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Regulations & Permits

Ecology oversees many state and federal laws designed to protect Washington's land, air, and water. Rules and regulations direct state agencies, local governments, businesses and others in how to comply with these laws. These rules and regulations are compiled in the Washington Administrative Code.

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Policies and guidance for site cleanups
Policies and guidance interpret the MTCA cleanup law and help you clean up contaminated sites.
If you spill oil or hazardous substances
Spills to water must be reported immediately to help reduce impacts to the environment.
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.
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.
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.
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.
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.
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.
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.
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.
Ecology's contained-in determination policy memo
Ecology's policy about contained-in determinations.
Tools for cleaning up petroleum contaminated sites
We have online tools and guidance to help you clean up petroleum-contaminated sites.
Underground storage tank closures
Important information about closing your underground storage tanks.
Sand & Gravel Permit guidance
Guidance to implement your Sand & Gravel General Permit.
Common cleanup situations for homeowners and small businesses
Learn about common cleanup situations likely to affect home and small business owners.
FAQ: Evaluate options to clean up homes and small businesses
These FAQs help homeowners and small businesses evaluate cleanup options and complete cleanup work.
FAQ: Investigate and report toxic releases
FAQs to help homeowners and small businesses investigate and report toxic releases.
Property inspection checklist
Before buying property, use the property inspection checklist to complete an onsite inspection.
Records search checklist
Before buying property, use the records search checklist for due diligence and to know past uses.
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.
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