Regulations & Permits

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

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

See more about this collection...

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

Occidental Storymap Plain Text Accessible

Plain text accessible PDF of the Occidental storymap

https://ecology.wa.gov/occidental-storymap-plain-text

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;

Emerald Kalama and Fire Mountain Farms Hazardous Waste Petitions Fact Sheet

Decision to approve hazardous waste delisting and treatment variance petitions

https://ecology.wa.gov/hazardous-waste-petition-fact-sheet

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

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

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

Acronyms & glossary for the Toxics Cleanup Program

We have a list of acronyms and terms commonly used in contaminated site cleanup work.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/toxic-cleanup-acronyms

Using the EIM Data Analysis Tool

The EIM Data Analysis Tool (EDAT) compares data from Ecology's EIM database to cleanup criteria.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-cleanup-tools/eim-data-analysis-tool

Leaking underground storage tanks

Cleanup resources for underground storage tanks that have leaked petroleum products into the ground.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/leaking-underground-storage-tanks

Vapor intrusion

We have guidance that helps you evaluate and respond to vapor intrusion at your MTCA cleanup site.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/vapor-intrusion-overview