A few years ago when Sydney was suffering from a water pollution scare, I wrote this song. Thankfully, I only sang it once:
(to the tune of "Home on the range")

Oh give me a home, where giardia roam.
And the cryptosporidium play.
If you drink water here, you will get diarrhoea
And you'll sit on the dunny all day.

(chorus)
Oh we want a change
from the germs we are drinking today
Sydney water's a bore, we won't drink any more
Till they take all those nasties away.