There are ways around that though; you could give a small rebate on the meter fee for low-use customers, to encourage conservation. (My water bill is that way,

There are ways around that though; you could give a small rebate on the meter fee for low-use customers, to encourage conservation. (My water bill is that way, the full meter charge is around $50/month, but if you use less than 700 Cubic-feet of water a month, the meter fee drops to $30/mo.) Is a little less pure than just charging a fair rate, but seems a reasonable hybrid approach.