Which of the following is an example of a nonpoint source of freshwater pollution

Question

A. Pesticide runoff from farm fields
B. Leaking toxic waste landfill
C. Sewage treatment plant
D. Factory waste piped into a stream*

Answer 1

My answer is D

Answer 2

I disagree. The pipe entering the stream seems like a point source to me. There is one choice which is much harder to pin down to a specific location.