Chorline dissapates after 24 hrs. just fill a bowl and let it sit if your so concerned.. What kind of chemicals are you concerned about if people drink it that you wouldn`t give you snake?
Fluoride, for one. Arsenic, Barium, and Selenium for others.
Radiation and bacteria are other concerns depending on where you live.
Then there are the bacteria and fertilizers.
Of course, I would never regularly drink tap water from certain places, and if I won't drink it the snakes won't drink it.
A report by the Environmental Working Group, called "Into the Mouths of Babes", found that of 29 mid western cities tested, all had at least one agricultural chemical present in a single glass of water, and most had five or more. These are chemicals that are not safe to ingest at the levels found.
EWG recommends not giving tap water to children if you live in cities that test positive for these contaminants.
Snakes are smaller than babies.
Brita filters and the like will not get rid of all these contaminants. You need to get reverse osmosis water, or distilled water with minerals added.
Spring water could be ok, depending on the source.
My city's public works department recommends bringing tap water to a roiling boil for one minute before drinking if you have a weakened immune system.