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So, apparently if you let tap water sit for a few days the chlorine will evaporate off but how can one safely expose the water to the the air without risk of infection from airborne particles?

  • Obviously you don't want to let it sit until the frogs make their home in your pot. For brewing, airborne wild yeasts and bacteria do not matter cause you boil later anyway. Also your yeast should be the strongest culture in the fermenter, overpowering any other wild yeast and bacteria that made it into the fermenter. – Robert May 18 '18 at 21:58
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Chlorine you can boil off before use, usually a hard boil for 20 minutes will get rid of Chlorine. Unless your water district uses a binder which is rare.

Chloramine cannot be boiled off and needs to be chemically stripped. Campden tablets do well.

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Letting the water sit to let the chlorine evaporate will not make a difference when it comes time to brew. Once the wort starts to boil, it will kill anything that got in there.

So you don't have to wait overnight for the chlorine to leave, just boil your water for about 20 minutes. If you don't even want to wait that long, just dissolve a campden tablet in your water before you start to use it. This will strip all the chlorine related chemicals.

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