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.
Policies and guidance for site cleanups
Policies and guidance interpret the MTCA cleanup law and help you clean up contaminated sites.
https://ecology.wa.gov/regulations-permits/plans-policies/toxics-cleanup-policies
What to do if you spill oil or hazardous substances
Spills to water must be reported immediately to help reduce impacts to the environment.
https://ecology.wa.gov/regulations-permits/reporting-requirements/spills-if-you-spill
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
Common cleanup situations for homeowners and small businesses
Learn about common cleanup situations likely to affect home and small business owners.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/guidance-for-residential-cleanups/common-cleanup-situations-for-homeowners-small-b
FAQ: Evaluate options to clean up homes and small businesses
These FAQs help homeowners and small businesses evaluate cleanup options and complete cleanup work.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/guidance-for-residential-cleanups/evaluation-cleanup-for-homeowners-small-busine
FAQ: Investigate and report toxic releases
FAQs to help homeowners and small businesses investigate and report toxic releases.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/guidance-for-residential-cleanups/investigating-reporting-toxic-releases
Underground storage tank closures
Important information about closing your underground storage tanks.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/ust-owner-and-operator-resources/underground-storage-tank-closures
Property inspection checklist
Before buying property, use the property inspection checklist to complete an onsite inspection.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/guidance-for-residential-cleanups/property-inspection-checklist
Records search checklist
Before buying property, use the records search checklist for due diligence and to know past uses.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/guidance-for-residential-cleanups/records-search-checklist
Chapter 173-185 WAC
This is the rulemaking page for chapter 173-185 WAC, Oil Movement by Rail and Pipeline Notification.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-185
Chapter 173-187 WAC
This is the rulemaking page for 173-187 WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-187
Tools for cleaning up petroleum contaminated sites
We have online tools and guidance to help you clean up petroleum-contaminated sites.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/clean-up-petroleum-contamination
Sand & Gravel Permit guidance
Guidance to implement your Sand & Gravel General Permit.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/stormwater-permittee-guidance-resources/sand-and-gravel-permit-guidance
CLARC data tables and other technical information
Download CLARC data tables for information that helps site managers determine cleanup levels.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-clean-up-tools/clarc/data-tables
History of changes to CLARC
Read about major changes to the Cleanup Levels and Risk Calculation (CLARC) spreadsheet since 2004.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-clean-up-tools/clarc/latest-news
CLARC glossary
A glossary for terms and acronyms in CLARC's resource pages.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-clean-up-tools/clarc/glossary
Chapter 173-360A WAC
This is the rulemaking page for Chapter 173-360A WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-360a
Cleanup Levels and Risk Calculation (CLARC)
CLARC's resources help you set contaminated site cleanup levels that comply with Washington law.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-clean-up-tools/clarc
CLARC guidance
Use these guidance documents in combination with CLARC to establish cleanup levels.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/contamination-clean-up-tools/clarc/guidance
Requirements for submitting cleanup site data
You must submit your lab data electronically through EIM.
https://ecology.wa.gov/regulations-permits/reporting-requirements/data-submittal-requirements-for-cleanup-sites
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