Wash. Rev. Code § 70.05.160
A local board of health that adopts a moratorium affecting water hookups, sewer hookups, or septic systems without holding a public hearing on the proposed moratorium, shall hold a public hearing on the adopted moratorium within at least sixty days of its adoption. If the board does not adopt findings of fact justifying its action before this hearing, then the board shall do so immediately after this public hearing. A moratorium adopted under this section may be effective for not longer than six months, but may be effective for up to one year if a work plan is developed for related studies providing for such a longer period. A moratorium may be renewed for one or more six-month periods if a subsequent public hearing is held and findings of fact are made prior to each renewal.
RCW 70.05.160