Murthi , Yes you can reuse ...

Murthi , Yes you can reuse the water for various other applications once treated depending on whether you have a water network in place one could use the water for the washing of clothes or for the flushing of toilet depending on the type of sanitation technologies used by the community if you are a rural community you can divert the water to a simple sand fliter and reuse the water for agriculture i would recommend using the water for toilet flushing or washing of clothes. Releasing untreated water into your stream is not good practice  for many reasons