I'm trying to understand how to identify a stream as a mikveh. Clearly the stream has to flow. But what sources of the stream are permitted: drainage basin (a.k.a watershed), aquifer, and others?

  • You can get few informations here – kouty May 30 '16 at 21:11
  • Mikveh for nidda or kelim or for tevilat Ezra? – kouty May 30 '16 at 21:29
  • 1
    general purpose – eternalsquire May 30 '16 at 23:21
  • "Clearly the stream has to flow." Why is that clear? – Double AA May 31 '16 at 3:44
  • From previous answers, a spring has to be 'living water', from a spring. If its not running, then it's a lake, which is not valid, right? – eternalsquire May 31 '16 at 4:52

See Kitzur Shulchan Aruch 162:12.

The source of a Mikvah of flowing water must be a spring. Rainwater is only kosher for a mikvah when it is standing still. (The halacha discusses a mixture of the two).

Therefore, if the source of the flowing water is only rain or melted snow, it would not be good for a mikvah. It it was a mixture of spring water and rain/melted snow, it would only be acceptable in extreme circumstances, as detailed in that Halacha.

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