Municipal sewage treatment plants are very effective at breaking down human waste prior to discharging the wastewater into rivers.  Why then, do so many U.S. plants continue to cause water quality problems in rivers?

A. all of the answers listed here.
B. plants are not very effective at removing hazardous chemicals.
C. plants are not very effective at removing heavy metals.
D. combined sewage and stormwater systems release raw sewage during large rain events.
E. plants are not very effective at removing pharmaceuticals.


Answer: A

Environmental & Atmospheric Sciences

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