Oregon Revised Statutes Public Health and Safety § 446.340

(1) The owner or operator of a recreation park or organizational camp is responsible for the sanitary condition of the park grounds and buildings.

(2) If sanitary facilities are not provided in a recreation park or organizational camp for the safe disposal of sewage or other wastes from a camping vehicle, a notice shall be posted in a conspicuous place stating that camping vehicles are permitted overnight only if the vehicle's waste holding tanks are used.

(3) Notwithstanding ORS 446.330, the Oregon Health Authority shall not require an owner or operator of a recreation park or organizational camp to provide both toilets and dumping stations.