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.

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UST COVID-19 Stakeholder letter, March 27, 2020

This letter is to inform you of the Government Public Health and Safety Restrictions in regards to implementation of the Underground Storage Tank requirements (UST) imposed by coronavirus (COVID-19).

https://ecology.wa.gov/ust-covid-19-stakeholder-letter-march-27-2020

Vapor Intrusion for TCE

EPA's Region 9 memo Vapor Intrusion response action levels

https://ecology.wa.gov/vi-tce-region-9-memo

UST Service Provider list

List of approved underground storage tank service providers with contact and service-area information

https://ecology.wa.gov/ustserviceproviders

Vapor Intrusion guidance for TCE

EPA's Region 10 memo Vapor Intrusion toxicity

https://ecology.wa.gov/vi-tce-region-10-memo

Electronically completing and signing VCP documents

How to complete and sign VCP documents electronically. These are temporary instructions to be used during the Governor's Stay Home - Stay Healthy proclamation period.

https://ecology.wa.gov/vcp-electronic-signatures

Voluntary Cleanup Program cleanup opinions flow chart description

This document describes the flow chart on our Voluntary Cleanup Program types of opinions we issue page.

https://ecology.wa.gov/vcpopinionsflowchartalttext

Notice to withdraw from the Voluntary Cleanup Program

This document is a form letter to complete and submit when withdrawing from the Voluntary Cleanup Program.

https://ecology.wa.gov/vcp-withdrawalnotice

Draft UST Service Provider list

This is a draft list of certified underground service tanks service providers.

https://ecology.wa.gov/ust-service-provider-list-10-01-17

MTCASGL12.0: Excel workbook for individual hazardous substances

Statistical workbook for calculating cleanup levels for individual hazardous substances for sites being cleaned up under the Model Toxics Control Act.

https://ecology.wa.gov/workbook-for-calculating-cleanup-levels-for-indivi

Northeast West Plains PFAS in drinking water sampling area map

West Plains Sampling Map

https://ecology.wa.gov/west-plains-pfas-sampling-area-map

Underground Storage Tank information for new owners and new installations

Information for new Underground Storage Tank (UST) owners and installation of new tanks.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/ust-owner-and-operator-resources/new-owner-new-tank

Underground storage tank service providers

Information for underground storage tank (UST) service providers and for those looking to find one.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/ust-owner-and-operator-resources/service-providers

Approved sampling and analysis procedures

Approved laboratory analysis methods for cleaning up contaminated sites.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-cleanup-tools/sampling-and-analysis-procedures

Chapter 173-340 WAC

This is the rulemaking page for Chapter 173-340 WAC, Model Toxics Control Act Cleanup Regulations.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-340

Tools for cleaning up contaminated sites

We have online tools and statistical packages to help you clean up contaminated sites.

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

Empirical demonstrations under MTCA

Empirical demonstrations can show that applicable groundwater cleanup levels aren’t being exceeded.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/empirical-demonstrations-mtca

Online cleanup guide for homeowners and small businesses

An online cleanup guide for homes and small business properties that might be contaminated.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/guidance-for-residential-cleanups

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

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

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