Surely there would have to be different bands, as some use much more than others that would cause the water board alot of hassle, if on a meter the quantity of water you use is payed for anyway.But if theres a drought i do really think WFP should be part of a hose pipe ban if it isn't already.
Im in the process of setting up a WFP backpack to do hard to reach windows so i will be using alot less water than a full time WFP w/c.