The plant should be created, 1 km away from the community. So the plant can affect the smallest community because of water pollution, leading to diseases that affect humans and other living things.
Should build one kilometer away from the community. The plant has a minimal effect on the community because of water pollution led to the disease, which affects humans and other living things.
Should build a factory to stay away from the community 1 kilometers. To the factory affecting community because water pollution brings minimal disease which affects the University and other human creatures.