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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Proposed Rule Text without Tracked Changes (WAC 173-340) 02/15/23

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

https://ecology.wa.gov/proposed-rule-text-with-no-tracked-changes-to-curr

Proposed Rule Text with Tracked and Footnoted Changes (WAC 173-340) 02/15/23

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

https://ecology.wa.gov/proposed-rule-text-with-tracked-and-footnoted-chan

MTCAStat97: Backgound Module

A statistical analysis tool / workbook for analyzing background data for sites cleaned up under the Model Toxics Control Act.

https://ecology.wa.gov/mtcastat97backgroundmodule

MTCAStat97: Site Module

A statistical analysis tool / workbook for calculating compliance statistics for sites cleaned up under the Model Toxics Control Act.

https://ecology.wa.gov/mtcastat97sitemodule

MTCASTtat97: Technical supplement #1

Statistical guidance for using MTCAStat97 for sites cleaned up under the Model Toxics Control Act.

https://ecology.wa.gov/mtcastattechsupplement

Rulemaking Announcement (WAC 173-340) 12/20/18

This is a rulemaking announcement (CR-101) for WAC 173-340, Model Toxics Control Act - Cleanup

https://ecology.wa.gov/rulemaking-announcement-wac-173-340-12-20-18

Rulemaking Proposal (WAC 173-340) 02/15/23

This is a rulemaking proposal (CR-102) for WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/rulemaking-proposal-wac-173-340-02-15-23

Package A - Natural Attenuation Tool (Modules 1,2,3)

A calculation tool for demonstrating natural attenuation of groundwater is occurring and help predict when groundwater cleanup levels will be met under the Model Toxics Control Act.

https://ecology.wa.gov/pkganaturalattenuation

Rulemaking proposed language (WAC 173-340) 02/15/23

This is proposed rule language for WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-340-02-15-23

Package B - Natural Attenuation (Modules 4,5,6)

A calculation tool for demonstrating natural attenuation of groundwater is occurring and help predict when groundwater cleanup levels will be met under the Model Toxics Control Act.

https://ecology.wa.gov/pkgbnaturalattenuation

Public hearing presentation (WAC 173-360; 173-360A) 02/28/18

This is the presentation provided at the public hearings on the rulemaking proposal for the underground storage tank regulations (WAC 173-360; 173-360A). The hearings occurred on February 28, 2018 and March 2, 2018.

https://ecology.wa.gov/public-hearing-presentation-wac-173-360;-173-360a

Repealed rule language (WAC 173-360; WAC 173-360A) 07/17/18

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

https://ecology.wa.gov/repealed-rule-language-wac-173-360;-wac-173-360a

Rulemaking Adoption Notice (WAC 173-360; WAC 173-360A) 07/17/18

This is the rulemaking adoption (CR-103) WAC 173-360; WAC 173-360A, Underground Storage Tank (UST) Regulations.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-360;-wac-173-3

Rulemaking Adoption Notice (WAC 173-360; WAC 173-360A) 07/18/2018

This is a rulemaking adoption (CR-103) for WAC 173-360A, Underground Storage Tank Regulations.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-360;-wac-1-1

Rulemaking Adoption Notice (WAC 173-340) 08/23/23

This is a rulemaking adoption (CR-103) for WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.

https://ecology.wa.gov/rulemaking-adoption-notice-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

Cleanup project: Clean Earth Burlington

Clean Earth/Burlington, located within the Port of Camas in Washougal, WA, is currently undergoing a formal dangerous waste cleanup process at their site. The company is publicly known as Clean Earth, legally named Burlington Environmental, and is a subsidiary of PSC Environmental Services.

https://ecology.wa.gov/cleanup-project-clean-earth-burlington

Cleanup site: Bay Zinc Co Inc

Cleanup site in Yakima county is the former location of zinc micronutrient fertilizer manufacturer, removing hazardous substances from the soil and groundwater.

https://ecology.wa.gov/bay-zinc-co-inc

Cleanup site: Boeing Auburn

Cleanup at the site of the Boeing fabrication facility in Auburn. Includes groundwater contaminated with a class of chemicals called “volatile organic compounds” (VOCs).

https://ecology.wa.gov/cleanup-site-boeing-auburn

Cleanup site: Boeing Auburn - documents

Documents for the Boeing cleanup site in Auburn, including general information, legal docs and maps.

https://ecology.wa.gov/cleanup-site-boeing-auburn-documents