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.
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 site: Clean Earth LLC
Clean Earth LLC is a cleanup site at 20245 77th Ave S in Kent, formerly known as Stericycle Kent.
https://ecology.wa.gov/cleanup-site-clean-earth-llc
Online tool: All cleanup sites in Washington State
This is a searchable list of contamination cleanup sites in Washington state, including sites that have been cleaned up. It is part of the Cleanup and Tank Search application.
https://ecology.wa.gov/cleanup-and-tank-search-all-cleanup-sites-in-washington-state
Cleanup site: Bailer Hill Area PFAS
The Bailer Hill Area is a cleanup site on San Juan Island. Groundwater in the area is contaminated with PFAS.
https://ecology.wa.gov/cleanup-site-bailer-hill-area-pfas
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