In the 1970's I lived in ...

In the 1970's I lived in Livermore, California, which is somewhat arid.  As is often the case, there was a drought and water use was being restricted; could not water the grass or wash your car.

I set up a gray water system for my lawn and garden and used it for several months.  Since my lawn was very green, I had the pleasure of a government water company official pay me a visit accusing me of violating the restrictions.  I showed her my system which didn't impress her.  She stated that the wastewater facility depended on the gray water to dilute the black water solids and that I needed to stop my reuse.

I did stop watering the lawn, but did keep using it in my garden.

I have no such reuse needs here in Pennsylvania.