Frequent Questions

How much water does a person ingest daily?

The estimated average per capita ingestion of water from a public water system in the United States is 927 milliliters per person per day. Ingestion estimates are important because EPA develops risk assessments based on the ingestion of contaminated drinking water. Currently, EPA uses the standard water ingestion quantity of two liters per day for a 70-kilogram adult when developing risk assessments (Estimated Per Capita Water Ingestion in the United States, EPA822-R-00-008, April 2000). The report on per capita water ingestion, based on data from the United States Department of Agriculture, and more information are available at
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