Deserts are dry on average, but some parts are quite wet :-) FWIW, Las Vegas water rates are lower than the average US city. That could be because the cost is

Deserts are dry on average, but some parts are quite wet :-) FWIW, Las Vegas water rates are lower than the average US city. That could be because the cost is subsidised by gambling and perhaps it doesn't includes the cost of say building Hoover Dam. But also the infrastructure is more modern than the typical US city. For comparison, Atlanta's water rates are MUCH higher than Las Vegas despite it having 10 times the annual rainfall.