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.
Chapter 173-423 WAC<br>and WAC 173-400-025 – Low Emission Vehicles
This is the rulemaking page for Chapter 173-423 WAC and Chapter 173-400 WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-423-400
Chapters 173-423 and 173-400 WAC – Clean Vehicles Program
This is the rulemaking page for Chapter 173-423 WAC and Chapter 173-400 WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac173-423-400jan18
Chapters 173-424 and 173-455 WAC – Clean Fuels Program
This is the rulemaking page for Chapters 173-424 and 173-455 WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-424-455
Chapter 173-441 WAC – Reporting of Emissions of Greenhouse Gases
This is the rulemaking page for Chapter 173-441 WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-441
Chapters 173-422 and 173-422A WAC – Motor Vehicle Emission Inspection
This is the rulemaking page to repeal Chapters 173-422 and 173-422A WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-422-422a
Chapters 173-491, 173-400, 173-455 WAC – Emission Standards and Controls for Sources Emitting Gasoline Vapors
This rulemaking was withdrawn August 19, 2021 regarding WAC 173-491, WAC 173-400 and WAC 173-455.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-491-jul13
Chapter 173-455 WAC – Air Quality Fee Rule
This is the rulemaking page for Chapter 173-455 WAC.
https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-455
Grays Harbor terminal expansion environmental reviews
The current status of environmental reviews for two oil-related proposals in Grays Harbor.
https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-at-ecology/grays-harbor-terminal-expansion
Goldendale Energy Storage Project
Environmental review and permitting for the proposed Goldendale Energy Storage Project.
https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/goldendale-energy
Imperium expansion proposal
Imperium Terminal Services proposed expanding its existing transport facility in Hoquiam.
https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-at-ecology/grays-harbor-terminal-expansion/imperium-expansion-proposal
Determining if areas in Washington meet national air quality standards
We determine whether areas in Washington meet national air quality standards.
https://ecology.wa.gov/regulations-permits/plans-policies/areas-meeting-and-not-meeting-air-standards
TransAlta Power Plant
The TransAlta agreement lowers harmful air pollutants from Washington's only coal-fired power plant.
https://ecology.wa.gov/regulations-permits/compliance-enforcement/transalta
Washington's air quality implementation plan
The State Implementation Plan is an overarching plan to keep Washington's air clean.
https://ecology.wa.gov/regulations-permits/plans-policies/state-implementation-plans
Information for air monitoring professionals
Standard procedures, quality assurance, and monitoring guidance for air monitoring professionals.
https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/information-for-air-monitoring-professionals
Sulfur dioxide air quality designations
We’re deciding if parts of Washington don't meet national air quality standards for sulfur dioxide.
https://ecology.wa.gov/regulations-permits/plans-policies/areas-meeting-and-not-meeting-air-standards/sulfur-dioxide-designations
Attainment State Implementation Plans
Learn about Washington's plans to ensure communities meet national air quality standards.
https://ecology.wa.gov/regulations-permits/plans-policies/state-implementation-plans/attainment-sips
Annual air quality registration
Emission registration program for industrial air pollution.
https://ecology.wa.gov/regulations-permits/reporting-requirements/air-quality-emissions-reporting/air-quality-registration
Washington Emissions Inventory Reporting System (WEIRS)
Submit your emissions data via WEIRS.
https://ecology.wa.gov/regulations-permits/reporting-requirements/air-quality-emissions-reporting/emissions-inventory-reporting
Emissions reporting for small sources of air pollution
Learn how to submit your emissions data using the Source Management System (SMS).
https://ecology.wa.gov/regulations-permits/reporting-requirements/air-quality-emissions-reporting/small-source-emissions-inventory-reporting
Plans for maintaining air quality
View current plans to improve air quality and meet national air quality standards.
https://ecology.wa.gov/regulations-permits/plans-policies/state-implementation-plans/maintenance-sips
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