Amish farm isn't connected to municipal water. Sources: well (hand pump or windmill), creek (if lucky with the land), rain barrel (for garden).
Usage
Average American: 300 liters/day. Amish family (8 people): 200 liters/day for all. 25 liters per person. 12x less. How? No washing machine (laundry once a week, by hand). No dishwasher. Shower — bucket of warm water. Toilet — outhouse.