the little water that I "waste" dilutes some of
the real waste water that is in the system so it does serve
a purpose.

if you have city sewers, the water-treatment-plant operators would
tell you a different story. The more water becoming septic, the higher
everyone's taxes will be.

In other fora is discussed the fact that, it not only is cost-effective
to keep water away from human excrement, but it's actually
cost-effective to keep urine separated from #2, right from the git-go.