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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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Research & Data

Use this portal to filter and search for all of our scientific information.

Research & Data icon

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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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
Ecology's contained-in determination policy memo
Ecology's policy about contained-in determinations.
https://ecology.wa.gov/contained-in-determination-memo
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
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;
Preliminary Draft - Summary - UST Record Retention Periods (WAC 173-360; WAC 170-360A) 07/10/17
This table summarizes how long owners and operators of underground storage tank systems would need to retain records of various regulated activities under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/hold
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
Preliminary Draft - Part 10 (Financial Responsibility) (WAC 173-360; WAC 173-360A) 07/10/17
This document includes Part 10 (financial responsibility) of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/preliminary-draft-part-10-financial-responsibil
Preliminary Draft - Parts 1-9 (WAC 173-360; WAC 173-360A) 07/10/17
This document includes Parts 1 through 9 of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/preliminary-draft-parts-1-9-wac-173-360;-wac-17
Preliminary Draft - Summary - Certification for UST Services (WAC 173-360; WAC 173-360A) 07/10/17
This table identifies the underground storage tank system services requiring the use of a service provider and the certification that a service provider must have to perform those services under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/preliminary-draft-summary-cert-to-perform-ust
Preliminary Draft - Summary - O&M Compliance Dates (WAC 173-360; WAC 173-360A) 07/10/17
This table summarizes operation and maintenance compliance dates under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/preliminary-draft-summary-o-m-compliance-dates
Preliminary Draft - Summary - Deferred UST Compliance Dates (WAC 173-360; WAC 173-360A) 07/10/17
This table summarizes the dates by which owners and operators of previously deferred underground storage tank (UST) systems installed on or before the effective date of the UST rule would need to comply with the requirements of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/preliminary-draft-summary-prev-deferred-compli
Preproposal Statement of Inquiry (CR-101) (WAC 173-360; WAC 173-360A) 03/23/2016
This is a rulemaking announcement (CR-101) for WAC 173-360 Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/pre-proposal-statement-of-inquiry-cr-101-wac-17
Proposed language for new rule, Chapter 173-360A WAC, UST Regulations 01/24/18
This document contains proposed language for the new Underground Storage Tank Regulations, WAC 173-360A.
https://ecology.wa.gov/proposed-language-for-new-rule-chapter-173-360a-w
Rulemaking Proposal (WAC 173-360; WAC 170-360A) 01/24/18
This is a rulemaking proposal (CR-102) for WAC 173-360; WAC 173-360A, Underground Storage Tank (UST) Regulations.
https://ecology.wa.gov/rulemaking-proposal-wac-173-360;-wac-170-360a-01
Proposed repeal of existing rule, Chapter 173-360 WAC, UST Regulations 01/24/18
This document lists the chapters of the Washington Administrative Code that are proposed to be repealed.
https://ecology.wa.gov/rulemaking-proposed-language-wac-173-360a-01-24
Summary Table: Certification to Perform UST System Services (WAC 173-360; WAC 173-360A) 01/24/18
This table identifies the underground storage tank (UST) system services requiring use of a service provider and the certification that a service provider must have to perform those services under the proposed rule, Chapter 173-360A WAC.
https://ecology.wa.gov/summary-table-certification-to-perform-ust-system
Summary Table: Operation and Maintenance Compliance Dates (WAC 173-360; WAC 173-360A) 01/24/18
This table summarizes the dates by which owners and operators of underground storage tanks (UST) systems installed on or before the effective date of the proposed rule, Chapter 173-360A WAC, would need to comply with the new operation and maintenance requirements specified in Part 4 of the rule.
https://ecology.wa.gov/summary-table-operation-and-maintenance-complianc
Summary Table: Previously Deferred UST System Compliance Dates (WAC 173-360; WAC 173-360A) 01/24/18
This table summarizes the dates by which owners and operators of previously deferred underground storage tank (UST) systems installed on or before the effective date of the proposed rule, Chapter 173-360A WAC, would need to comply with the requirements of the rule.
https://ecology.wa.gov/summary-table-previously-deferred-ust-system-comp
Summary Table: UST System Record Retention Periods (WAC 173-360; WAC 173-360A) 01/24/18
This table summarizes how long owners and owners of underground storage tank (UST) systems would need to retain records of various regulated activities under the proposed rule, Chapter 173-360A WAC.
https://ecology.wa.gov/summary-table-ust-system-record-retention-periods
Text with Identified Changes to Current Rule (WAC 173-360; WAC 173-360A) 01/24/18
This document identifies changes to the current rule, WAC 173-360, Underground Storage Tank (UST) Regulations, that are included in WAC 173-360A.
https://ecology.wa.gov/text-with-identified-tracked-changes-to-prelimin
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