Short answer = 1,000 liters
Long answer. The density of water varies somewhat depending on the temperature and the inclusion of any impurities. But for say, tap water, 1000 liters is 1 tonne. Yes, that is tonne with an 'e' - a metric tonne. 1 liter of water is 1kg, 1,000 liters is 1000kg (1 metric tonne) = 2205 pounds = 1.1ton (short, imperial ton).
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