This final environmental impact statement addresses the social, economic, and natural environmental impacts potentially resulting from implementation of the proposed comprehensive wastewater treatment facilities presented in the Wastewater Facilities Plan for Greene County, prepared concurrently with this document. The Greene County planning area for these studies was divided into subareas, including the City of Springfield, six outlying communities, and the remaining unincorporated area. Impacts of the recommended alternatives were generally found to be beneficial, particularly to surface and ground water quality and efficient land use planning. Mitigative measures are required to reduce adverse environmental impacts, including damage to riparian habitat and archaeological resources, potential problems in sink-hole, losing stream, and landfill areas, stream sedimentation, and erosion. Cost impacts to residents in presently unsewered areas will be great, despite efforts to reduce them.