You do all the time....After a little rehab in a sewage treatment plant.
Yes, I point out to customers all the time that all sewage water runs into the reservoirs after it goes through a primary plant and is “nuked” with chlorine.
I also point out during a summer dry spell where do they think most of the make-up water entering the reservoirs comes from?
The area where I live is the watershed (reservoirs) for NYC and also many suburban towns on the way down there.