what???? you are charged for storing your own water??? that's just criminal!
so it's that simple? i thought it would be more involved due to all the crap (including bird poo) being washed from the roof and the gutters. Or does he have some sort of filtration system? Wouldn't he get a lot of sediment (especially after all the dust storms we've had)? Also doesn't standing water go putrid after a while???
I'm not criticising, just asking as I have absolutely no idea about tank systems...

Sasa