According to the NPDES permits for the Potlatch Mill in Lewiston that I received from the EPA's Region 10 office in Seattle, the mill's main pollutant is heat. The mill uses water from the Snake River to cool machinery and pumps that warm water back into the river, possibly disturbing freshwater fish.
This sparked my interest because sources throughout the semester have said the mill operators decided to just pay the fines rather than modify the plant. These effluent discharge levels have been a source of contention for environmentalists for many years so I would like to see if state and federal fines are too low to make any real difference.
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