330D
From My Cold Dead Hands
Well, enterprises that use a lot of water have to pay. Consumers do not.
I really don't know why we don't pay according to usage. How do they even know how much water someone uses? Maybe it would require modifications to the system and that would cost too much.
I have installed many a water line, including service lines into homes and businesses. There is a meter that spins an impeller which in turn clicks a little counter to measure the water usage. The meters have a readable (or scan-able) readout that tells usage, usually measured in thousands of gallons. The only way municipalities measure sewer usage is by the water measurement. They assume that every gallon in equals one gallon out. The meters are rather expensive, but simple to install. I think they cost around $400 USD (last I knew.)