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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Contamination cleanup
2011 MTCATPH Excel Spreadsheet's Troubleshooting Guide
Troubleshooting guide with operating tips for common installation problems associated with compatibility with MS EXCEL 2000, 2003, 2007, 2010 versions.
https://ecology.wa.gov/2011mtcatphtroubleshooting
Adopted Rule - Crosswalk with Repealed Rule and Federal Rule (WAC 173-360; WAC 173-360A) 07/17/18
This document provides a crosswalk between the provisions in the new Underground Storage Tank Rule and the provisions in both the repealed rule and the federal rule.
https://ecology.wa.gov/adopted-rule-crosswalk-with-repealed-rule-and-fede
Adopted Rule - Overview of Changes to Repealed Rule (WAC 173-360; WAC 173-360A) 07/17/18
This document provides a summary of changes to the repealed chapter, WAC 173-360. Changes highlighted grey were made to be consistent with federal rule requirements in 40 C.F.R. Part 280 or to comply with state program approval (SPA) requirements in 40 C.F.R. Part 281.
https://ecology.wa.gov/adopted-rule-overview-of-changes-to-repealed-rule
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
Adopted Rule - Summary - Certification for UST Services (WAC 173-360; WAC 173-360A) 07/17/18
This table identifies the underground storage tank system services requiring use of a service provider and the certification that a service provider must have to perform those services under the new rule, Chapter 173-360A WAC.
https://ecology.wa.gov/adopted-rule-summary-table-certification-to-perfor
Adopted Rule - Summary - O&M Compliance Dates (WAC 173-360; WAC 173-360A) 07/17/18
This table summarizes the dates by which owners and operators of underground storage tanks systems installed on or before the effective date of the new rule, Chapter 173-360A WAC, need to comply with the new operation and maintenance requirements.
https://ecology.wa.gov/adopted-rule-summary-table-operation-and-maintenan
Adopted Rule - Summary - Deferred UST Compliance Dates (WAC 173-360; WAC 173-360A) 07/17/18
This table summarizes the dates by which owners and operators of previously deferred underground storage tank systems installed on or before the effective date of the new rule, Chapter 173-360A WAC, need to comply with the requirements of the rule.
https://ecology.wa.gov/adopted-rule-summary-table-previously-deferred-ust
Adopted Rule - Summary - Record Retention Periods (WAC 173-360; WAC 173-360A) 07/17/18
This table summarizes how long owners and operators of underground storage tank systems need to retain records of various regulated activities under the new rule, Chapter 173-360A WAC.
https://ecology.wa.gov/adopted-rule-summary-table-record-retention-period
Adopted Rule - Text with Identified Changes to Repealed Rule (WAC 173-360; WAC 173-360A) 07/17/18
This document identifies the differences between the new rule (Chapter 173-360A) and the repealed rule (Chapter 173-360). The changes are identified in the footnotes. This document also provides a crosswalk between the provisions in the new rule and the provisions in both the repealed rule and the federal rule.
https://ecology.wa.gov/adopted-rule-text-with-identified-changes-to-repea
Adopted Rule - Text with Tracked Changes to Proposed Rule (WAC 173-360; WAC 173-360A) 07/17/18
There are some differences between the proposed Underground Storage Tank rule filed on January 24, 2018, and the adopted rule filed on July 18, 2018. This document identifies all of the changes Ecology made to the text of the proposed rule, including all deletions and additions.
https://ecology.wa.gov/adopted-rule-text-with-tracked-changes-to-proposed
Adopted rule language (WAC 173-360; WAC 173-360A) 07/17/18
This is the adopted rule language for WAC 173-360; WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/adopted-rule-language-wac-173-360;-wac-173-360a
Adopted rule language (WAC 173-340) 08/23/23
This is adopted rule language for WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.
https://ecology.wa.gov/adopted-rule-language-wac-173-340-08-23-23
Adopted Rule Text with Tracked and Footnoted Changes to Current Rule (WAC 173-340) 08/23/23
This document tracks and footnotes adopted changes to current WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.
https://ecology.wa.gov/adopted-rule-text-with-tracked-and-footnoted-changes-to-current-rule-wac-173-340-08-23-23
Adopted Rule Text with Tracked Changes to Proposed Rule (WAC 173-340) 08/23/23
This document tracks adopted changes to proposed WAC 173-340, Model Toxics Control Act (MTCA) Cleanup Regulations.
https://ecology.wa.gov/adopted-rule-text-with-tracked-changes-to-proposed-rule-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
2021 Brownfield Redevelopment Trust Fund Account report
A legislative report in response to requirements of Washington's environmental cleanup law, the Model Toxics Control Act.
https://ecology.wa.gov/2021-brownfield-redevelopment-trust-fund-account-legislative-report
2023 PPG Awards
This is Ecology's list of 2023 – 2025 Public Participation Grants awards.
https://ecology.wa.gov/2023-awards
2019 Brownfield Redevelopment Trust Fund Account
Ecology's 2019 report to the legislature on redevelopment activities funded by the Brownfield Redevelopment Trust Fund (BRTF) Account.
https://ecology.wa.gov/2019-brownfield-redevelopment-trust-fund-account-legislative-report
2023 Brownfield Redevelopment Trust Fund Account
Report to the legislature on activities funded by the Brownfield Redevelopment Trust Fund Account.
https://ecology.wa.gov/2023-brownfield-redevelopment-trust-fund-account-legislative-report
Aladdin Plating
We monitor groundwater for legacy plating chemicals at the former Aladdin Plating Co. site in Tacoma.
https://ecology.wa.gov/research-data/monitoring-assessment/groundwater-quality-assessment/active-studies-index/aladdin-plating
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