 In 2010, 66% of all U.S. residents and 74% of U.S. residents with access to community water systems receive fluoridated water.In 2010, a U.S. Centers for Disease Control and Prevention study determined that "40.7% of adolescents aged 12–15 had dental fluorosis [in 1999–2004]".In response, in 2011 the U.S. Department of Health and Human Services and the U.S. Environmental Protection Agency (EPA) proposed to reduce the recommended level of fluoride in drinking water to the lowest end of the current range, 0.7 milligrams per liter of water (mg/L), from the previous recommended maximum of 0.7 to 1.2 mg/L in recognition of the increase in sources of fluoride such as fluoridated toothpastes and mouthwashes.