Wash. Admin. Code § 197-11-050 : Ecology, Department of (Environmental Policy, Council on) —11 - SEPA rules — GENERAL REQUIREMENTS —11-050 - Lead agency
(1) A lead agency shall be designated when an agency is developing or is presented with a proposal, following the rules beginning at WAC
197-11-922.
(2) The lead agency shall be the agency with main responsibility for complying with SEPA's procedural requirements and shall be the only agency responsible for:
(a) The threshold determination; and
(b) Preparation and content of environmental impact statements.