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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2018 update on guidelines for landfill post-closure in Washington

2018 Solid Waste Conference presentation on landfill post-closure regulatory guidelines

https://ecology.wa.gov/landfillpostclosurepresentation092718

Licensed Tire Handlers

A list of Washington businesses licensed to store and/or transport waste tires.

https://ecology.wa.gov/licensedtirehandlers

LightRecycle producers list 2018

2018 list of producers participating in the Washington Department of Ecology's LightRecycle program

https://ecology.wa.gov/lightrecycle-producers-list-2018

LightRecycle Producers List 2023

This document lists producers of mercury lights in Washington state.

https://ecology.wa.gov/lightrecycle-producers-list-2020

50th Anniversary letter from Gov. Inslee (2020)

Letter congratulating Ecology on our fifty-year anniversary.

https://ecology.wa.gov/letter-from-gov-inslee-2020

LightRecycle producers list Jan. 2019

This is a list of mercury light producers participating in Ecology's LightRecycle Washington program.

https://ecology.wa.gov/lightrecycle-producers-list-jan-2019

Fire Mountain Farms landowner agreement

Landowner consent for the application of biosolids

https://ecology.wa.gov/landowner-agreement

Legal authorities

Summary of local, state and federal legal authorities for commercial fish farms

https://ecology.wa.gov/legal-authorities

Landfill Report 2015

A spreadsheet showing quantities of materials collected and broken down by material type for each landfill facility.

https://ecology.wa.gov/landfillreport2015

Letter to Chairman Barrossa Senate Committee on Environment and Public Works

A letter from the Washington Department of Ecology, signed by Director Maia Bellon, to Senators John Barrsso and Tom Carpenter, Chairman and ranking member of the Senate Environment & Public Works Committee, respectively, setting the record straight on why a water quality certification was denied to Millennium Bilk Terminals - Longview.

https://ecology.wa.gov/letter-to-chairman-barrossa

Letter to Colonel Mark Geraldi, U.S. Army Corps of Engineers

A letter to Colonel Mark Geraldi, U.S. Army Corps of Engineers, from the Washington Department of Ecology, signed by Director Maia Bellon, expressing deep concern over its restarting the federal permitting process for Millennium Bulk Terminals in Longview.

https://ecology.wa.gov/letter-to-colonel-geraldi

Letter to Army Corps LTG Semonite from Wash ATG Bob Ferguson

A letter dated Oct. 10, 2018, from Washington Attorney General Bob Ferguson to Army Corps' Lieutenant General Todd Semonite regarding Millennium Bulk terminals in Longview

https://ecology.wa.gov/letter-to-lieutenant-general-todd-t-semonite-from

Low-Impact Development Operations & Maintenance Guidance Document

Guidance document for Western Washington Low-Impact Development Operations & Maintenance.

https://ecology.wa.gov/lido-mguidancedocument

Low Impact Development Operations & Maintenance Training

Low Impact Development Operations and Maintenance Training

https://ecology.wa.gov/lido-mtrainingpowerpoint

Optional LID Reporting Template

This is an excel file to help permittees organize the summary report for the LID and track their efforts.

https://ecology.wa.gov/lid-summaryreport-template

Langley Approved SMP December 2013

Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology

https://ecology.wa.gov/langley-approved-smp-december-2013

Langley Critical Areas Ordinance - December 2013

Critical Areas Ordinances adopted under the Growth Management Act

https://ecology.wa.gov/langley-critical-areas-ordinance-december-2013

Leavenworth Approved SMP September 2014

Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology

https://ecology.wa.gov/leavenworth-approved-smp-september-2014

Lewis County Approved SMP November 2017

Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology

https://ecology.wa.gov/lewis-county-approved-smp-november-2017

LightRecycle Producers List 2024

This is a list of producers of mercury lights that are regulated by the Washington Department of Ecology.

https://ecology.wa.gov/lightrecycle-producers-list-2024