I'm not sure it gives us a clear picture of the extent of any damage being done to the environment, but this is an interesting story about whisky industry "waste".
http://www.sundayherald.com/52436
I recall vaguely that there was a similar debate 'way back in the 19th century, when local landowners complained that effluent discharged from Highland distilleries was killing off their salmon. No doubt someone will be able to provide a reference to it in one of the whisky history books.
And I'm sure there was a pollution scare a few years back at Girvan, caused by an accidental discharge of effluent into the sea from the grain distillery there?

