Sewage reuse schemes are widespread particularly in larger cities. Class C which is filtered then disinfected with chlorine then UV sterilised is often used on golf courses and gardens; class A uses reverse osmosis and is drinkable, but is expensive and used in desert areas. But not all metals and organic molecules are removed. https://en.wikipedia.org/wiki/Reclaimed_water
Sewage reuse schemes are widespread particularly in larger cities. Class C which is filtered then disinfected with chlorine then UV sterilised is often used on golf courses and gardens; class A uses reverse osmosis and is drinkable, but is expensive and used in desert areas. But not all metals and organic molecules are removed. https://en.wikipedia.org/wiki/Reclaimed_water