F, she, she, the next year, F, F, her day, Yancheng City, our province, because the raw water of Chengxi Waterworks was polluted by phenolic compounds, at least F, her 10,000 residents were affected.

F, she, she, the next year, F, F, her day, Yancheng City, our province, because the raw water of Chengxi Waterworks was polluted by phenolic compounds, at least F, her 10,000 residents were affected. "Protect the safety of drinking water. 5. Pure water lacks essential minerals and trace elements, and long-term drinking is harmful to human health, so the option is incorrectly stated.

B, copper sulfate is a kind of heavy metal salt, which is toxic to human body and cannot be used for disinfection of drinking water in waterworks, so the option is incorrectly stated.

C, sewage can be reused after treatment, so the option is wrong.

D, to ensure that the water source is not polluted is the guarantee of drinking water safety and maintaining life and health, so the option is expressed correctly.

So choose D.