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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Wood-fired hydronic heaters that meet Washington standards, May 13, 2025

This is the May 13, 2025 list of wood-fired hydronic heaters that meet Washington standards.

https://ecology.wa.gov/20250422hydronicheaters

H5 Data Center notice of construction (NOC) permit

This is the November 2024 air quality notice of construction permit (approval order) for H5 Data Center in Quincy.

https://ecology.wa.gov/20241126h5nocpermit

Microsoft Columbia Data Center notice of construction (NOC) application

This is the air quality notice of construction application for Microsoft Columbia Data Center in Quincy.

https://ecology.wa.gov/20241001mscolumbianocapp