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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Vapor Intrusion for TCE

EPA's Region 9 memo Vapor Intrusion response action levels

https://ecology.wa.gov/vi-tce-region-9-memo

Vapor Intrusion guidance for TCE

EPA's Region 10 memo Vapor Intrusion toxicity

https://ecology.wa.gov/vi-tce-region-10-memo

Cleanup Rule exploratory rulemaking process & timeline (as of February 2018)

A notice about our exploratory process and timeline for updating Washington's Cleanup Rule.

https://ecology.wa.gov/noticecleanupruleexplorermfeb2018

Notice to withdraw from the Voluntary Cleanup Program

This document is a form letter to complete and submit when withdrawing from the Voluntary Cleanup Program.

https://ecology.wa.gov/vcp-withdrawalnotice

Ecology's contained-in determination policy memo

Ecology's policy about contained-in determinations.

https://ecology.wa.gov/contained-in-determination-memo

Occidental Storymap Plain Text Accessible

Plain text accessible PDF of the Occidental storymap

https://ecology.wa.gov/occidental-storymap-plain-text

Ecology Listening Session: Implementation Memo No. 22 - Vapor Intrusion Investigations and Short-term Trichloroethene Toxicity

This presentation was for the December 17, 2018 Ecology Listening Session in Bellevue, Washington. Ecology gathered feedback on the Implementation Memo No. 22.

https://ecology.wa.gov/december-2018-listening-session-ppt-vi-and-tce

MTCASGL12.0: Excel workbook for individual hazardous substances

Statistical workbook for calculating cleanup levels for individual hazardous substances for sites being cleaned up under the Model Toxics Control Act.

https://ecology.wa.gov/workbook-for-calculating-cleanup-levels-for-indivi

Overview of Changes to Current Rule (WAC 173-360; WAC 173-360A) 01/24/18

This document provides a summary of the proposed changes to Chapter 173-360 WAC included in Chapter 173-360A WAC, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/overview-of-changes-to-current-rule-wac-173-360;

Emerald Kalama and Fire Mountain Farms Hazardous Waste Petitions Fact Sheet

Decision to approve hazardous waste delisting and treatment variance petitions

https://ecology.wa.gov/hazardous-waste-petition-fact-sheet

Preliminary Draft - Overview of Changes (WAC 173-360; WAC 173-360A) 07/10/17

This document provides a summary of the proposed changes to WAC 173-360, Underground Storage Tank (UST) Regulations, included in the preliminary draft rule.

https://ecology.wa.gov/preliminary-draft-overview-of-changes-wac-173-3

Crosswalk of State and Federal Regulations (WAC 173-360A) 06/30/23

This document identifies each state fund requirement in the proposed amendment of WAC 173-360A, Underground Storage Tank Regulations, and the corresponding requirement in the current federal regulations.

https://ecology.wa.gov/crosswalk-of-state-and-federal-regulations

Expedited rulemaking proposed language (WAC 173-360A) 06/30/23

This is proposed rule language for WAC 173-360A, Underground Storage Tank Regulations.

https://ecology.wa.gov/expedited-rulemaking-proposed-language-wac-173-360a

Expedited Rulemaking Proposal (WAC 173-360A) 06/30/23

This is an expedited rulemaking proposal (CR-105) for WAC 173-360A, Underground Storage Tank Regulations.

https://ecology.wa.gov/expedited-rulemaking-proposal-wac-173-360a

Adopted rule language (WAC 173-360A) 09/--/23

This is adopted rule language for WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/adopted-rule-language-wac-173-360a-09-23

Northeast West Plains PFAS in drinking water sampling area map

West Plains Sampling Map

https://ecology.wa.gov/west-plains-pfas-sampling-area-map