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For us, more than 25 litres - we live on the north east coast so need to spend more time washing and rinsing than when we work inland. So water usage will depend on your round and where it is. Doing street houses next to a main road we will use more water than the ones behind because of grim deposited by passing traffic.I would say you need about of 25 litres per standard house. Some more, some less.