California's Water Problem

For quite some time dual flush toilets are compulsory in all new homes in Australia.  I have visited the USA 10 times and have never once seen a dual flush toilet in America.  When you pee you don't need the same amount of water for the flush as when you poo.  Also in some areas of Australia we use recycled water to water our lawns and flush our toilets.  Australia is a very dry country so we have to manage our limited water resources very carefully.   In our coastal cities we have desalination plants to supplement the dam water supply but it is 3 times the price to operate.