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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Chapter 173-423 WAC – Clean Vehicles Program

This is the rulemaking page for Chapter 173-423 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-423

Chapter 173-350 WAC – Organics Management

This is the rulemaking page for Chapter 173-350 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-350

Chapter 173-339 WAC – Cosmetic Products Restrictions (Lead in Cosmetics)

This is the rulemaking page for Chapter 137-339 WAC (Lead in Cosmetics).

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-339-lead-in-cosmetics

Chapter 173-167 WAC – Emergency Drought Funding (2025)

On Dec. 5, 2025, Ecology adopted Chapter 173-167 WAC again.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-167-2025

Chapters 173-507, 173-508, 173-513, 173-514, and 173-515 WAC – Instream Resources Protection Program

This is the rulemaking page for Chapters 173-507, 173-508, 173-513, 173-514, and 173-515 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-507-508-513-514-515-watershed-restoration

Chapter 173-446 WAC – Cap-and-Invest Offsets (U.S. Forest Protocol)

This is the rulemaking page for Chapter 173-446 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-446-offsets-us-forest-protocol

Chapter 173-910 WAC - Mercury Lights Stewardship

Chapter 173-910 WAC – Mercury Lights Stewardship

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-910

Chapter 173-201A WAC – Harmful Algal Blooms

This is the rulemaking page for Chapter 173-201A WAC, Harmful algal blooms

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-201a-harmful-algal-blooms

Chapter 173-201A WAC – Lake Nutrient Criteria

This is the rulemaking webpage for Chapter 173-201A WAC Lake nutrient criteria.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-201a-lake-nutrient-criteria

Chapter 173-423 WAC – Clean Vehicles Program

This is the rulemaking page for Chapter 173-423 WAC, Washington’s Clean Vehicles Program rule.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-423-clean-vehicles-program

Chapters 173-425, 173-430, and 173-400 WAC – Flame Cap Kilns and Air Curtain Incinerators

This is the rulemaking page for Chapters 173-425, 173-430, and 173-400 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-425-430-400

Chapter 173-217 WAC – State Waters Alteration Permit

This is the rulemaking page for Chapter 173-217 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-217

Chapter 173-448 WAC – Air Quality in Overburdened Communities

This is the rulemaking page for Chapter 173-448 WAC, Air Quality in Overburdened Communities.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-448

Chapters 173-441 and 173-446 WAC – Cap-and-Invest Program Updates and Linkage

This is the rulemaking page for Chapters 173-441 and 173-446 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/rulemaking/wac-173-441-446-cap-and-invest-program-updates-and-linkage

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

Chapter 173-04 WAC

This is the rulemaking page for Chapter 173-04 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-04

Chapter 173-167 WAC Emergency Drought Funding (2021)

This is the emergency rulemaking page for Chapter 173-167 WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-167-2021

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/closed-rulemaking/wac-173-187

Chapter 173-201A WAC (Aquatic Life Toxics Criteria)

This is the rulemaking page for Chapter 173-201A WAC.

https://ecology.wa.gov/regulations-permits/laws-rules-rulemaking/closed-rulemaking/wac-173-201a-aquatic-life-toxics-criteria