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.
SEPADNSAdoptionTemplatePDF
SEPA DNS and Adoption Notice Template PDF Version
https://ecology.wa.gov/sepa-dns-and-adoption-notice-template-pdf-version
SEPADNSAdoptionTemplateWord
SEPA DNS and Adoption Notice Template Word Version
https://ecology.wa.gov/sepa-dns-and-adoption-notice-word-version
SEPADSAdoptionTemplatePDF
SEPA DS and Adoption Notice Template PDF Version
https://ecology.wa.gov/sepa-ds-and-adoption-notice-template-pdf-version
SEPADSAdoptionTemplateWord
SEPADS and Adoption Notice Template Word Version
https://ecology.wa.gov/sepa-ds-and-adoption-notice-template-word-version
SEPA Environmental Checklist
Governmental agencies use this checklist to help determine whether the environmental impacts of your proposal are significant.
https://ecology.wa.gov/sepa-environmental-checklist-doc
SEPA Environmental Checklist
Governmental agencies use this checklist to help determine whether the environmental impacts of your proposal are significant.
https://ecology.wa.gov/sepa-environmental-checklist-pdf
SEPADNSTemplatePDF
SEPA Determination of NonSignificance Template PDF Version
https://ecology.wa.gov/sepadnstemplatepdf
Steps in the state environmental review process
Steps in the state environmental review process for SEPA
https://ecology.wa.gov/sepa-image-accessible
SEPA DNS and request for scope (WAC 173-201A) 9/30/14
This is teh SEPA DNS and request for scope for WAC 173-201A Water quality standards for surface waters of the state of Washington.
https://ecology.wa.gov/sepa-dns-and-request-for-scope-wac-173-201a-9-30
SEPA CR-105
Ecology is conducting expedited rulemaking at the direction of the Washington legislature to amend Chapter 197-11 WAC, SEPA Rules.
https://ecology.wa.gov/sepa-cr-105
SEPA Determination of Nonsignificance
Chapter 246, 2022 Session Law (Substitute Senate Bill 5818) of the Washington State Legislature mandated the Department of Ecology to complete expedited rulemaking by Dec. 31, 2022.
https://ecology.wa.gov/sepa-determination-of-nonsignificance
SEPA Environmental Checklist
The checklist guidance is intended to help applicants complete Section A of the SEPA (State Environmental Policy Act) environmental checklist.
https://ecology.wa.gov/sepa-environmental-checklist
SEPA Determination of Nonsignificance and Checklist (WAC 173-407) 10/04/17
This is SEPA DNS and Checklist 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/sepa-determination-of-nonsignificance-and-checklis
SEPA documentation (WAC 173-557) 09/17/14
This is SEPA documentation for WAC 173-557 Water Resources Management Program (WRMP) for the Spokane River and Spokane Valley Rathdrum Prairie (SVRP) Aquifer and amendment to WAC 173-555-010
https://ecology.wa.gov/sepa-documentation-wac-173-557-09-17-14
SEPA determination of non-significance (WAC 173-442; WAC 173-441) 01/05/16
This is the SEPA determination of non-significance for WAC 173-442 and WAC 173-441
https://ecology.wa.gov/sepa-determination-of-non-significance-wac-173-44
SEPA determination of non-significance 05/31/16
This is the SEPA determination of non-significance for WAC 173-442 Clean Air Rule and WAC 173-441. Reporting of Emissions of Greenhouse Gases rulemaking.
https://ecology.wa.gov/sepa-determination-of-non-significance-05-31-16
SEPA determination of non-significance and addendum (WAC 173-442; WAC 173-441) 09/15/16
This is the SEPA determination of non-significance and addendum for WAC 173-442 and WAC 173-441
https://ecology.wa.gov/sepa-determination-of-non-significance-and-addendu
SEPA determination of nonsignificance
This document is a determination of nonsignificance (DNS) in which Ecology has determined the proposed biosolids general permit will not have a probable significant adverse impact on the environment.
https://ecology.wa.gov/sepa-determination-of-nonsignificance-26201b433614b0478c7dbc8114f0a4ba
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