The Areawide 208 Plan, adopted pursuant to the Federal Water Pollution Control Act of 1972, P.L. 92-500, as amended, and any sewer implementation plan approved by the Environmental Quality Commission under ORS 454.275 to 454.380 shall be the governing master plan for the provision of sewage collection, treatment and disposal services by municipalities in an affected area. Any substantial amendment to such plan shall be submitted to and approved by the commission before taking effect.
ORS 454.360