracks adopted changes to proposed WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/adopted-rule-text-with-tracked-changes-to-proposed-rule-wac-173-340-08-23-23

Adopted Rule Text without Tracked Changes (WAC 173-340) 08/23/23

This document displays WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations, with the adopted rule changes. This document does not track or footnote the changes.

https://ecology.wa.gov/adopted-rule-text-with-no-tracked-changes-wac-173-340-08-23-23

AFFF interactive DEIS plain text

This is the plain text version of the AFFF DEIS.

https://ecology.wa.gov/afff-interactive-deis-plain-text

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

AFFF EIS interactive plain text

This is the plain text version of the interactive AFFF environmental impact statement (EIS).

https://ecology.wa.gov/afff-eis-plain-text