In the past, American cities emptied their sewage into rivers and other bodies of water. This caused the bodies of water to be polluted and filled with microorganisms that could cause human diseases. Today, people understand how bad it is for the environment to dispose of raw sewage in rivers, lakes, and bays. How do most American cities now protect their water resources?

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14 February, 00:58

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Guillermo Lin · Answer 1

I think they remove trash and other things from the water and filter the rest of the water to use or return