Sewage Treatment and Disposal Systems ORS 454.105 Definitions for ORS 454 Text Annotations As used in ORS 454.105 (Definitions for ORS 454) to 454.175 (Agreements with industrial establishment), unless the context requires otherwise: (1)“Disposal system” means that term as defined in ORS 468B.005 (Definitions for water pollution control laws). (2)“Municipality” means a city, county, county service district, sanitary authority or sanitary district. [Formerly 449.405]