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.
Environmental Covenant for MSW and Limited Purpose Landfills
This is Ecology's official form for covenants with Washington's landfills.
https://ecology.wa.gov/environmental-covenant-for-msw-and-limited-purpose
EPA Davis-Bacon Act Memo November 30, 2009
Application of Davis-Bacon Act Wage Requirements to Fiscal Year 2010 Clean Water State Revolving Fund and Drinking Water State Revolving Fund Assistance Agreements
https://ecology.wa.gov/epa-davis-bacon-act-memo-november-30-2009
NDZ supplemental letter requested by EPA
This is the letter requested of Ecology regarding the NDZ petition.
https://ecology.wa.gov/epalettervesselpumpoutavailabilityoct2016-pdf
Emergency flood response
Outlining ecology's various roles in emergency flood response.
https://ecology.wa.gov/emergency-flood-response-who-does-what
Environmental Review Process Phases diagram
Diagram showing the overall Environmental Review Process phases
https://ecology.wa.gov/environmental-review-phases-diagram
Emergency Rule Adoption Language (WAC 173-03) - 7/20/17
This is emergency rule language for WAC 173-03-900E for Public Records Rule. Ecology is working on a permanent version of this language.
https://ecology.wa.gov/emergency-rule-adoption-language-wac-173-03-7
Emergency Rule Adoption Notice (WAC 173-03) - 7/20/17
This is an emergency adoption of WAC 173-03-900E. Ecology is adopting a permanent version of this emergency rule.
https://ecology.wa.gov/emergency-rule-adoption-notice-wac-173-03-7-20
AO16-07 EPA Approval Letter
This is the letter from the EPA that states that the changes still follow the Clean Water Act and are approved.
https://ecology.wa.gov/epa-approval-letter
AO16-07 EPA Approval Tech Support Doc
This is the technical support document that goes with the EPA Approval Letter.
https://ecology.wa.gov/epa-approval-tech-support-doc
Ecology Water Quality Funded Facility Projects EPA Signage Memo
Ecology Water Quality Funded Facility Projects EPA Signage Memo
https://ecology.wa.gov/epa-signage-memo-for-cwsrf-funded-projects
Equivalent Residential Units (ERU) calculation worksheet tool
Equivalent Residential Units (ERU) calculation tool for use by people applying for Ecology Water Quality Program's Wastewater Facility Hardship Funding.
https://ecology.wa.gov/equivalent-residential-units-eru-calculation-wor
Envirotac II
Letter showing Envirotac II functionally equivalent to C126 (Polyacrylamide for Soil Erosion Protection) and C140 (Dust Control) best management practices for stormwater management.
https://ecology.wa.gov/envirotac2
EarthGuard Fiber Matrix Equivalency
Ecology letter finding EarthGuard Fiber Matrix can be used as temporary erosion control mechanism.
https://ecology.wa.gov/equivalency-earthguard-bmpc120
EPA SSM Policy 06/12/15
EPA's 2015 Startup, Shutdown & Malfunction Policy
https://ecology.wa.gov/epa-ssm-policy-wac-173-400;401-06-12-15
Detalok Equivalency Letter
Letter showing Deltalok product can be used to meet Element 6 (Protect Slopes) of the Stormwater Pollution Prevention Plan for construction sites.
https://ecology.wa.gov/equivalencyletter
EPA letter to Washington Agencies Lower Yakima Valley
EPA letter to Washington state agencies on Lower Yakima Valley
https://ecology.wa.gov/epa-letter-to-washington-agencies-2022
Entiat Approved SMP March 2013
Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology
https://ecology.wa.gov/entiat-approved-smp-march-2013
Enumclaw Approved SMP July 2012
Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology
https://ecology.wa.gov/enumclaw-approved-smp-july-2012
Washington State Climate Resilience Strategy Summary - English
Climate Resilience Strategy Summary in English
https://ecology.wa.gov/english-washington-state-climate-resilience-strategy-summary
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