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What percentage of water used in a house is flushed down the toilet?

Answer:
  • In the US approximately 40% of all domestic water consumed is flushed down the toilet.
  • an old-style single flush toilet can use up to 5.5 gallons (20 liters) of water in one flush, whereas more water efficient dual flush toilets average less than 1 gallon (4 liters)
  • replacing a traditional single flush toilet with a water efficient dual flush toilet saves about 21 gallons (80 liters) per person per day.
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