Oregon Revised Statutes Public Health and Safety § 446.345

(1) Use kitchen or toilet facilities in a camping vehicle being operated on a highway or parked overnight at a place where sanitary facilities are not provided unless the person makes provision whereby sewage and other waste materials can be held in watertight and sanitary containers of a type approved by the Oregon Health Authority.

(2) Empty a container described in subsection (1) of this section except into a public sewerage system, septic tank or cesspool of a type approved by the authority. However, in isolated areas where space is not available in a recreation park or organizational camp and such facilities are not available, these containers may be emptied into the ground if all sewage and other waste materials are buried at least one foot below the surface of the ground.

(3) When using a recreation park or organizational camp, create an insanitary condition or deposit putrescible or nonputrescible waste any place other than in appropriate containers designated for such purposes.