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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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

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

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

Rulemaking Adoption Notice (WAC 173-360A) 09/--/23

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

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-360a-09-23

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