The federal study conducted, between 2007 and 2009, analyzed blood and urine samples for indicators of more than 80 environmental contaminants and chemical substances.
Those surveyed had a mean concentration of 1.16 micrograms of BPA per litre in their urine.
The study also revealed that concentrations of BPA in urine were higher for children aged 6 to 11 than they were for adults aged 40 to 79. The highest concentrations were identified in teenage children.
Some scientists argue that BPA damages human health – adversely effecting the reproductive and nervous systems.
But supporters of BPA claim that the chemical is safe to use in food and beverage packaging.