Authorizes: (1) Counties to construct or authorize the construction and use of traditional sanitary sewer systems within and outside of urban growth areas; and

(2) Counties and cities to construct or authorize the construction and use of alternative on or off-site sanitary sewer systems or services within their jurisdictional boundaries.

Directs the state board of health and the department of ecology to promote the proper and effective use of nontraditional sewer systems and services.