considerable agricultural, industrial or especially mining run off, be very careful. (Maybe be very afraid.) A fisheries guy warned me off of a couple small creeks within 15 minutes of home because of the coliform bacteria levels not too far away from sanitation facilities. While the bacteria may be different from the cholera which killed so many Americans in the 1800s and even today claims far too many lives in the world, I took his advice to collect and fish elsewhere.
Was chatting with a lady from Joliet yesterday (not from GL) who noted that the rising levels of lead, mercury and arsenic in their tap water had her very concerned. With the relaxing of water release rules for effluents under the current national US administration and the tolerance of new incinerators like the one in Robbins, IL, down wind lakes like the industrial Lake Calumet are now featuring a mercury level five times what it used to be. Naturally that drains into Lake Michigan a few miles from where millions of Chicago area people get their drinking water.
There are still lakes and streams in the US where I would lean over the side of a canoe and dip a tin cup and have a drink. Not nearly as many as in the past though.
Check with you local water people or water reclaimation district before pulling water for your aquaria. I hope I am unnecessarilly paranoid, but I don't know...
All the best!
unc;e
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