​SEPA Frequently Asked Questions

We manage the State Environmental Policy Act (SEPA) on behalf of local governments and state agencies in Washington. This summary is designed to answer frequently asked questions about SEPA.

General Questions
Categorical Exemptions
Lead Agency
Threshold Determination Process
Determination of Nonsignificance
Environmental Impact Statements
Adopting and Revising Existing Documents
Substantive Authority
Nonproject Review